FANG Yihang ¹_, WANG Huanping ¹_, XU Shiqing ¹, XIE Hongyan ²_, WANG Jianwu ²

(1.(1.College of Materials Science and Engineering, China Jiliang University, Hangzhou Zhejiang 310018, China;2.Hangzhou Gaotao Technology Co., Ltd, Hangzhou Zhejiang 310018, China)

Abstract:The sintering behavior and microstructures of ZrO₂ ceramics doped with Ce02, MgO and Y₂O₃ have been investigated. The results showed that the cracks inZrO₂ bulks were not inhibited, although the grains could be refined and the volume densities increased with the increase of CeO₂.The addition of a proper amount of MgO was useful to inhibit the fracture propagation, and the Mg0-ZrO₂ ceramics could be sintered at 1450'C. However, the MgO addition could not refine the grains, and an excessive MgO addition would cause drastic ZrO₂ crystal grain growth. Compared with Ce02 and MgO, Y₂O₃ was the best stabilizer, which not only inhibited the fracture propagation, but also refined the grains of ZrO₂ceramics. The optimal Y₂O₃  doping amount was 3 mol%, and the Y203-ZrO₂ ceramics could be sintered at 1550'C.

Key words:Zr02; stabilizer; volume density; microstructure