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首页> 外文会议>International conference on high temperature cermic matrix composites >Processing and characterisation of silicon carbide fibre reinforced MoSi{sub}2-based composites
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Processing and characterisation of silicon carbide fibre reinforced MoSi{sub}2-based composites

机译：碳化硅纤维增强MOSI {SUB} 2基复合材料的处理与表征

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摘要

MoSi{sub}2 has a number of propenies which make it attractive as a matrix material for various high temperature aerospace, automotive and structural applications. However, the use of MoSi{sub}2 is currently limited by its low room temperaturefracture toughness and high temperature creep behaviour. Substantial improvements in mechanical properties are necessary for component reliability. Reinforcing MoSi{sub}2 with continuous fibres could achieve such improvements in mechanical properties.Fully dense continuous SCS-9 SiC fibre reinforced MoSi{sub}2-hased composites have been produced by a hot-pressing technique. The MoSi{sub}2 matrix was modified with sialon powder to minimise the thermal expansion mismatch with the Sic fibre, therebysuppressing the matrix cracking. The fibres were coated with a protective SiC CVD layer so prevent the formation of any phase at the fibre/matrix interface. Microstructural and EDS analyses of interfacial regions have shown that the SiC coating has beensuccessful in preventing any chemical interaction at the interface. The coating has heen responsible for a significant improvement in toughness of the composites.
机译：MOSI {SUB} 2具有许多议案，使其成为各种高温航空航天，汽车和结构应用的矩阵材料。然而，使用MOSI {SUB} 2目前受到其低室温韧性韧性和高温蠕变行为的限制。机械性能的大量改进是组件可靠性所必需的。具有连续纤维的增强MOSI {SUB} 2可以实现机械性能的这种改进。大致密的连续SCS-9 SiC纤维增强MOSI {SUB} 2- HAMED复合材料已经通过热压技术生产。用Sialon粉末改性MOSI {SUB} 2基质，以最小化与SiC纤维的热膨胀失配，从而最小化基质裂缝。用保护性SiC CVD层涂覆纤维，因此防止在纤维/基质界面处形成任何相。界面区域的微观结构和EDS分析表明，SiC涂层在防止界面处的任何化学相互作用方面具有良心。涂层具有血小孔，其负责复合材料的韧性的显着改善。

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