Details of the Researcher

PHOTO

Chieko Kuji
Section
Graduate School of Engineering
Job title
Assistant Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

e-Rad No.
20839287
Researcher ID
GBR-3007-2022
Profile

地球環境にやさしく、人々の生活を豊かにするものづくり（サステナブルものづくり）を目指し、材料のあらゆる特性を活用した新たな加工技術を開発しています。

・超省エネモータコア実現に向けたアモルファス合金の新たな打ち抜き加工法の開発

・温度選択性を有する放熱表面の創成

・超高齢社会のQOLを豊かにする新たな歯科治療法の開発

 

★New★

中高生向けの研究紹介記事を執筆しましたので、ご興味のある方はご覧ください。

・加工が難しい省エネ材料「アモルファス合金」の加工法を開発

https://miraibook.jp/researcher/k25342

Research History 5

  • 2024/04 - Present
    Osaka University

  • 2024/04 - Present
    Tohoku University　Graduate School of Engineering Department of Mechanical Systems Engineering　Assistant Professor

  • 2022/04 - 2024/03
    Tohoku University　Graduate School of Engineering Department of Finemechanics　Assistant Professor

  • 2018/09 - 2022/03
    Iwate industry promotion center

  • 2016/04 - 2018/08
    FUJIFILM Corporation

Education 3

  • Tohoku University　Graduate School of Engineering　Department of Mechanical Systems Engineering

    2019/04 - 2022/03

  • Tohoku University　Graduate School of Engineering

    2014/04 - 2016/03

  • Tohoku University　Faculty of Engineering　Department of Mechanical and Aerospace Engineering

    2010/04 - 2014/03

Committee Memberships 8

  • 砥粒加工学会 会誌編集委員会　委員

    2025/04 - Present

  • 砥粒加工学会 次世代ものづくり技術研究会　運営委員

    2024/04 - Present

  • 日本機械学会 RC302「人間の感性を活用したDX 時代の生産技術に関する研究分科会」　研究協力委員

    2024/04 - Present

  • 精密加工研究会　実行委員

    2023/04 - Present

  • 精密工学会　ナノ精度機械加工専門委員会 委員

    2022/04 - Present

  • 砥粒加工学会　2025年度 論文査読委員

    2025/06 - 2026/03

  • 日本機械学会 RC295「持続可能社会を実現するDX時代の生産技術に関する研究分科会」　研究協力委員

    2023/09 - 2024/03

  • 公益社団法人日本材料学会　疲労部門委員会

    2022/05 - 2024/03

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Professional Memberships 3

  • 公益社団法人砥粒加工学会

    2023/01 - Present

  • 公益社団法人日本材料学会

    2022/04 - Present

  • The Japan Society of Mechanical Engineers

    2021/11 - Present

Research Interests 7

  • サステナブルものづくり

  • Powder Jet Machining

  • Mechanical machining

  • Surface texturing

  • Ultra short pulsed laser

  • Microstructure control

  • Amorphous alloy

Research Areas 3

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Manufacturing and production engineering /

  • Nanotechnology/Materials / Metallic materials /

  • Nanotechnology/Materials / Material fabrication and microstructure control /

Awards 14

  1. 令和6年度日本材料学会学術奨励賞

    2025/05　公益財団法人日本材料学会　アモルファス合金の機械的特性の微細組織依存性解明と加工への応用展開

  2. 第41回（2024年度）井上研究奨励賞

    2025/02　公益財団法人井上科学振興財団　局在微細組織制御を援用したアモルファス合金の加工性向上に関する研究

  3. 第30回青葉工学研究奨励賞

    2024/12　一般財団法人青葉工学振興会　アモルファス合金の準安定性を活用した加工手法の開発

  4. The 20th International Machine Tool Engineers' Conference (IMEC2024) Best Poster Award

    2024/11　Japan Machine Tool Builder's Association　Development of Innovative Machining Method by Microstructure Control of Amorphous Alloys

  5. ICPE2024 Best Paper Award

    2024/10　Japan Society for Precision Engineering (JSPE)　Notch effect in blanking of local heating with ultrashort pulsed laser for Fe-based amorphous alloys and its influence on soft magnetic properties

  6. 砥粒加工学会奨励賞

    2024/08　公益社団法人砥粒加工学会　パウダージェットデポジションの付着現象ダイナミクス解明と新しい歯科治療への応用展開

  7. マザック高度生産システム優秀論文賞

    2024/05　公益財団法人マザック財団　Fabrication of temperature-selective thermal radiation surfaces utilizing surface texturing

  8. 第23回インテリジェント・コスモス奨励賞

    2024/05　公益財団法人インテリジェント・コスモス学術振興財団　アモルファス合金の熱的微細組織変化と局所機械的特性の解明による加工性向上への応用

  9. 日本機械学会奨励賞（研究）

    2024/04　一般社団法人日本機械学会　局所微細組織制御によるアモルファス合金の加工性向上の研究

  10. Best Paper Award

    2023/09　3rd International Conference on Advanced Surface Enhancement (INCASE 2023)　Blanked Surface Characteristics of Amorphous Alloys with Local Microstructure Modification by Ultrashort Pulsed Laser

  11. 優秀講演表彰

    2022/10　一般社団法人 日本機械学会 材料力学部門　X線回折法による2次元検出器を用いたアモルファス合金の局所結晶化調査

  12. The 16th China-Japan International Conference on Ultra-Precision Machining Process 2022(CJUMP2022) BEST PAPER AWARD

    2022/03　CJUMP COMMITTEE　Effect of heat treatment on blanking of Fe-Si-B-Cr amorphous alloys

  13. 第39次工作機械技術振興賞・論文賞

    2018/06　公益財団法人工作機械技術振興財団　パウダージェットデポジション(PJD)における粒子粉砕挙動と成膜メカニズムに関する研究

  14. 平成29年度 砥粒加工学会賞論文賞

    2018/03　公益社団法人 砥粒加工学会　パウダージェットデポジション（PJD）における粒子破砕挙動と成膜メカニズムに関する研究

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Papers 23

  1. Clarification of shear deformation behavior in Fe–Si amorphous alloys by molecular dynamics International-journal Peer-reviewed

    Chieko Kuji, Narumasa Miyazaki, Masayoshi Mizutani, Keita Shimada, Nobuki Ozawa, Momoji Kubo, Tsunemoto Kuriyagawa

    Materials & Design　249　113566-113566　2025/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.matdes.2024.113566 　

    ISSN： 0264-1275

  2. Acid resistance of hydroxyapatite dental films fabricated through powder jet deposition International-journal Peer-reviewed

    Chieko Kuji, Kuniyuki Izumita, Keita Shimada, Masayoshi Mizutani, Keiichi Sasaki, Tsunemoto Kuriyagawa

    Materials Today Communications　40　109564-109564　2024/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.mtcomm.2024.109564 　

    ISSN： 2352-4928

  3. Fluid/Material Coupled Numerical Simulation of a Bubble Collapse Near a Wall for Laser Cavitation Peening International-journal Peer-reviewed

    Yuka Iga, Chieko Kuji, Hirotoshi Sasaki, Hitoshi Soyama

    Proceedings of the 3rd International Conference on Advanced Surface Enhancement (INCASE) 2023, Lecture Notes in Mechanical Engineering　309-314　2024/05/07

