标题：Fabrication of high-performance Y2O3 stabilized hafnium dioxide refractories
作者：Zhao, Jiaxing;Zhang, Yujun;Gong, Hongyu;Zhang, Yubai;Wang, Xianli;Guo, Xue;Zhao, Yujun
作者机构：[Zhao, J] Key Lab. for Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, Shandong University, Jinan, 250061, Chi 更多
通讯作者地址：[Zhang, YJ]Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China.
关键词：Hafnium dioxide;Y2O3 stabilized;High-performance refractory
摘要：Y2O3 stabilized HfO2 ceramics with 5 mol% and 8 mol% Y2O3, respectively, were successfully fabricated by pressureless sintering at 1600 degrees C for 1 h. The phase distribution and transformation, microstructure, and relative density were investigated for Y2O3 stabilized HfO2 ceramics. Cubic phase was observed in the Y2O3 stabilized hafnium dioxide while pure HfO2 showed monoclinical phase only. The SEM images of fractured surface indicated two kinds of structures existed in modified HfO2 the solid solution region and uniform polygon grains, and some holes caused by Kirkendall effect. Refractoriness test showed that high temperature volumetric stability of the material can be effectively enhanced by adding Y2O3 into HfO2. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.