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先進SiC/SiC複合材料の繊維-マトリックス界面設計と評価

Design and evaluation of fiber/matrix interface for advanced SiC/SiC composites

野澤 貴史; 加藤 雄大*; Snead, L. L.*

Nozawa, Takashi; Kato, Yutai*; Snead, L. L.*

先進SiC/SiC複合材料の繊維-マトリックス界面の中性子照射効果を解明するため、単繊維の微小押し抜き法により界面強度を評価した。高温(1080$$^{circ}$$C),中線量(7.7dpa)において、界面構造に依存した界面強度の照射温度,線量依存性を特定したが、その変化量に対しバルク強度特性の有意な劣化は認められなかった。本発表では、先進SiC/SiC複合材料の繊維-マトリックス界面の具体的な設計指針と今後の開発方針について報告する。

This study aims to identify the effect of neutron irradiation on the fiber/matrix interface of advanced SiC/SiC composites. A single fiber push-out test was applied to evaluate the shear properties at the interface. The results indicate that the interfacial shear strength depends significantly on the irradiation temperature and neutron dose up to 7.7 dpa at $$<$$1080$$^{circ}$$C. It is worth noting that no major deterioration of the bulk strength of the composites is expected by the slight decrease of interfacial shear properties. This paper will report the general guideline to design irradiation resistant fiber/matrix interface and critical issues for further development will be discussed.

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