    Publisher: Springer Nature Singapore

    DOI： 10.1007/978-981-99-8643-9_37 　

    ISSN： 2195-4356

    eISSN： 2195-4364

  4. Blanked Surface Characteristics of Amorphous Alloys with Local Microstructure Modification by Ultrashort Pulsed Laser International-journal Peer-reviewed

    Chieko Kuji

    Proceedings of the 3rd International Conference on Advanced Surface Enhancement (INCASE) 2023, Lecture Notes in Mechanical Engineering　239-243　2024/05/07

    Publisher: Springer Nature Singapore

    DOI： 10.1007/978-981-99-8643-9_28 　

    ISSN： 2195-4356

    eISSN： 2195-4364

  5. 2D X-ray diffraction method for evaluating the local crystallization of Fe-based amorphous alloy ribbon induced by ultrashort pulsed laser local heating International-journal Peer-reviewed

    Chieko Kuji, Masayoshi Mizutani, Tsunemoto Kuriyagawa, Hitoshi Soyama

    Materials Today Communications　37　107166-107166　2023/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.mtcomm.2023.107166 　

    ISSN： 2352-4928

  6. Experimental study on the effect of the milling condition of an aluminum alloy on subsurface residual stress International-journal International-coauthorship Peer-reviewed

    Chieko Kuji, Christopher R. Chighizola, Michael R. Hill, Jan C. Aurich, Hitoshi Soyama

    The International Journal of Advanced Manufacturing Technology　127　5487-5501　2023/07/14

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00170-023-11921-0 　

    ISSN： 0268-3768

    eISSN： 1433-3015

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    Abstract Aluminum alloys used in monolithic parts for aerospace applications are subjected to distortion and residual stress (RS) generated by milling, affecting the product fatigue life. Particularly, the change in RS with depth (z) has a characteristic distribution with a maximum compressive RS at a z several tens of micrometers from the surface; however, the RS value depends on the measurement method used. In this study, the RS distribution with z from the surface after milling was measured for the AA7050-T7451 aluminum alloy by two-dimensional X-ray diffraction (2D method). The results were compared with those of four prior measurement methods, and the validity of 2D method was verified. The changes in subsurface RS with z showed similar distributions under all measurement conditions except when cos(α)-XRD was employed. The 2D method provides high repeatability. The in-plane RS distribution was also measured using 2D method to investigate the effect of milling conditions on this distribution. The RS values varied markedly depending on the measurement position, particularly at a small collimator diameter of 0.146 mm, allowing detection of localized extreme RS values. The maximum RS at z = 0 mm was − 85.6 MPa at a cutting speed of vc = 200 m/s and feed per tooth of fz = 0.05 mm, while it was − 16 MPa for vc = 450 m/s and 6.8 MPa for fz = 0.2 mm, revealing that the compressive RS changes to tensile RS as vc and fz increase.

  7. Relationship between blanking performance and microstructure of annealed Fe–Si–B–Cr amorphous alloy sheets International-journal Peer-reviewed

    Chieko Kuji, Masayoshi Mizutani, Kana Takenaka, Keita Shimada, Toyohiko J. Konno, A. Toshimitsu Yokobori, Tsunemoto Kuriyagawa

    Precision Engineering　82　33-43　2023/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.precisioneng.2023.03.004 　

    ISSN： 0141-6359

  8. Fabrication of temperature-selective thermal radiation surfaces utilizing surface texturing International-journal Peer-reviewed

    Chieko Kuji, Masayuki Ishii, Ryuichi Yoshikawa, Masayoshi Mizutani, Hitoshi Soyama

    Precision Engineering　82　1-9　2023/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.precisioneng.2023.03.003 　

    ISSN： 0141-6359

  9. Comparison of the effects of submerged laser peening, cavitation peening and shot peening on the improvement of the fatigue strength of magnesium alloy AZ31 International-journal International-coauthorship Peer-reviewed

    Hitoshi Soyama, Chieko Kuji, Yiliang Liao

    Journal of Magnesium and Alloys　11　(5)　1592-1607　2023/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.jma.2023.04.004 　

    ISSN： 2213-9567

  10. Effect of local heating by ultrashort pulsed laser on Fe–Si–B–Cr amorphous alloys and its influence on blanking machinability International-journal Peer-reviewed

    Chieko Kuji, Masayoshi Mizutani, Kana Takenaka, Keita Shimada, Toyohiko J. Konno, Hitoshi Soyama, Tsunemoto Kuriyagawa

    Precision Engineering　81　135-144　2023/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.precisioneng.2023.02.007 　

    ISSN： 0141-6359

  11. Mechanical Surface Treatment of Titanium Alloy Ti6Al4V Manufactured by Direct Metal Laser Sintering Using Laser Cavitation International-journal Invited Peer-reviewed

    Chieko Kuji, Hitoshi Soyama

    Metals　13　(1)　181-181　2023/01/16

    Publisher: MDPI AG

    DOI： 10.3390/met13010181 　

    eISSN： 2075-4701

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    Additive manufactured (AM) metals are attractive materials for medical implants, as their geometries are directly produced from computer-aided design (CAD)/computer-aided manufacturing (CAM) data. However, the fatigue properties of AM metals are weak compared with bulk metals, which is an obstacle to the practical applications of AM metals. To improve the fatigue properties of AM metals, we developed a mechanical surface treatment using laser cavitation. When we irradiate a pulsed laser to a metallic surface in water, laser ablation is generated, and a bubble that behaves like a cavitation is produced. The bubble is referred to as a “laser cavitation”. In the surface treatment using laser cavitation, we use the plastic deformation caused by the impact force at the bubble collapse and pulsed laser energy that produces local melting at the same time. Thus, the mechanical surface treatment using laser cavitation is a type of surface mechanical alloying. In this study, to demonstrate the improvement in the fatigue properties of AM metals, we treated titanium alloy Ti6Al4V, which was manufactured by direct metal laser sintering (DMLS), with laser cavitation, and we evaluated the surface morphology, roughness, residual stress, hardness, and finally tested it using a torsion fatigue test. Unmelted particles on the DMLS surface, which cause fatigue cracks, were melted and resolidified using laser cavitation, resulting in a reduction of the maximum heights of roughness (Rz) of about 75% and the arithmetical mean roughness (Ra) of about 84% of the non-peened one. Although tensile residual stresses of about 80–180 MPa were generated on the as-built surface, compressive residual stresses of about −80 MPa were introduced by laser cavitation. Furthermore, laser cavitation formed Ti4O5 oxide film, which increased the surface hardness by about 106%. Finally, we performed torsional fatigue tests and revealed that laser cavitation extended the fatigue life from 19,791 cycles to 36,288 cycles at an applied shear stress (τa) at 460 MPa, which is effective in suppressing crack initiation.

  12. Influence of the Impact Angle on Machining in Powder Jet Processing International-journal Peer-reviewed

    Chieko Kuji, Kuniyuki Izumita, Keita Shimada, Masayoshi Mizutani, Keiichi Sasaki, Tsunemoto Kuriyagawa

    International Journal of Automation Technology　17　(1)　5-13　2023/01/05

    Publisher: Fuji Technology Press Ltd.

