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首页> 外文期刊>材料 >Material Design for High Strength and Toughness of Continuous SiC Fiber-Reinforced Reaction Sintered SiC Matrix Composite
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Material Design for High Strength and Toughness of Continuous SiC Fiber-Reinforced Reaction Sintered SiC Matrix Composite

机译：连续SiC纤维增强反应烧结SiC基复合材料高强韧性材料设计。

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摘要

It is well-known that dense SiC matrix composites reinforced by SiC fibers with BN coating can be fabricated by subsequent reaction sintering with molten Si. In this experiments, it was confirmed that the mechanical properties of continuous Si-C fibers (Hi-Nicalon) were not affected by the thickness of the BN coating using CVD process and the bending strength of reaction-sintered SiC increased from 500 to 1000MPa with decreasing the size of residual silicon. The effect of SiC matrix strength on the matrix cracking stress in unidirectional fiber-reinforced SiCf/SiC composites was investigated by use of these data. As a result, it made clear that the matrix cracking strength in SiCf/SiC composites increased with increasing the SiC matrix strength. There are the upper limits of the SiC matrix strength deduced from the SiC fiber strength and the fiber volume fraction to achieve the apparent ductile fracture of the SiCf/SiC composites.
机译：众所周知，可以通过随后与熔融Si的反应烧结来制造由具有BN涂层的SiC纤维增强的致密SiC基复合材料。在该实验中，证实了连续Si-C纤维（Hi-Nicalon）的机械性能不受使用CVD工艺的BN涂层厚度的影响，并且反应烧结SiC的弯曲强度从500MPa增加到1000MPa。减少残留硅的尺寸。利用这些数据研究了SiC基体强度对单向纤维增强SiCf / SiC复合材料中基体开裂应力的影响。结果表明，SiCf / SiC复合材料的基体开裂强度随着SiC基体强度的增加而增加。由SiC纤维强度和纤维体积分数得出的SiC基体强度存在上限，以实现SiCf / SiC复合材料的表观韧性断裂。

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