2019 Fiscal Year Final Research Report

Systematization of Adamant Thin Films and Fabrication of High-Functional Mechanical Coatings

Research Project

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Project/Area Number	16H02406
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Research Field	Material processing/Microstructural control engineering
Research Institution	Tokyo Institute of Technology
Principal Investigator	Ohtake Naoto 東京工業大学, 科学技術創成研究院, 教授 (40213756)
Co-Investigator(Kenkyū-buntansha)	稗田純子名古屋大学, 工学研究科, 准教授 (40566717) 赤坂大樹東京工業大学, 工学院, 准教授 (80500983) 平田祐樹東京工業大学, 科学技術創成研究院, 助教 (90779068)
Project Period (FY)	2016-04-01 – 2020-03-31
Keywords	構造・機能材料 / 材料加工・処理 / 薄膜 / プラズマ加工 / アダマント
Outline of Final Research Achievements	This research aims to develop novel mechanical coating materials consisting of carbon, boron and nitrogen, which is named “adamant” thin film coatings. Ternary diagram was described using measured data set of mechanical properties of various adamant films, and systematization of adamant films is performed on the diagram. Carbon contents has significant influence for the mechanical properties of adamant films. Nanoindentation hardness of the film sharply decreased when the carbon content exceeds 50at.%. In contrast, the thermal resistivity of the film was improved by decreasing the carbon content. It is interesting result that the wear resistance improves when small amount of B was added in DLC film. Moreover, adhesion of platelet was suppressed on the B containing amorphous carbon films. These results lead us to open novel mechanical coatings using adamant materials.
Free Research Field	機械材料・材料加工
Academic Significance and Societal Importance of the Research Achievements	ダイヤモンドや立方晶窒化ホウ素を始めとする結晶のアダマント材料は，極めて高い機械的特性を有することが知られている反面，アモルファスアダマント材料についての系統的な特性把握は行われていなかった。本研究でホウ素・炭素・窒素からなるアダマント膜を三元図上で体系化したことは，学術的に大きい意義のあるものといえる。さらに，膜の機械的特性が炭素量と大きく関係し，Bを微量（～2.5 at. %）に制御することで，比摩耗量がC100%の場合よりも低く，かつ血小板の付着も低いことが明らかになり，今後の耐摩耗性コーティング設計の新たな指針を与える知見を得ることが出来たのは，社会的に意義のある研究結果である。