中文摘要：

将Ag粉和Al2O3粉按不同配比（体积分数，下同）配制后进行高能球磨，然后烧结。研究不同Ag含量对试样烧结性能与断裂韧性的影响。结果表明，高能球磨可使颗粒细化。由于粒子尺寸细小，具有较高的表面能，使得试样的烧结温度明显降低。并且第二相Ag粒子的添加也可明显降低试样的烧结温度，但同时也不同程度地降低了试样的相对密度。Ag粒子的添加量对试样的断裂韧性有较大影响。当Ag含量从0％增加到5％时，断裂韧性也随之增大，当Ag含量为5％时，试样的断裂韧性达到最大值5．12MPa·m^0.5。当Ag含量从5％增加到10％时，由于相对密度急剧降低，使得试样的断裂韧性也随之明显降低。

英文摘要：

The powders with different ratios of Al2O3 to Ag were prepared by mechanical alloying （MA）. The influences of different contents of Ag on sintering and fracture toughness were investigated. The results showed that the powder particle sizes could be reduced by MA. The sintering temperature of Al2O3/Ag was decreased due to the fine particles and Ag. Furthermore, the densification was decreased with the increase of Ag content. When the sintering temperature was about 1150℃-1200℃, the Al2O3/5%/Ag sample had the maximum fracture toughness of 5.12 MPa·m^05.