SONG Jieguang ¹ WANG Xiuqin ² WANG Weiyuan ¹

ZHANG  Xiaoqiang ¹ MA  Yonghong ¹ WU Longbiao ¹ WUTing ¹ ZHANG  Lianmeng ³

(1. School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005; 2. Library of Jiujiang University,

Jiujiang 332005; 3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology, Wuhan 430070)

Abstract:Because ZrB₂ has some excellent physical performance and chemical stability, it has been widely applied in a lot of fields, but ZrB₂ is too difficult to be densified during sintering and easy to be oxidized at high temperature. To keep advantages and improve disadvantages of ZrB₂, A1₂O₃-Y₂O₃/ZrB₂ composite powders with shell-core structure are prepared by co-precipitation, and then high density ZrB₂-YAG ceramics are prepared by spark plasma sintering. Young's modulus and fracture toughness of ZrB₂-YAG ceramics are increased by increasing sintering temperature from 1300℃ to 1700℃.

Keywords:ZrB₂, YAG, shell-core structure, co-precipitation method, spark plasma sintering