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采用先驱体浸渍法制备了 3种不同纤维增强的SiC基复合材料 ,观察、分析了材料的微观结构、界面成分以及相应的材料性能 .研究发现 :在制备过程中Si和O会逐渐从基体扩散到纤维中 ,并导致纤维性能的劣化 .M4 0JB碳纤维受损最严重 ,所制备材料性能最差 ;采用Hi-Nicalon纤维增强的SiC基复合材料具有最佳的性能 ,单向板弯曲强度达到 70 3.6MPa,断裂韧性达到 2 3.1MPa·m1/ 2 .
Three kinds of fiber-reinforced SiC matrix composites were prepared by the precursor impregnation method, and the microstructure, interface composition and the corresponding material properties were observed and analyzed.The results show that Si and O gradually diffuse from the matrix during the preparation Into the fiber, and lead to the deterioration of the fiber performance.M4 0JB carbon fiber damage the most serious, the worst performance of the prepared material; using Hi-Nicalon fiber reinforced SiC matrix composites with the best performance, the flexural strength of the unidirectional board reached 70 3.6MPa, fracture toughness reached 2 3.1MPa · m1 / 2.