    DOI： 10.20965/ijat.2023.p0005 　

    ISSN： 1881-7629

    eISSN： 1883-8022

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    Powder jet machining is a blast machining process in which micrometer-order particles are projected onto a workpiece at near-supersonic speeds, to remove the workpiece (abrasive jet machining (AJM)) or to deposit the particles (powder jet deposition (PJD)). We report a novel dental treatment method for powder jet machining using hydroxyapatite, which is the main component of teeth, as deposited particles. The surfaces and interdental spaces of human teeth are not only flat, but also have complex groove structures. However, PJD and AJM exhibit impact-angle-dependent machining phases. Therefore, it is necessary to investigate the effect of the particle impact angle on machining, before dental treatment. Furthermore, because machining interacts not only with the particle impact angle but also with the particle impact velocity, a comprehensive investigation of the effects of the machining parameters is required, for delineating the phase-transition conditions. Accordingly, in this study, we conducted machining experiments using hydroxyapatite particles (particle diameter, 2.16 μm) and four different blasting angles of 30°, 45°, 60°, and 90°, to infer the machining amount. Machining efficiency was evaluated based on the amount of machining. The impact angles and velocities of the particles were calculated using computational fluid dynamics (CFD). Three-dimensional process mapping was performed using the machining amount, particle impact angle, and particle impact velocity, obtained from the experiments and CFD calculations. The results showed that PJD crossed to AJM at the impact angle of approximately 60°. Moreover, PJD exhibited high processing efficiency for impact angles above 60° and impact velocities in the 280–310 m/s range. In contrast, AJM exhibited high processing efficiency for impact angles below approximately 35° and impact velocities above 310 m/s.

  13. Improving effects of cavitation peening, using a pulsed laser or a cavitating jet, and shot peening on the fatigue properties of additively manufactured titanium alloy Ti6Al4V International-journal Peer-reviewed

    Hitoshi Soyama, Chieko Kuji

    Surface and Coatings Technology　451　129047-129047　2022/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.surfcoat.2022.129047 　

    ISSN： 0257-8972

  14. Evaluation of fracture properties of annealed Fe–Si–B–Cr amorphous alloys using micro-tensile tests and blanking machinability International-journal Peer-reviewed

    Chieko Kuji, Masayoshi Mizutani, Keita Shimada, Ken Suzuki, Hideo Miura, Tsunemoto Kuriyagawa

    Materials Science and Engineering: A　848　143483-143483　2022/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.msea.2022.143483 　

    ISSN： 0921-5093

  15. Crystallization behavior and machining properties of annealed Fe-Si-B-Cr amorphous alloys International-journal Peer-reviewed

    Chieko Kuji, Kana Takenaka, Masayoshi Mizutani, Keita Shimada, Tsunemoto Kuriyagawa, Toyohiko J. Konno

    JOURNAL OF MATERIALS SCIENCE　56　(29)　16697-16711　2021/10

    DOI： 10.1007/s10853-021-06346-7 　

    ISSN： 0022-2461

    eISSN： 1573-4803

  16. Optimization of Residual Stress Measurement Conditions for a 2D Method Using X-ray Diffraction and Its Application for Stainless Steel Treated by Laser Cavitation Peening International-journal International-coauthorship Peer-reviewed

    Hitoshi Soyama, Chieko Kuji, Tsunemoto Kuriyagawa, Christopher R. Chighizola, Michael R. Hill

    MATERIALS　14　(11)　2021/06

    DOI： 10.3390/ma14112772 　

    eISSN： 1996-1944

  17. Development of dental powder jet deposition handpiece utilizing particle feed mechanism of tablet cutting Peer-reviewed

    TOMIE Akihiko, YAMAMOTO Hiroki, HONGO Nami, MORITA Ryuki, KUJI Chieko, SHIMADA Keita, MIZUTANI Masayoshi, IZUMITA Kuniyuki, SASAKI Keiichi, KURIYAGAWA Tsunemoto

    Journal of the Japan Society for Abrasive Technology　65　(1)　36-41　2021/01/01

    Publisher: The Japan Society for Abrasive Technology

    DOI： 10.11420/jsat.65.36 　

    ISSN： 0914-2703

    eISSN： 1880-7534

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    Powder jet deposition (PJD) is a coating technique that can form films under conditions of room temperature and atmospheric pressure. We have developed a dental treatment with this technique to form hydroxyapatite (HA) films on human teeth. However, the micron-order HA particles show a high degree of cohesiveness, which results in residual particles on the pipe transporting the particles from the particle tank to the handpiece. Therefore, we developed a dental PJD handpiece without a particle-transporting pipe, utilizing a particle feed mechanism of tablet cutting. The experimental results showed that the developed handpiece formed HA film without residual particles on the pipe.

  18. Basic Research for New Tooth Whitening Applied the Powder Jet Deposition International-journal Peer-reviewed

    Kuniyuki Izumita, Ryo Akatsuka, Hiroki Hihara, Akihiko Tomie, Chieko Kuji, Tsunemoto Kuriyagawa, Keiichi Sasaki

    Acta Scientific Dental Scienecs　3　(9)　23-31　2019/08/14

    Publisher: Acta Scientific Publications Pvt. Ltd.

    DOI： 10.31080/asds.2019.03.0615 　

    ISSN： 2581-4893

    eISSN： 2581-4893

  19. Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) Peer-reviewed

    TOMIE Akihiko, KUJI Chieko, AKATSUKA Ryo, SASAKI Keiichi, SHIMADA Keita, MIZUTANI Masayoshi, KURIYAGAWA Tsunemoto

    Transactions of the JSME (in Japanese)　83　(856)　17-00169-17-00169　2017

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/transjsme.17-00169 　

    eISSN： 2187-9761

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    Powder jet machining is one of blasting processes conducted under room temperature and atmospheric pressure. This process brings both deposition and removal process, and in this study, it refers to powder jet deposition (PJD) and abrasive jet machining (AJM). As an application of PJD, the authors have proposed an innovative dental treatment method with the hydroxyapatite (HA) fine particle. By this method, thick HA coating can be fabricated directly in the human oral cavity. In this study, the effect of the particle impact angle was investigated as a parameter that affects the machining phenomenon. The experiments showed that the machining phenomenon transited depending on the blasting angle. In the vertical blasting condition, PJD process was just observed. On the other hand, in the more acute blasting angle such as 45 deg. or 60 deg. both coating and removal process appeared at the same time and in the most acute angle of 30 deg. only removal process was detected. The TEM observations showed that the impact surface of the HA substrate deformed and the deformation depth increased as the blasting angle get more acute. The smoothed particle hydrodynamics (SPH) method was utilized for the analysis for the fracture behavior of the HA substrate. The result indicated that the decrease of the impact angle induced the increase of the strain and the temperature of the interface between the particle and the substrate. Thus it is concluded that the shear stress, which refers to the impact angle, induces the destruction of the substrate by the deformation and the brittle fracture due to the thermal stress.

