Development of novel heat resistance material by high-entropy alloy melt-infiltration

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14152
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Arai Yutaro 東京理科大学, 先進工学部マテリアル創成工学科, 講師 (70844439)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: ハイエントロピー材料 / 合金溶融含浸 / セラミックス基複合材料 / 多元素セラミックス / 酸化挙動

Outline of Final Research Achievements

The objective of this study is to develop multi-element ceramic matrix composites (MECMCs) as components of hypersonic vehicles, which are attracting attention as an innovative next-generation transportation system, by the combination of calculation thermodynamics and experiments. high-entropy alloy melt-infiltration methods using the Ti-Zr-Hf-Nb-B and Ti-Zr-Hf-Nb-Si systems is designed by using calculation phase diagrams and MECMCs are successfully obtained. Arc-wind tunnel tests simulating an oxidizing atmosphere with a maximum temperature of about 2500℃ reveal that the surface recession by ~10-15% is observed. The result shows that the recession of MECMCs is prevented in comparison with a conventional aerospace heat resistant material (C/C: carbon fiber reinforced carbon composites).

Free Research Field

熱力学，材料強度学

Academic Significance and Societal Importance of the Research Achievements

本研究では従来の航空宇宙用耐熱材料のように炭素の損耗やSiO2の被膜形成に頼ったコンセプトとは異なる損耗抑制メカニズムを発現する材料を創成した。材料設計に情報科学と熱力学の融合である計算熱力学を取り入れることで，5~6元系という複雑な材料系でも研究期間内に材料プロセスの確立という学術的意義を実現できた。この材料は次世代輸送システムとして音速の5倍以上で飛行する極超音速機用部材として魅力的な候補であり，輸送時間の短縮と効率化，省エネ化という社会的意義の達成に貢献できると考えられる。