Effect of Nb2O5/La2O3 Additions on Mechanical Properties of Al2O3 Ceramics Prepared by Microwave Sintering
The influence of Nb2O5 and La2O3 on the phase and microstructure evaluation and mechanical properties of composite ceramics sintered with 2.45 GHz microwave energy was investigated.The results showed that Nb2O5 could densify the pure alumina with a lower sintering temperature and a short sintering time.Nb2O5 reacted with Al2O3 to form AlNbO4 completely and the amount of AlNbO4 increased with the increasing content of Nb2O5,distributing at the Al2O3 grain boundaries.The specimen doped with 10 Vol.% Nb2O5 sintered at 1500 ℃ exhibited plenty of columnar grains with draw ratio about 1∶3.La2O3 reacted with Al2O3 to form LaAl11O18 completely,the specimen doped with 10 Vol.% and 15 Vol.% La2O3 sintered at 1500 ℃ exhibited plenty of columnar grains with draw ratio about 1∶4.The existence of columnar grains enhanced the microhardness and fracture toughness of composite ceramics.
microwave sintered Al2O3 Nb2O5 La2O3 columnar crystals
Yunlong Ai Nan Jiang Fei He Bingliang Liang Wen He
College of Materials Science and Engineering,Nanchang Hangkong University,Nanchang,Jiangxi Province,330063,China
国际会议
景德镇
英文
281-285
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）