  20. Particle fracture behavior and deposition mechanism in powder jet deposition (PJD) Peer-reviewed

    MIZUTANI Masayoshi, KUJI chieko, OHISA Hiroyuki, NISHIMURA Shunske, MIZUTANI Koichi, AKATSUKA Ryo, SASAKI Keiichi, XU Shaolin, SHIMADA Keita, KURIYAGAWA Tsunemoto

    Journal of the Japan Society for Abrasive Technology　61　(1)　28-33　2017

    Publisher: The Japan Society for Abrasive Technology

    DOI： 10.11420/jsat.61.28 　

    ISSN： 0914-2703

    eISSN： 1880-7534

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    This study was performed to investigate the mechanism underlying the deposition process in powder jet deposition (PJD). To examine the process of deposition, fractured HA particles were retrieved and observed by transmission electron microscopy (TEM). The untreated powders were polycrystalline, consisting of crystal grains 0.5 - 1.0μm in diameter, while the retrieved fractured particles consisted of nanometer-order crystal grains. Strain analysis of the particle interior showed that these minute crystal grains exist in the area of high stress, where the particles are colliding, and suggested that they appear as densely packed regions in deposited films. On the other hand, sparse regions exist in the boundary regions of the densely packed regions, suggesting that the efficiency of deposition is a function of the size of polycrystalline regions of nanometer-ordered crystal grains. Moreover, the ratio of deposition of one particle was estimated to be 6.57% using a classical molecular dynamics (CMD) method and a smoothed particle hydrodynamics (SPH) method.

  21. Development of Powder Jet Deposition Technique and New Treatment for Discolored Teeth International-journal Peer-reviewed

    Kuniyuki Izumita, Ryo Akatsuka, Akihiko Tomie, Chieko Kuji, Tsunemoto Kuriyagawa, Keiichi Sasaki

    Interface Oral Health Science 2016　257-267　2016/12/10

    Publisher: Springer Singapore

    DOI： 10.1007/978-981-10-1560-1_21 　

  22. Fabrication of hydroxyapatite film by powder jet deposition Peer-reviewed

    TOMIE Akihiko, KUJI Chieko, OHISA Hiroyuki, SHIMADA Keita, MIZUTANI Masayoshi, SASAKI Keiichi, KURIYAGAWA Tsunemoto

    Transactions of the JSME (in Japanese)　81　(832)　15-00189-15-00189　2015

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/transjsme.15-00189 　

    eISSN： 2187-9761

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    The authors have proposed a new dental treatment method by using powder jet deposition (PJD) technique to make coatings on human teeth. The method utilizes hydroxyapatite (HA), which is the main element of human hard tissue, as a restoration material. The coating process is achieved by high speed impacts of the particles on a tooth, and it can be carried out under room temperature and the atmospheric pressure. The thick PJD film is obtained through the accumulation of fractured parts of particles. This study focuses on the microstructures of the HA particles and the deposited film. To investigate the effect of particle crystal structures, two types of HA particles were produced: one (Type A particle) is covered with an amorphous surface, whose thickness is approximately tens of micrometers; the other one (Type B particle) is a type of complete-crystal-growth particles, which are produced by heating the particle A at 230°C for 12 hours. The film fabrication experiments were performed with these particles and machined areas were observed with a scanning electron microscope. It was found that the fabricated film with Type A particles was spalled during blasting. In contrast, the fabricated HA film with Type B particles is well deposited without film spalling. To further investigate the microstructures of the HA film, observations with a transmission electron microscope were conducted. The dark field image of the film with a Type A particle implies that the created HA layer consists of HA crystals of one to tens of nanometers. The bright field image indicates that cracks of approximately 300 nm generated in the film. Thus the mechanical strength of the film fabricated using the Type A particle is not strong enough against the subsequent particle impacts and the pressure of blasted air. In contrast, cracks were not observed in the film created with the Type B particle.

  23. Deposition of hydroxyapatite film within a cavity: Dental application of powder jet deposition Peer-reviewed

    TOMIE Akihiko, KUJI Chieko, MIZUKUCHI Naohide, NISHIKAWA Chihiro, SHIMADA Keita, IZUMITA Kuniyuki, AKATSUKA Ryo, SASAKI Keiichi, MIZUTANI Masayoshi, KURIYAGAWA Tsunemoto

    Journal of the Japan Society for Abrasive Technology　57　(12)　800-805　2013

    Publisher: The Japan Society for Abrasive Technology

    DOI： 10.11420/jsat.57.800 　

    ISSN： 0914-2703

    eISSN： 1880-7534

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    Conventional dental treatment, which is usually conducted through cavity preparation and filling with dental material, has a significant risk of secondary caries. To avoid this risk, a new dental treatment using powder jet deposition (PJD) has been proposed. PJD is a coating process using accelerated particles, and hydroxyapatite (HA) particles are directly impacted for the creation of HA films on human teeth. In this study, the behavior of HA particles impacting against the bottom of a cavity was visualized through a computational fluid dynamics (CFD) method. The simulation results clarified the impact speed distribution and the ratio R of the particles impacting the bottom to the total blasted particles. PJD experiments were then conducted to ascertain which simulated parameter contributes to actual deposition efficiency. The experimental results indicated that the ratio <I>R</> has a negative correlation with the blasting distance, and a blasting distance of 1 mm provided the most efficient treatment.

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Misc. 19

  1. 奨励賞受賞論文：パウダージェットデポジションの付着現象ダイナミクス解明と新しい歯科治療への応用展開 Invited

    久慈千栄子

    2024年度砥粒加工学会学術講演会講演論文集　390-395　2024/08

  2. 微細構造の調整により、アモルファス合金の加工性を大幅に向上 女性の視点で「新しいものづくり」を考える

    天田財団ニュース　2023 Autumn　(15)　12-13　2023/11

  3. Development of Torsion Fatigue Tester to Evaluate Surface Modification Layer of 3D-Metal

    Hitoshi Soyama, Chieko Kuji

    Metal Finishing News　24　(September)　52-55　2023/09

  4. Development of New Machining Method by Microstructure Control of Amorphous Alloys

    KUJI Chirko

    The Proceedings of Mechanical Engineering Congress, Japan　2023　J132-04　2023

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemecj.2023.j132-04 　

    eISSN： 2424-2667

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    Amorphous alloys have no long-periodic ordered crystalline structure; hence no magnetic anisotropy or pinning effect of the magnetic wall due to crystals is present, resulting in high soft magnetic properties. Material properties of amorphous alloys vary depending on the constituent elements. In particular, Fe-based amorphous alloys have high saturation magnetic flux density and low iron loss. Therefore, they are expected to be applied to core materials of motors with high energy-saving effects. However, the mechanical properties of materials, such as their high strength, hardness, and toughness, can present difficulties in machining. The magnetic properties that determine product performance and the mechanical properties that cause difficult machinability are all derived from the amorphous structure. The author aims to improve machinability by controlling the microstructure of amorphous alloys while preserving their soft magnetic properties. In this paper, the author outlines a new machining method utilizing microstructure control of Fe-based amorphous alloys and describes prospects.

