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Effects of Y₂O₃ on Thermal Shock of Al₂O₃/TiCN Composites

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【Author】 Qiu Guanming 1,2*, Li Xikun 2, 3, Xiu Zhimeng4, Sun Xudong 4, Yan Changhao 2, Dai Shaojun 2(1. Changchun University of Science and Technology, Changchun 130022, China; 2. Nanjing University of Technology, Nanjing 210009, China; 3 Shenyang University of Science and Technology, Shenyang 110168, China; 4. Northeastern University, Shenyang 110004, China)

【机构】 Changchun University of Science and Technology, Changchun 130022, China； Nanjing University of Technology, Nanjing 210009, China,Nanjing University of Technology, Nanjing 210009, China,Shenyang University of Science and Technology, Shenyang 110168, China,Northeastern University, Shenyang 110004, China,Northeastern University, Shenyang 110004, China,Nanjing University of Technology, Nanjing 210009, China,Nanjing University of Technology, Nanjing 210009, 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.更多还原

【关键词】 composite； Al2O3-30%TiCN-0.2%Y2O3； thermal shock； bending strength； work of fracture； rare earths；
【Key words】 composite； Al2O3-30%TiCN-0.2%Y2O3； thermal shock； bending strength； work of fracture； rare earths；

【基金】 theNationalNaturalScienceFoundationofChina (5 0 172 0 10 )andtheNaturalScienceFoundationofLiaoningProvince (2 0 0 110 10 0 2 )

【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2005年03期

【分类号】TQ174.75
【被引频次】5
【下载频次】98

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Effects of Y2O3 on Thermal Shock of Al2O3/TiCN Composites

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Effects of Y₂O₃ on Thermal Shock of Al₂O₃/TiCN Composites