MA Zhixin 1, HAN Yanling 1, WANG Baowu 2
(1. School of Materials Science and Engineering,Shenyang University of Technology, Shenyang, Liaoning 110870; 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072)
Abstract: Two influence factors-the sintering technology and the adding content of alumina are observed to analyze the cracking phenomenon of zirconia-alumina composite ceramic grains in the sintering process. The ZrO2+Al2O3 composite ceramic has been obtained after mixing materials, ball -milling, forming by dry pressing and then isostatic pressing, and pressureless sintering at 1540℃ ~1650℃ . Microstructure of the ceramics was examined by scanning electron microscope, and compositions by EDS of SEM. Research results show that grain crack appears when sintering at 1630℃ with the presence of 45% alumina. The Microstructure of the composite ceramic can be uniform and dense when it's sintered below 1600℃.
Key words: grain crack; zirconia; microstructure