Effects of Y2O3 on Thermal Shock of Al2O3/TiCN Composites
来源期刊：JOURNAL OF RARE EARTHS2005年第3期
论文作者：Yan Changhao Li Xikun Xiu Zhimeng SUN Xudong QIU Guanming Dai Shaojun
Key words：composite; Al2O3-30％TiCN-0.2％Y2O3; thermal shock; bending strength; work of fracture; rare earths;
Abstract: Thermal shock resistance of Al2O3-TiCN(30%)-Y2O3(0.2%) composite was studied by hot pressing(HP) method at different temperatures. The study shows that thermal shock resistance of the material is determined by its microstructure and reinforced mechanism. According to SEM and calculation of thermal shock, the fractured surface of Al2O3-30%TiCN-0.2%Y2O3 composite is undulate. The residual strength of Al2O3-30%TiCN-0.2%Y2O3 is higher than Al2O3-30%TiCN at 200～800 ℃ after thermal shock. Cracks initiation resistance (R')and cracks propagation resistance (R″″)of Al2O3-30%TiCN-0.2%Y2O3 composite increases 12% and 5% respectively compared with that of Al2O3-30%TiCN. It matches with experimental results. The addition of Y2O3 forms YAG that inhibits crystal growth, and increases fracture stress, fracture toughness, cracks initiation resistance and cracks propagation resistance. Therefore, thermal shock resistance increases. The fracture work of Al2O3-30%TiCN and Al2O3-30%TiCN-0.2%Y2O3 composites are 132 and 148 J·m-2 respectively.
Yan Changhao1，Li Xikun1，Xiu Zhimeng3，SUN Xudong3，QIU Guanming4，Dai Shaojun1
(1.Nanjing University of Technology, Nanjing 210009, China;
2.Shenyang University of Science and Technology, Shenyang 110168, China;
3.Northeastern University, Shenyang 110004, China;
4.Changchun University of Science and Technology, Changchun 130022, China)
Abstract:Thermal shock resistance of Al2O3-TiCN(30%)-Y2O3(0.2%) composite was studied by hot pressing(HP) method at different temperatures. The study shows that thermal shock resistance of the material is determined by its microstructure and reinforced mechanism. According to SEM and calculation of thermal shock, the fractured surface of Al2O3-30%TiCN-0.2%Y2O3 composite is undulate. The residual strength of Al2O3-30%TiCN-0.2%Y2O3 is higher than Al2O3-30%TiCN at 200～800 ℃ after thermal shock. Cracks initiation resistance (R'')and cracks propagation resistance (R″″)of Al2O3-30%TiCN-0.2%Y2O3 composite increases 12% and 5% respectively compared with that of Al2O3-30%TiCN. It matches with experimental results. The addition of Y2O3 forms YAG that inhibits crystal growth, and increases fracture stress, fracture toughness, cracks initiation resistance and cracks propagation resistance. Therefore, thermal shock resistance increases. The fracture work of Al2O3-30%TiCN and Al2O3-30%TiCN-0.2%Y2O3 composites are 132 and 148 J·m-2 respectively.
Key words:composite; Al2O3-30％TiCN-0.2％Y2O3; thermal shock; bending strength; work of fracture; rare earths;
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