Effect of Y2O3 and Sm2O3 on Sintering and Mechanical Behaviors of Alumina Ceramics
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：YAO Yijun QIU Tai JIAO Baoxiang
Key words：alumina; mechanical behavior; microstructure; rare earth oxide;
Abstract: The effects of Y2O3 and Sm2O3 doping on the sintering temperature, microstructure and mechanical behaviors of Al2O3 ceramics were investigated. The experimental results show that the sintering temperature can be decreased and the mechanical behavior can be improved by adding rare earth in alumina ceramics. The relative density of rare-earthdoped alumina ceramics reaches 98.8% after sintering at 1600 ℃ for 2 h, and its bending strength and fracture toughness reach 439 MPa and 5.28 MPa·m1/2,respectively.Introduction of Y2O3 and Sm2O3 in Al2O3 can restrain the growth of grains, refine the size of grains, and thus form a fine-grained structure. The fracture characteristic is the mixed modes of intergranular and transgranular fracture.
YAO Yijun1，QIU Tai1，JIAO Baoxiang1
(1.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China)
Abstract:The effects of Y2O3 and Sm2O3 doping on the sintering temperature, microstructure and mechanical behaviors of Al2O3 ceramics were investigated. The experimental results show that the sintering temperature can be decreased and the mechanical behavior can be improved by adding rare earth in alumina ceramics. The relative density of rare-earthdoped alumina ceramics reaches 98.8% after sintering at 1600 ℃ for 2 h, and its bending strength and fracture toughness reach 439 MPa and 5.28 MPa·m1/2,respectively.Introduction of Y2O3 and Sm2O3 in Al2O3 can restrain the growth of grains, refine the size of grains, and thus form a fine-grained structure. The fracture characteristic is the mixed modes of intergranular and transgranular fracture.
Key words:alumina; mechanical behavior; microstructure; rare earth oxide;
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