高压烧结高纯微晶氧化铝陶瓷(英文)  

HIGH-PRESSURE SINTERING OF MICROCRYSTALLINE AND HIGHLY PURIFIED ALUMINA CERAMIC

作　　者：滕元成[1] 孙致平[1] 唐敬友[1] 陈堃[1] 齐晓敏[1] 鲁伟员[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]四川艺精长运超硬材料有限公司,四川绵阳621010

出　　处：《硅酸盐学报》2007年第8期968-972,共5页Journal of The Chinese Ceramic Society

基　　金：四川省教育厅重点(2006A102)资助项目

摘　　要：以商业生产的高纯纳米α-Al2O3粉(99.9%,质量分数)、分析纯 Mg(NO3)2为原料,以两面顶压机高压烧结,制备了纯Al2O3陶瓷及微量MgO掺杂的 Al2O3陶瓷,并进行了密度测试与显微结构分析。与常压烧结相比,高压烧结可显著降低高纯Al2O3陶瓷的烧结温度,提高传质速率,大幅度缩短烧结时间,达到快速、低温烧结的效果。与常压烧结明显不同,在高压烧结时,MgO 对高纯Al2O3陶瓷的烧结致密化几乎没有影响。在 4.5GPa,1100 ℃高压烧结30min,制备的纯Al2O3 陶瓷的相对密度为97.65%,微量MgO掺杂的Al2O3 陶瓷的相对密度达97.93%、平均晶粒尺寸约为4μm。Pure Al2O3 ceramic and MgO-doped Al2O3 ceramic were prepared by high-pressure sintering, using a commercially available alpha-alumina nanopowder with a purity of 99.9% in mass and Mg（NO3）2 （analytical reagent） as the starting materials. These ceramics were characterized by density measurement and microstructure analysis. The sintering temperature of the highly purified Al2O3 ceramic decreases remarkably in the high-pressure sintering, as compared with the normal-pressure sintering, and the velocity of mass transfer also enhances, which shortens the sintering time. The high-pressure sintering can achieve fast- and low-temperature sintering. MgO has no effect on the densification of the highly purified Al2O3 ceramic in the high-pressure sintering process, which is obviously different than that in the normal sintering. The pure Al2O3 ceramic, with a relative density of 97.65%, and MgO-doped Al2O3 ceramic, with a relative density of 97.93% and an average grain size of 4μm, were obtained by sintering for 30 minutes under a pressure of 4.5 GPa and a temperature as low as 1 100℃.

关 键 词：纳米 氧化铝 高压烧结 氧化镁 

分 类 号：TQ174[化学工程—陶瓷工业]