SONG Jieguang ¹ DU Daming ¹ WANG Xiuqin ² WANG Weiyuan ¹ ZHANG Xiaoqiang ¹ WU Longbiao ¹ XU Bin ¹

JI Gangchang 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:The A1₂O₃-Y₂O₃-coated ZrB₂ composite powders prepared by co-precipitation were densified via the spark plasma sintering (SPS) and then their oxidation resistance at high temperature was tested. ZrB₂ powders must have better dispersibility for better coating effect. Effect of dispersants on the dispersibility of ZrB₂ powders is researched in this paper,and the results show ZrB₂ powders have better dispersibility when the dispersant is PMAA and its content is 2vol%. The research lays a foundation for synthesizing better-coated A1₂O₃-Y₂O₃ /ZrB₂ composite powders.

Keywords:zirconium diboride, dispersant, dispersibility, coating effect, high temperature ceramics