  5. 東北大学大学院工学研究科ファインメカニクス専攻 材料メカニクス講座 知的計測評価学分野—Department of Finemechanics, Graduate School of Engineering, Tohoku University Intelligent Sensing of Materials, Materials Physics and Engineering

    祖山 均, 久慈 千栄子

    ターボ機械 = Turbomachinery　50　(12)　756-762　2022/12

    ISSN： 0385-8839

  6. Creation of functional heat radiation surface by surface texturing

    KUJI Chieko, ISHII Masayuki, YOSHIKAWA Ryuichi, SOYAMA Hitoshi

    The Proceedings of the Materials and Mechanics Conference　2022　OS1802　2022

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemm.2022.os1802 　

    eISSN： 2424-2845

    More details Close

    Industrial interest in thermal management is rapidly increasing due to the increase in the amount of heat generated by semiconductor devices as their performance improves in terms of miniaturization, higher power output, and higher density. Radiation of heat from a material surface is a phenomenon of electromagnetic wave emission, and the wavelength of the emitted electromagnetic wave varies with temperature according to Planck's law. In this paper, we aim to create functional heat radiation surfaces that can enhance heat dissipation performance in a specific temperature range by controlling the wavelength range of electromagnetic waves emitted from the material surface. Micro-cutting and ultrashort pulsed laser machining were used to fabricate various microstructures and their effects on heat radiation were investigated. It was found that the combination of a groove structure with an electromagnetic wavelength size and a sub-micrometer size groove structure can provide a temperature selectivity that increases the radiation flow in a specific temperature range.

  7. Local crystallization investigation of amorphous alloys using a two-dimensional detector by X-ray diffraction method

    KUJI Chieko, SOYAMA Hitoshi

    The Proceedings of the Materials and Mechanics Conference　2022　OS0502　2022

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemm.2022.os0502 　

    eISSN： 2424-2845

    More details Close

    Amorphous alloys without a crystalline structure exhibit excellent soft magnetic properties but are difficult to machine due to their tough mechanical properties. The authors have proposed a new machining method that improves machinability by crystallizing only the local regions involved in machining, thereby reducing local strength and toughness. To realize this method, it is necessary to evaluate the crystallinity of the local area nondestructively, but it is difficult to detect a local area of crystals precipitated in amorphous materials by the conventional X-ray diffraction method (sin2ψ method). In this paper, we attempted to investigate the crystallinity of the local area using a two-dimensional X-ray diffraction method (2D method) with a two-dimensional detector. Fe-based amorphous alloys were locally crystallized using an ultrashort pulsed laser with a beam diameter of about 66 μm. Then, it was revealed that the 2D method can evaluate even a small area of crystallization within several tens of micrometers.

  8. Proposal of Evaluation Method of Elastic and Plastic Properties of Mechanical Surface Modified Layer of Metallic Materials by Indentation Test

    SOYAMA Hitoshi, KUJI Chieko

    The Proceedings of the Materials and Mechanics Conference　2022　OS0517　2022

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemm.2022.os0517 　

    eISSN： 2424-2845

    More details Close

    In order to improve fatigue properties of metallic materials, mechanical surface modification such as shot peening is one of powerful methods. Major key parameters of the material properties on the improvement are work hardening and introduction of compressive residual stress. In the case of measurement by using an indentation test, hardness which relates resistance on plasticity such as yield stress is evaluated, and residual stress is also affected by residual stress. Namely, elastic properties such as compressive residual stress can be measured by the indention test as well as material flow stress characteristic of the transition from elastic to plastic deformation. In the present paper, an evaluation method of elastic and plastic properties of mechanical surface modified layer by the indentation test was proposed. In view point of practical application, as the indentation test which was similar to Rockwell superficial hardness was useful, the ratio of preliminary minor load and additional major load was investigated.

  9. R&D on Mercury Target for Spallation Neutron Source to Improve the Durability under High Power Operation (1) Mechanism of Damage Mitigation Effects by Gas Bubbles and Damage Observation Results

    粉川広行, 川島広之, 有吉玄, 涌井隆, 猿田晃一, 直江崇, 羽賀勝洋, 二川正敏, 祖山均, 久慈千栄子, 伊藤啓, 田中伸厚

    日本原子力学会秋の大会予稿集(CD-ROM)　2022　2022

  10. R&D on Mercury Target for Spallation Neutron Source to Improve the Durability under High Power Operation (2) Dominant factors in local impact forces caused by bubble collapse

    川島広之, 粉川広行, 二川正敏, 祖山均, 久慈千栄子, 田中伸厚

    日本原子力学会秋の大会予稿集(CD-ROM)　2022　2022

  11. 地元貢献を目指して

    久慈 千栄子

    まてりあ　59　(3)　161-161　2020/03/01

    Publisher: 公益社団法人 日本金属学会

    DOI： 10.2320/materia.59.161 　

    ISSN： 1340-2625

    eISSN： 1884-5843

  12. Development of thin film forming process of magnetostrictive bulk alloy, and development of high functional multilayer surface creation process by mechanical processing

    久慈千栄子, 古屋泰文, 吉年規治, 今野豊彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2019　2020

  13. パウダージェットデポジション法を用いたTiO2配合HA膜生成に関する基礎的研究

    泉田 一賢, 赤塚 亮, 冨江 瑛彦, 久慈 千栄子, 厨川 常元, 佐々木 啓一

    日本補綴歯科学会誌　9　(特別号)　183-183　2017/06

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  14. パウダージェットデポジション装置を用いたTiO2配合HA膜生成と口腔内安定性に関する基礎的研究

    泉田一賢, 赤塚亮, 佐々木啓一, 冨江瑛彦, 久慈千栄子, 厨川常元, 厨川常元

    粉体粉末冶金協会講演概要集　2017　2017

  15. パウダージェットデポジション(PJD)における粒子破砕挙動と成膜メカニズムに関する研究

    水谷正義, 久慈千栄子, 大久洋幸, 西村俊亮, 水谷公一, 赤塚亮, 佐々木啓一, XU Shaolin, 嶋田慶太, 厨川常元

    砥粒加工学会学術講演会講演論文集(CD-ROM)　2016　2016

  16. パウダージェットデポジションに関する研究

    大久 洋幸, 久慈 千栄子, 冨江 瑛彦, 嶋田 慶太, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 水谷 正義, 厨川 常元

    2015年砥粒加工学会卒業研究発表会発表論文集　13-14　2015

  17. パウダージェットデポジションにおける成膜現象の解明—被加工物の機械的性質が成膜現象に及ぼす影響

    大久 洋幸, 久慈 千栄子, 嶋田 慶太, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 水谷 正義, 厨川 常元

    精密工学会学術講演会講演論文集　2015A　495-496　2015

    Publisher: 公益社団法人 精密工学会

    DOI： 10.11522/pscjspe.2015a.0_495 　

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    近年粒子の噴射加工において特定の条件下で粒子が破砕し一部が付着する現象が確認され，この現象を用いた加工法であるパウダージェットデポジションに対して原理の解明や活用に関する研究が行われてきた．本研究では被加工材の機械的性質が成膜現象に与える影響について検討を行った．押し込み試験から被加工材の機械的性質の測定を行った．その後噴射実験を行い，加工量と成膜面の性状を比較して機械的特性の影響について検討した．

  18. ハイドロキシアパタイト粒子衝突を用いた加工特性変化

    久慈 千栄子, 大久 洋幸, 冨江 瑛彦, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 今野 豊彦, 嶋田 慶太, 水谷 正義, 厨川 常元

    2014年度精密工学会東北支部学術講演会講演論文集　21-22　2014/11

  19. B01 Hydroxyapatite film formation by powder jet deposition

    Tomie Akihiko, Kuji Chieko, Shimada Keita, Akatuka Ryo, Sasaki Keiichi, Konno Toyohiko J, Mizutani Masayoshi, Kuriyagawa Tsunemoto

    The Proceedings of The Manufacturing & Machine Tool Conference　2014.10　67-68　2014

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemmt.2014.10.67 　

    eISSN： 2424-3094

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    Powder jet deposition (PJD) is a coating process through the use of high speed particle impact. The authors have proposed a new dental treatment method by using this process with hydroxyapatite (HA) powder, which accomplishes cavity protection, caries prevention, and tooth color improvement. The coating principle of PJD is accumulation of chemical bonds among impacted particles. Hence it is estimated that the fractured HA particle crystal architecture affects the deposition property. In this study, PJD coating experiments were conducted with two kinds of HA particles. It is found that the mechanical strength of the formed films depends on the density of the chemical bonds among the crystal grain boundaries in the films and HA particles suited for PJD can be designed with the control of the powder thermal treatment condition.

