Al₂O₃/Er₃Al₅O₁₂(EAG)/ZrO₂ ceramics with eutectic composition were prepared with hot-pressing sintering and melt growing. The samples were divided into four sets, non-directionally solidified eutectic ceramics (N-DSEC), directionally solidified eutectic ceramics (DSEC), rapidly quenched eutectic ceramics (RQEC) and hot-pressing sintered ceramics (HPSC), respectively. The relationship between their microstructures and mechanical properties was investigated. The results show that RQEC has the highest hardness of 17.3 GPa, HPSC has the highest fracture toughness of 6.8 MPa m^1/2, while DSEC has the highest flexural strength of 721.8 MPa. The increase of density, the improvement of microstructural uniformity and the decrease of defects are beneficial to the mechanical properties of the samples. The refinement of microstructure can increase the hardness, but not significantly within a certain range of solidification rate. The fracture toughness increases with the interface amount at the low growth rate. However, but too fast solidification rate may produce excessive residual stress and amorphous structure in the samples, and decrease the fracture toughness. In addition, the reasonable weakening of interface bonding strength could improve the fracture toughness of Al₂O₃/EAG/ZrO₂ ceramics with high density. However, the weakened interface at the sample surface is inclined to become the starting point of failure, which is harmful to the flexural strength.

通过热压烧结和熔体生长制备了具有共晶成分的Al ₂ O ₃ / Er ₃ Al ₅ O ₁₂（EAG）/ ZrO ₂陶瓷。将样品分为四组，分别为非定向凝固共晶陶瓷（N-DSEC），定向凝固共晶陶瓷（DSEC），快速淬火共晶陶瓷（RQEC）和热压烧结陶瓷（HPSC）。研究了它们的微观结构和力学性能之间的关系。结果表明，RQEC的最高硬度为17.3 GPa，HPSC的最高断裂韧性为6.8 MPa m ^1/2，而DSEC的最高抗弯强度为721.8 MPa。密度的增加，微观结构均匀性的改善和缺陷的减少有利于样品的机械性能。微结构的细化可以增加硬度，但是在一定的凝固速率范围内不能显着提高硬度。在低生长速率下，断裂韧性随着界面量的增加而增加。但是，太快的凝固速度可能会在样品中产生过多的残余应力和非晶态结构，并降低断裂韧性。另外，合理降低界面结合强度可以提高Al ₂ O ₃ / EAG / ZrO ₂的断裂韧性。高密度陶瓷。但是，样品表面的薄弱界面倾向于成为破坏的起点，这对挠曲强度有害。