用真空烧结方法制备了Al2O3/ZrO2(Y2O3)复合材料，分析了ZrO2 (3Y)和ZrO2 (2Y)含量对Al2O3基陶瓷抗弯强度、断裂韧性的影响。用XRD定量分析了含摩尔分数2%与3% Y2O3的ZrO2 (2Y)与ZrO2 (3Y) 在断裂过程中四方相转变成单斜相的相变量,用以阐明增韧机制。结果表明，在ZrO2含量为15%（体积分数）时, Al2O3/ZrO2 (3Y)和Al2O3/ZrO2 (2Y)复合材料的抗弯强度、断裂韧性分别达到825 MPa，7.8 MPam1/2和738 MPa,6.7 MPam1/2，两者的性能差异主要来自不同的增韧机制。
The effect of the contents of ZrO2(3Y) and ZrO2(2Y) on the mechanical properties of the Al2O3/ZrO3(Y2O3) composites prepared by vacuum sintering has been studied. The change of m--ZrO2 and t-ZrO2 contents before and after fracture was detarmined by X-ray diffraction phase analysis, which is related to the toughening mechanism. When the content of ZrO2 is 15% (volume frection), the bending strength and fracture toughness of Al2O3/ZrO2(2Y) composite are 738 MPa and 6.7 MPa.m1/2, respectively, while those of the Al2O3/ZrO2(3Y) composite are 825 MPa and 7.8 MPa.m1/2, respectively. The difference in mechanical properties is due to the operation of different toughening mechanisms.
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