Effects of MgO Addition and Sintering Temperature on Sintering Properties of Alumina Ceramics
Author of the article:WANG Xudong;BAO Hongxing;WEI Ziliang;WANG Yongjun;ZHANG Fengming
Author's Workplace：Equipment Maintenance Center, Shenhua Shendong Coal Group Co., Ltd., Yulin 719315,China
Key Words：alu mina powders two-step sintering sintering characteristics density
Abstract：
Alumina ceramics were prepared by two-step sintering process with alumina powder as raw material and MgO as additive,and the effects of the changes of additives on the density,mechanical properties and microstructure of alumina ceramics were analyzed.The results show that when the sintering temperature T1 is 1 450℃,holding time t1 is 10 min,T2 is 1 375℃,holding time t2 is 5 h,MgO style content is 0.5%,grain fine and uniform grain size distribution,but the density is low;When the content of MgO is 0.25%,the average particle size is the smallest and the grain distribution is relatively concentrated,so the density is close to the theoretical value.When the MgO content reach 0.01%,the relative density and mechanical properties are the best,but the grain size is large and the grain distribution is not uniform.Therefore,when the content of MgO is 0.25%,alumina ceramics prepared by two-step sintering process have the best performance.
