摘要
采用氧化铝粉为原料、MgO为添加剂、两步烧结工艺制备氧化铝陶瓷,并分析添加剂的变化对氧化铝陶瓷致密度、力学性能和微观组织的影响规律。结果表明:当烧结温度T1=1 450℃、保温时间t1=10 min、烧结温度T2=1 375℃、保温时间t2=5 h,MgO添加量为0.5%时,晶粒细小,晶粒分布均匀,但致密度差;当MgO含量为0.25%时,平均粒径最小,晶粒分布较集中,致密度接近理论值;当MgO添加量达到0.01%时,相对密度和力学性能最好,但晶粒粗大,晶粒分布不均匀。因此当MgO含量为0.25%时,通过两步烧结工艺制备的氧化铝陶瓷性能最佳。
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.
作者
王旭东
暴红星
魏子良
王永军
张凤鸣
WANG Xudong;BAO Hongxing;WEI Ziliang;WANG Yongjun;ZHANG Fengming(Equipment Maintenance Center, Shenhua Shendong Coal Group Co., Ltd., Yulin 719315,China)
出处
《铸造技术》
CAS
2019年第6期547-551,共5页
Foundry Technology
关键词
氧化铝陶瓷粉
两步烧结
烧结性能
致密度
alu mina powders
two-step sintering
sintering characteristics
density
