Al₂O₃-ZrO₂ composite ceramics with different proportions were fabricated by isostatic compaction and sintered by the normal pressure sintering method. The effect of proportions on the microstructures, mechanical properties and sintering properties of Al₂O₃-ZrO₂ ceramics were investigated. The results show that as the volume fraction of ZrO₂ increases from 0% to 50%, the relative bulk density gradually decreases from 90% to 88.5% and the porosity increases from 0.182% to 0.197%, but the flexural strength increases from 291 to 423 MPa. In order to explain this “abnormal phenomenon”, a finite element method was applied to calculate the maximum tensile stress on the Al₂O₃-ZrO₂ grain interface under tensile condition for the first time. The results indicate that the maximum grain interface tensile stress (MTS) of the Al₂O₃-ZrO₂ composite gradually decreases from 148.18 to 96.89 MPa as the volume fraction of ZrO₂ increases from 25% to 100%, which may be the main reason for their progressive flexural strength of Al₂O₃-ZrO₂ composite from 320 to 604 MPa. In addition, the pure Al₂O₃ model has low MTS, and its ceramic material also has good sintering performance, but its flexural strength is worst compared to other Al₂O₃-ZrO₂ composite ceramics. This is due to the large sizes of defects generated by abnormal growth of Al₂O₃ particles.

采用等静压法制备了不同比例的Al ₂ O ₃ -ZrO ₂复合陶瓷，并采用常压烧结法进行了烧结。研究了配比对Al ₂ O ₃ -ZrO ₂陶瓷的微观结构，力学性能和烧结性能的影响。结果表明，作为ZrO ₂的体积分数从0％增加到50％，相对堆积密度从90％逐渐减少到88.5％，孔隙率从0.182％增加到0.197％，而抗弯强度从291 MPa增加到423 MPa。为了解释这种“异常现象”，首次采用有限元方法计算了拉伸条件下Al ₂ O ₃ -ZrO ₂晶粒界面上的最大拉伸应力。结果表明，随着ZrO ₂的体积分数的增加，Al ₂ O ₃ -ZrO ₂复合材料的最大晶界拉伸应力（MTS）从148.18 MPa逐渐降低至96.89 MPa。从25％增加到100％，这可能是Al ₂ O ₃ -ZrO ₂复合材料的抗弯强度从320 MPa逐渐提高到604 MPa的主要原因。此外，纯Al ₂ O ₃模型的MTS低，其陶瓷材料也具有良好的烧结性能，但与其他Al ₂ O ₃ -ZrO ₂复合陶瓷相比，其抗弯强度最差。这是由于Al ₂ O ₃粒子的异常生长而产生的缺陷大。