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研究了SiCw/Y—TZP/Al_2O_3系复合陶瓷的显微结构及其力学性能,通过透射电镜拉伸试样中的裂纹扩展形态与组织变化,分析了晶须与ZrO_2相变增韧机制。结果表明,陶瓷体内各相结合致密,分布较为均匀,其室温强度和断裂韧度分别为1100MPa和11.9MPa.m~(1/2),晶须拔出,裂纹偏转及ZrO_2t—m相变是该复合材料的主要增韧机制。SiC晶须和Y—TZP的共同作用,对复合材料强度和断裂韧性的提高具有叠加或协同效应。
The microstructure and mechanical properties of SiCw / Y-TZP / Al_2O_3 composite ceramics were studied. The crack growth morphology and microstructure of the samples were analyzed by transmission electron microscopy. The mechanism of phase transformation and toughening between whiskers and ZrO_2 was analyzed. The results show that all the phases in the ceramic body are densely packed and the distribution is uniform. The room temperature strength and fracture toughness are 1100MPa and 11.9MPa.m ~ (1/2), respectively. Whisker pull-out, crack deflection and ZrO_2t- The main toughening mechanism of the composite. The synergistic effect of SiC whiskers and Y-TZP has additive or synergistic effect on the strength and fracture toughness of composites.