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本文通过 XRD,SEM,TEM 以及三点弯曲试验技术研究了 Al_2O_3-25 v.-%ZrO_2(2mol%Y_2O_3)-25v.-% SiCw(AZS)三元陶瓷复合材料的断裂特点和韧化机理。结果表明,该材料的载荷-位移曲线因晶须的反复阻止作用呈锯齿状,ZrO_2与 SiC 晶须同时起增韧作用,材料的良好韧性是 ZrO_2的相变增韧、微裂纹增韧和裂纹偏转与分枝增韧以及 SiC 晶须的裂纹桥接与拔出效应共同作用的结果,但其综合效果不是简单叠加。本文还建立了 ZrO_2-SiC_W 的复合韧化模型,并进行了讨论。
In this paper, the fracture characteristics and toughening mechanism of Al 2 O 3-25 v .-% ZrO 2 (2mol% Y_2O_3) -25v .-% SiCw (AZS) ternary ceramic composites were investigated by XRD, SEM, TEM and three-point bending test. The results show that the load-displacement curve of the material is jagged due to the repeated inhibition of whiskers, and the toughening effect of ZrO_2 and SiC whiskers at the same time. The good toughness of the material is the phase transformation toughening of ZrO 2, the toughening and cracking of microcracks Deflection and branch toughening and SiC whiskers crack bridging and pulling effect of the combined effect of the results, but its overall effect is not a simple superposition. In this paper, a composite toughening model of ZrO_2-SiC_W was also established and discussed.