Thermal Shock Resistance of Al2O3/ZrO2 (Y2O3 ) Composites
ZrO2 containing 2％ (mol fraction) Y2O3 and 3％ (mol fraction) Y2O3 were added into Al2O3 matrix, compositing composites with 15％ volume fraction of addictives mentioned above. The testing of property and analysis of SEM presented that, after vacuum sintering at 1550 ℃, thermal shock resistance of two composites was superior to Al2O3 ceramic.The experiment showed that the properties of Al2O3 composites was higher than Al2O3 ceramic, and Al2O3/ZrO2(3Y) was higher than Al2O3/ZrO2(2Y) in thermal shock resistance. Improvement of thermal shock resistance of composites was attributed to many toughness machanisms of ZrO2(Y2O3). By calculation, the fracture energy of Al2O3, Al2O3/ZrO2(2Y) and Al2O3/ZrO2(3Y) was 38100.8 and 126.2 J·m-2, respectively. Cracks initiation resistance (R) of Al2O3/ZrO2(3Y) and Al2O3/ZrO2(2Y) was higher than Al2O3 ceramic by 1.57 and 1.41 time, respectively, and cracks propagation resistance (R) was higher than Al2O3 ceramic by 1.46 and 1.38 time, respectively, which was corresponding to the results of residual strength.
fracture energy transformation toughness Al2O3/ZrO2 (Y2O3 ) composites thermal shock resistance inorganic non-metallic material rare earths
Ma Weimin Wen Lei Sun Xudong Cui Tong Qiu Guanming
Department of Materials Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang Shenyang National Laboratory for Materials Science, Institute of Metal Research, The Chinese Academy Institute of Materials and Metallurgy, Northeastern University,Shenyang 110044, China Changchun University of Science and Technology, Changchun 130022, China
国际会议
海口
英文
53-57
2006-11-13（万方平台首次上网日期，不代表论文的发表时间）