2022 Fiscal Year Final Research Report

Fabrication of metallic glass matrix porous composites for next generation metallic biomaterials

Research Project

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Project/Area Number	19K04081
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 18010:Mechanics of materials and materials-related
Research Institution	Kagoshima National College of Technology
Principal Investigator	Tokunaga Hitoo 鹿児島工業高等専門学校, 機械工学科, 教授 (70435460)
Co-Investigator(Kenkyū-buntansha)	東雄一鹿児島工業高等専門学校, 機械工学科, 准教授 (70709336)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	金属ガラス / 複合材料 / 多孔質材料 / ガスアトマイズ / 放電プラズマ焼結 / マルテンサイト変態 / 金属基生体材料
Outline of Final Research Achievements	The effect of alloy composition on the microstructure of Zr-Cu system alloy powders prepared by gas atomization was clarified. In particular, it was found that suitable conditions for preparation of alloy powder, which consists of glassy phase or intermetallic compound ZrCu phase. Furthermore, it has been succeeded that the fabrication of a bulk Zr-Cu system glassy material (sintered compact) by using spark plasma sintering method. On the other hand, it was also found that there is an appropriate range of sintering temperatures to obtain a sintered compact consisting of the glassy phase. At higher sintering temperatures, partially crystallization of the material occurs. In addition, it was found that the crystalline phase formed by high temperature sintering is not the desired structure (ZrCu phase) when an alloy powder with an alloy composition suitable for a sintered body consisting of a glass phase was used.
Free Research Field	機械材料
Academic Significance and Societal Importance of the Research Achievements	本研究の目的は，既存材料の諸課題を解決し，次世代型金属基生体材料を実現することである．得られた成果として，金属ガラスをマトリックスとして特定の金属間化合物が適当に分散した複合材料では，高強度かつ高延性であることがわかった．さらにガスアトマイズ法と放電プラズマ焼結法を組み合わせることで，ガラスマトリックス複合材料を作製できることが示された．得られた知見は，以下4つの観点から新しい生体材料実現の可能性を示唆するものである．（1）高強度かつ高延性，高靭性，（2）高耐食性，（3）低ヤング率，（4）生体機能性の付与．したがって，学術的意義と社会的意義を有する．