SiC_w／ZTA（Y）陶瓷基复合材料断裂特性的研究

STUDY ON FRACTURE CHARACTERISTICS OF SiC_w/ZTA(Y)CERAMIC MATRIX COMPOSITES

本文研究了一种新型的陶瓷基复合材料－ＳｉＣ晶须补强ＺＴＡ（Ｙ）陶瓷材料的断裂特性．分析表明，复台材料基体以解理断裂为主，沿晶断裂出现在晶粒粗大的场合．断裂过程中发生了ＺｒＯ２（ｔ）→ＺｒＯ２（ｍ）的马氏体相交．断裂时晶须的拔出是明显的，晶须引入基体的张应力将使裂纹扩展途径更为曲析，这都将有利于复合材料断裂韧性的增加．

In this paper, fracture characteristics of a new type of ceramic matrix composite, that is SiC whisker reinforced ZTA (Y) have been stUdied. Analyses indicate that cleavage fractures are main way in the composite matrix, fractures along grain boundary occur in larger grains of the matrix. ZrO2(t) martensitic phase transformation to ZrO2(m) occurs in process of the fracture. Whiskers pullout are visible. The tensile stress introduced by the whisker makes crack growth way more complex. All of the above are assistant to increase fracture toughness of the ceramic matrix composite.