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Creation of high-strength biomaterial by hybrid surface treatment using functionally graded layer

Research Project

Project/Area Number 16K17986
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Materials/Mechanics of materials
Research InstitutionNational Institute of Technology, Toyota College

Principal Investigator

Nakamura Yuki  豊田工業高等専門学校, 機械工学科, 准教授 (10612939)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords超高サイクル疲労 / ハイドロキシアパタイト / チタン合金 / 傾斜機能層 / 微粒子ショットピーニング / プラズマ溶射 / ショットピーニング / 溶射 / アコースティックエミッション / 疲労 / 表面改質 / 生体材料
Outline of Final Research Achievements

Fine particle peening (FPP) using hydroxyapatite (HAp) particles was applied to titanium alloys to form the hydroxyapatite transferred and functionally graded layer on the surface. As a result, HAp transferred layer and functionally graded layer were formed on the specimen surface by FPP. In the FPPed specimen, Vickers hardness was increased by FPP compared with that of the untreated specimens, resulting in work-hardening. Rotary bending fatigue tests were carried out on FPPed, plasma sprayed, FPP + plasma sprayed and untreated specimens. The FPPed specimens exhibited higher fatigue strength than the untreated specimens. It is due to the increase in hardness and compressive residual stress by FPP. On the other hand, significant deteriorations of the fatigue strength for the plasma sprayed specimen was observed in comparison with the result for the untreated specimen. The fatigue strength of FPP + plasma sprayed specimen exhibited almost the same fatigue strength as untreated specimen.

Academic Significance and Societal Importance of the Research Achievements

溶射材の疲労強度改善には溶射皮膜のはく離および基材と溶射皮膜の界面強度を制御することが重要である.本研究では,これまで製品加工の最終処理として用いられてきたショットピーニングを,その特性を積極的に利用して溶射の前処理として施すことで学術的課題の解決を試みた.その結果,溶射後の疲労強度も未処理材と同程度確保できることが明らかとなり,将来本研究で得られた知見を利用することで産業分野において使用されている溶射材の安全性・信頼性向上,ひいては溶射処理の革新的なプロセスの確立に寄与するものと期待される.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (3 results)

All 2019 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Effect of Fine Particle Peening using Hydroxyapatite Shot Particles and Plasma Sprayed Hydroxyapatite Coating on Fatigue Properties of Beta Titanium Alloy2017

    • Author(s)
      Yuki Nakamura, Tappei Aoki, Toshihiro Shimizu, Shoichi Kikuchi, Koichiro Nambu, Toshikazu Akahori
    • Journal Title

      WIT Transactions on Engineering Sciences

      Volume: 116 Pages: 205-211

    • DOI

      10.2495/mc170211

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 微粒子ピーニングおよびプラズマ溶射によりハイドロキシアパタイトを被覆したチタン合金の疲労特性2019

    • Author(s)
      水野拓哉,中村裕紀,清水利弘
    • Organizer
      第24回 高専シンポジウムin Oyama
    • Related Report
      2018 Annual Research Report
  • [Presentation] Effect of Fine Particle Peening using Hydroxyapatite Shot Particles and Plasma Sprayed Hydroxyapatite Coating on Fatigue Properties of Beta Titanium Alloy2017

    • Author(s)
      Yuki Nakamura, Tappei Aoki, Toshihiro Shimizu, Shoichi Kikuchi, Koichiro Nambu, Toshikazu Akahori
    • Organizer
      8th International Conference on Computational Methods and Experiments in Material and Contact Characterisation
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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