Effects of Rare Earth Oxides on the Microstructure and the Mechanical Properties of High-Purity Alumina Ceramics Sintered at Low Temperature
High-purity alumina ceramics were prepared by sintering at low temperature,using rare earth oxide Y2O3 and Tm2O3 as sintering aids.Adding the mixture of Y2O3 and Tm2O3 in the alumina powders can effectively improve the sintering ability and mechanical properties.The mixture,Y2O3+Tm2O3,can restrain the grains growth,fine the grain size,make the grain uniform and finally help to form compact structure.The transgranular fracture was the main fracture mode.It was found the relative density of alumina ceramics with 0.3wt% Y2O3 and Tm2O3,sintered at 1620℃ for 3hrs,can be over 99.2% and the strength,toughness and microhardness reach 533.1MPa,4.9MPa.m1/2 and 17.2GPa,respectively.
Alumina Rare earth oxide Sintering Microstructure
Feng Sun Ting-yan Tian Wei-ru Zhang Bo Chen
Beijing Sinoma Research Institute of Synthetic Crystals,Beijing,100018,China Shandong Research & Design Institute of Industrial Ceramics,Zibo 255031,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
694-696
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）