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Presentations 44

  1. 熱的組織改質させたアモルファス合金の加工品質評価における破面解析の応用 Invited

    久慈千栄子

    日本材料学会 公開部門委員会(第 184 回破壊力学部門委員会)　2025/05/30

  2. わたしの目指すものづくり～地球と人間を豊かにするサステナブルものづくり～ Invited

    久慈千栄子

    第2回砥粒加工学会アフタヌーンセミナー　2025/01/31

  3. 超短パルスレーザーによるアモルファス合金の局所組織改質 Invited

    久慈千栄子

    一般社団法人レーザー学会学術講演会第45回年次大会　2025/01/23

  4. サステナブルものづくりを目指して Invited

    久慈千栄子

    第1回 若手教員によるオープンテックカフェ　2024/12/19

  5. アモルファス合金の準安定性を活用した加工手法の開発 Invited

    久慈千栄子

    第３０回青葉工学研究奨励賞 受賞者授賞式及び講演会　2024/12/13

  6. ウルトラファインバブルを用いた高粘度インクの管内摩擦低減

    松塚悠希, 久慈千栄子, 魚谷明日香, 髙畑和弘, 小瀬村透, 水谷正義

    2024年度精密工学会東北支部講演会　2024/11/23

  7. Notch effect in blanking of local heating with ultrashort pulsed laser for Fe-based amorphous alloys and its influence on soft magnetic properties International-presentation Invited

    Chieko Kuji, Tatsuya Fujii, Tsunehisa Suzuki, Masayoshi Mizutani

    The 20th International Conference on Precision Engineering (ICPE2024)　2024/10/24

  8. Effect of Fe–Si–B Based Amorphous Alloys Composition on Thermal Microstructural Changes and Mechanical Properties

    2024/09/28

  9. 奨励賞受賞記念講演：パウダージェットデポジションの付着現象ダイナミクス解明と新しい歯科治療への応用展開 Invited

    久慈千栄子

    2024年度砥粒加工学会学術講演会　2024/08/28

  10. アモルファス合金箔帯の打ち抜き加工性向上に向けた新たな取組み Invited

    久慈千栄子

    第62回テクニスト研究会（特殊加工に関するセミナー ）　2024/04/26

  11. Microstructures and mechanical properties of annealed Fe-based amorphous alloys International-presentation Invited

    Chieko Kuji

    International Workshop on Micro-Systems and Materials (IWMM2024)　2024/03/10

  12. パウダージェット加工の歯科治療への適用指針 Invited

    久慈千栄子

    精密工学会ナノ精度機械加工専門委員会：第11回ナノ精度チャンネル　2023/10/30

  13. 持続可能な社会に貢献する アモルファス合金の新加工手法開発

    久慈 千栄子

    日本機械学会 RC295「持続可能社会を実現するDX時代の生産技術に関する研究分科会」若手シンポジウム　2023/10/13

  14. Fluid/Material Coupled Numerical Simulation of a Bubble Collapse near a Wall for Laser Cavitation Peening International-presentation Invited

    Yuka Iga, Chieko Kuji, Hirotoshi Sasaki, Hitoshi Soyama

    3rd International Conference on Advanced Surface Enhancement (INCASE 2023)　2023/09/27

  15. Blanked Surface Characteristics of Amorphous Alloys with Local Microstructure Modification by Ultrashort Pulsed Laser International-presentation

    Chieko Kuji

    3rd International Conference on Advanced Surface Enhancement (INCASE 2023)　2023/09/26

  16. Effect of microstructure of amorphous alloys on micro-regional mechanical properties International-presentation Invited

    Chieko Kuji, Masayoshi Mizutani, Keita Shimada, Ken Suzuki, Hideo Miura, Tsunemoto Kuriyagawa

    6th International Conference on Materials Science & Nanotechnology (ICMSN 2023)　2023/09/07

  17. Development of New Machining Method by Microstructure Control of Amorphous Alloys

    Chieko Kuji

    2023/09/04

  18. Effect of microstructure on microregion strength of amorphous alloys

    Chieko Kuji

    2023 M&M/CMD Symposium for Young Researchers　2023/08/08

  19. Comparison on Fatigue Strength of Additive Manufactured Titanium Alloy by Various Peening Methods

    2023/05/29

  20. Improvement of Fatigue Strength of Stainless Steel SUS316L by Fine Particle Bombarding Process

    2023/03/17

  21. Improvement of Fatigue Life of Additive Manufactured Ti6Al4V by Cavitation Peening

    2023/03/16

  22. 結晶のない金属材料とは？―微細組織制御による新たな加工法の開発― Invited

    久慈千栄子

    日本材料学会東北支部 2022年度第2回材料工学セミナー（オンライン）　2022/11/29

  23. Relationship between Micro-region Fracture Properties and Machinability of Annealed Fe-based Amorphous Alloys International-presentation Invited

    Chieko Kuji, Masayoshi Mizutani, Keita Shimada, Ken Suzuki, Hideo Miura, Tsunemoto Kuriyagawa

    Global Virtual Summit on Materials Science & Engineering (Materials Science 2022)　2022/10/22

  24. Local Microstructure Control of Amorphous Alloys by Utilizing Ultrashort Pulsed Laser for Improvement of Machinability International-presentation Invited

    Chieko Kuji

    European Congress on Laser, Optics and Photonics (Laser Optics 2022)　2022/05/23

  25. Effect of Heat Treatment on Blanking of Fe-Si-B-Cr Amorphous Alloys International-presentation

    Chieko Kuji

    The 16th China-Japan International Conference on Ultra-Precision Machining Process 2022(CJUMP2022)　2022/03/27

  26. R&D on Mercury Target for Spallation Neutron Source to Improve the Durability under High Power Operation (2) Dominant factors in local impact forces caused by bubble collapse

    川島広之, 粉川広行, 二川正敏, 祖山均, 久慈千栄子, 田中伸厚

    日本原子力学会秋の大会　2022

  27. R&D on Mercury Target for Spallation Neutron Source to Improve the Durability under High Power Operation (1) Mechanism of Damage Mitigation Effects by Gas Bubbles and Damage Observation Results

    粉川広行, 川島広之, 有吉玄, 涌井隆, 猿田晃一, 直江崇, 羽賀勝洋, 二川正敏, 祖山均, 久慈千栄子, 伊藤啓, 田中伸厚

    日本原子力学会秋の大会　2022

  28. Proposal of Evaluation Method of Elastic and Plastic Properties of Mechanical Surface Modified Layer of Metallic Materials by Indentation Test

    SOYAMA Hitoshi, KUJI Chieko

    The Proceedings of the Materials and Mechanics Conference　2022/09/27

    More details Close

    In order to improve fatigue properties of metallic materials, mechanical surface modification such as shot peening is one of powerful methods. Major key parameters of the material properties on the improvement are work hardening and introduction of compressive residual stress. In the case of measurement by using an indentation test, hardness which relates resistance on plasticity such as yield stress is evaluated, and residual stress is also affected by residual stress. Namely, elastic properties such as compressive residual stress can be measured by the indention test as well as material flow stress characteristic of the transition from elastic to plastic deformation. In the present paper, an evaluation method of elastic and plastic properties of mechanical surface modified layer by the indentation test was proposed. In view point of practical application, as the indentation test which was similar to Rockwell superficial hardness was useful, the ratio of preliminary minor load and additional major load was investigated.

  29. Local crystallization investigation of amorphous alloys using a two-dimensional detector by X-ray diffraction method

    KUJI Chieko, SOYAMA Hitoshi

    The Proceedings of the Materials and Mechanics Conference　2022/09/26

    More details Close

    Amorphous alloys without a crystalline structure exhibit excellent soft magnetic properties but are difficult to machine due to their tough mechanical properties. The authors have proposed a new machining method that improves machinability by crystallizing only the local regions involved in machining, thereby reducing local strength and toughness. To realize this method, it is necessary to evaluate the crystallinity of the local area nondestructively, but it is difficult to detect a local area of crystals precipitated in amorphous materials by the conventional X-ray diffraction method (sin2ψ method). In this paper, we attempted to investigate the crystallinity of the local area using a two-dimensional X-ray diffraction method (2D method) with a two-dimensional detector. Fe-based amorphous alloys were locally crystallized using an ultrashort pulsed laser with a beam diameter of about 66 μm. Then, it was revealed that the 2D method can evaluate even a small area of crystallization within several tens of micrometers.

  30. Creation of functional heat radiation surface by surface texturing

    KUJI Chieko, ISHII Masayuki, YOSHIKAWA Ryuichi, SOYAMA Hitoshi

    The Proceedings of the Materials and Mechanics Conference　2022/09/27

    More details Close

    Industrial interest in thermal management is rapidly increasing due to the increase in the amount of heat generated by semiconductor devices as their performance improves in terms of miniaturization, higher power output, and higher density. Radiation of heat from a material surface is a phenomenon of electromagnetic wave emission, and the wavelength of the emitted electromagnetic wave varies with temperature according to Planck's law. In this paper, we aim to create functional heat radiation surfaces that can enhance heat dissipation performance in a specific temperature range by controlling the wavelength range of electromagnetic waves emitted from the material surface. Micro-cutting and ultrashort pulsed laser machining were used to fabricate various microstructures and their effects on heat radiation were investigated. It was found that the combination of a groove structure with an electromagnetic wavelength size and a sub-micrometer size groove structure can provide a temperature selectivity that increases the radiation flow in a specific temperature range.

  31. Blanking of Fe-based Amorphous Alloys Assisted by Heat Treatment International-presentation

    Chieko Kuji

    The 6th International Symposium on Micro/Nano Mechanical Machining and Manufacturing (ISMNM2021)　2021/10/28

  32. アモルファス合金の新加工法の提案

    久慈 千栄子

    精密工学会ナノ精度機械加工専門委員会：第5回ナノ精度チャンネル　2021/10/04

  33. アモルファス金属の加工技術開発

    久慈 千栄子

    文部科学省ナノテクノロジープラットフォーム 令和3年度利用成果発表会　2021/09/16

  34. Development of machining method for soft-magnetic amorphous sheets with optimum heat-treatment

    2020/11/20

  35. パウダージェットデポジション法を用いたTiO2配合HA膜生成に関する基礎的研究

    泉田 一賢, 赤塚 亮, 冨江 瑛彦, 久慈 千栄子, 厨川 常元, 佐々木 啓一

    日本補綴歯科学会第126回学術大会　2017/06

  36. パウダージェットデポジション装置を用いたTiO2配合HA膜生成と口腔内安定性に関する基礎的研究

    泉田一賢, 赤塚亮, 佐々木啓一, 冨江瑛彦, 久慈千栄子, 厨川常元, 厨川常元

    粉体粉末冶金協会　2017

  37. Evaluation in Hydroxyapatite Film Containing TiO2 Particles Fabricated by Powder Jet Deposition

    K. Izumita, R. Akatsuka, A. Tomie, C. Kuji, T. Kuriyagawa, K. Sasaki

    The 6th International Symposium for Interface Oral Health Science　2016/01/19

  38. パウダージェットデポジション(PJD)における粒子破砕挙動と成膜メカニズムに関する研究

    水谷正義, 久慈千栄子, 大久洋幸, 西村俊亮, 水谷公一, 赤塚亮, 佐々木啓一, XU Shaolin, 嶋田慶太, 厨川常元

    砥粒加工学会学術講演会　2016

  39. Evaluation of Hydroxyapatite Film Containing TiO2 Particles by Powder Jet Deposition after Artificial Aging

    K. Izumita, R. Akatsuka, A. Tomie, C. Kuji, T. Kuriyagawa, K. Sasaki

    The 4th Dental Implantology and Biomaterial Academic Symposium in West Coast of Taiwan Straits The 3rd Sino-Japan Dental Science Symposium

  40. Evaluation of Hydroxyapatite Film Containing TiO2 Particles by Powder Jet Deposition

    K. Izumita, R. Akatsuka, A. Tomie, C. Kuji, T. Kuriyagawa, K. Sasaki

    10th Anniversary International Workshop on Biomaterials Interface Science　2015/08/05

  41. パウダージェットデポジションにおける成膜現象の解明—被加工物の機械的性質が成膜現象に及ぼす影響

    大久 洋幸, 久慈 千栄子, 嶋田 慶太, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 水谷 正義, 厨川 常元

    精密工学会学術講演会　2015

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    近年粒子の噴射加工において特定の条件下で粒子が破砕し一部が付着する現象が確認され，この現象を用いた加工法であるパウダージェットデポジションに対して原理の解明や活用に関する研究が行われてきた．本研究では被加工材の機械的性質が成膜現象に与える影響について検討を行った．押し込み試験から被加工材の機械的性質の測定を行った．その後噴射実験を行い，加工量と成膜面の性状を比較して機械的特性の影響について検討した．

  42. パウダージェットデポジションに関する研究

    大久 洋幸, 久慈 千栄子, 冨江 瑛彦, 嶋田 慶太, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 水谷 正義, 厨川 常元

    2015年砥粒加工学会卒業研究発表会　2015

  43. ハイドロキシアパタイト粒子衝突を用いた加工特性変化

    久慈 千栄子, 大久 洋幸, 冨江 瑛彦, 泉田 一賢, 赤塚 亮, 佐々木 啓一, 今野 豊彦, 嶋田 慶太, 水谷 正義, 厨川 常元

    2014年度精密工学会東北支部学術講演会　2014/11

  44. B01 Hydroxyapatite film formation by powder jet deposition

    Tomie Akihiko, Kuji Chieko, Shimada Keita, Akatuka Ryo, Sasaki Keiichi, Konno Toyohiko J, Mizutani Masayoshi, Kuriyagawa Tsunemoto

    The Proceedings of The Manufacturing & Machine Tool Conference　2014

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    Powder jet deposition (PJD) is a coating process through the use of high speed particle impact. The authors have proposed a new dental treatment method by using this process with hydroxyapatite (HA) powder, which accomplishes cavity protection, caries prevention, and tooth color improvement. The coating principle of PJD is accumulation of chemical bonds among impacted particles. Hence it is estimated that the fractured HA particle crystal architecture affects the deposition property. In this study, PJD coating experiments were conducted with two kinds of HA particles. It is found that the mechanical strength of the formed films depends on the density of the chemical bonds among the crystal grain boundaries in the films and HA particles suited for PJD can be designed with the control of the powder thermal treatment condition.

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Industrial Property Rights 1

  1. バイオマスの微細化方法

    祖山均, 北川尚美, 廣森浩裕, 久慈千栄子

    Property Type: Patent

Research Projects 11

  1. ウルトラファインバブルの医用応用に資する生物学的効果とトリガー援用増強効果の解明

    佐々木 啓一, 中村 圭祐, 松浦 寛, 伊賀 由佳, 久慈 千栄子

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2025/04 - 2028/03

  2. 固液気プラズマ4相で成長する自己組織階層構造の形成ダイナミクスの解明

    久慈 千栄子, 稲田 優貴, 小玉 脩平, 児玉 直人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2025/02 - 2028/03

  3. 固気液混相を用いたエネルギーの時間的・空間的凝縮と3D-Metalの疲労強度向上への展開

    祖山 均, 久慈 千栄子, 伊賀 由佳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04 - 2026/03

  4. Elucidating mechanism of energy concentration using liquid-gas phase change and its practical application in the medical and dental engineering

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Institution: Tohoku University

    2022/10 - 2026/03

  5. アモルファス合金の熱的微細組織変化がもたらす加工性向上因子の解明

    久慈 千栄子

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究

    Category: 若手研究

    Institution: 東北大学

    2023/04/01 - 2025/03/31

  6. 水中レーザ加工によるハイブリッドテクスチャリング技術の探求

    久慈 千栄子

    Offer Organization: 公益財団法人天田財団

    System: 2022年度 レーザプロセッシング 奨励研究助成（若手研究者枠）

    Institution: 東北大学

    2022/10 - 2025/03

  7. 2022年度 TUMUG支援事業「スタートアップ研究費」

    久慈 千栄子

    Offer Organization: 東北⼤学⼯学系⼥性研究者育成⽀援推室（ALicE）

    System: 2022年度 TUMUG支援事業「スタートアップ研究費」

    Institution: 東北大学

    2022/09 - 2023/03

  8. Generation of novel functional materials by using hydrodynamic cavitation with particles

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/07 - 2023/03

  9. 2022年度 STEP-ALICEプログラム STEP-ALICE独⾃⽀援

    久慈 千栄子

    Offer Organization: 東北⼤学⼯学系⼥性研究者育成⽀援推室（ALicE）

    System: 2022年度 STEP-ALICEプログラム

    Institution: 東北大学

    2022/07 -

  10. 第４回仙台Ⅰゾンタクラブ東北大学大学院女子学生のための国際学会発表支援事業

    久慈 千栄子

    Offer Organization: 仙台Ⅰゾンタクラブ

    System: 第４回仙台Ⅰゾンタクラブ東北大学大学院女子学生のための国際学会発表支援事業

    Institution: 東北大学

    2022/03 -

  11. 磁歪バルク合金の薄膜化プロセスおよび、機械加工の援用による高機能積層面創生プロセスの開発

    久慈千栄子, 古屋泰文, 吉年規治, 今野豊彦

    Offer Organization: 東北大学金研新素材センター

    System: 2019年度共同利用研究

    2019/04 - 2020/03

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Teaching Experience 3

  1. Special Lecture on Green Data Science　Tohoku University

  2. 機械知能・航空実験Ⅱ　国立大学法人東北大学

  3. Laboratory Experiment Ⅰ　Tohoku University

Social Activities 10

  1. 加工が難しい省エネ材料「アモルファス合金」の加工法を開発

    みらいぶっく

    2025/07 - Present

  2. 新アモルファス合金加工

    2025/01 - Present

  3. 私が目指すサステナブルものづくり

    研究開発関連講演会

    2025/01/15 - 2025/01/15

  4. アモルファス合金ってなに？～地球にやさしいサステナブルものづくり～

    第3回技術交流会

    2024/09/17 - 2024/09/17

  5. 女性研究者のキャリア事例～理系進学のススメ～

    2024/05/31 - 2024/05/31

  6. 工学リケジョの人生設計事例

    リケジョ会議

    2024/01/27 - 2024/01/27

  7. アモルファス合金の微細組織制御を活用した革新的加工法の提案 ーモータコアの打抜き加工への応用展開ー

    社内勉強会

    2023/05/18 - 2023/05/18

  8. 女性エンジニアのキャリア形成

    学生×企業事業座談会

    2022/12/09 - 2022/12/09

  9. モーターを高効率化するアモルファス軟磁性合金の組織制御を援用した加工技術開発

    機械工学特別講義

    2022/12/09 - 2022/12/09

  10. わたし年表から読み解く理系進学のススメ

    女子中高生のためのミニフォーラム『工学にかける私の夢』

    2022/07/27 - 2022/07/27

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Academic Activities 17

  1. 2025年度砥粒加工学会学術講演会 医歯工学セッションオーガナイザ

    2025/03 - Present

    Activity type: Academic society, research group, etc.

  2. The 11th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), Organizer

    2025/02 - Present

    Activity type: Academic society, research group, etc.

  3. 2026年度砥粒加工学会学術講演会 実行委員

    2025/01/20 - Present

    Activity type: Academic society, research group, etc.

  4. The 20th International Conference on Precision Engineering (ICPE2024) Organizing Committee Member

    2023/04 - 2024/10/26

    Activity type: Academic society, research group, etc.

  5. 日本機械学会 第15回生産加工・工作機械部門部門講演会 現地実行委員会

    2024/04/01 - 2024/10/05

    Activity type: Academic society, research group, etc.

  6. 日本機械学会東北支部第60期秋季講演会 機械要素・設計工学 座長

    2024/09/28 - 2024/09/28

    Activity type: Academic society, research group, etc.

  7. 2024年度砥粒加工学会学術講演会 医歯工学セッションオーガナイザ

    2024/02 - 2024/08/28

    Activity type: Academic society, research group, etc.

  8. Abrasive Technology Conference 2023

    2023/04 - 2023/08/30

    Activity type: Academic society, research group, etc.

  9. Leading Edge Manufacturing/Material and Processing (LEM&P2023) Organizer

    2022/09 - 2023/06

    Activity type: Academic society, research group, etc.

  10. M&M・CMD若手シンポジウム2023 表面処理セッション 座長

    2023/08/09 -

    Activity type: Academic society, research group, etc.

  11. 日本機械学会東北支部第58期総会・講演会 生産加工・工作機械/生産システム/交通・物流セッション 座長

    2023/03/17 -

    Activity type: Academic society, research group, etc.

  12. Journal of materials processing technology

    Activity type: Peer review

  13. Wear

    Activity type: Peer review

  14. Journal of manufacturing processes

    Activity type: Peer review

  15. Advances in Manufacturing

    Activity type: Peer review

  16. Ceramics international

    Activity type: Peer review

  17. Crystal Research & Technology

    Activity type: Peer review

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