摘要
为降低氧化铝陶瓷膜支撑体的烧结温度,采用溶剂热法在α-Al2O3(平均粒径为40μm)颗粒的表面制备一层纳米氧化铝涂层。采用SEM、TEM、万能材料测试仪、压汞仪等表征所得烧结α-Al2O3陶瓷膜支撑体。结果显示:纳米氧化铝涂层均匀地分布在α-Al2O3颗粒表面,起到明显地助烧结作用。这种助烧结作用随纳米氧化铝涂层厚度的增加而增加,但对氧化铝颗粒"颈部"的增加作用较小。通过添加α-Al2O3(平均粒径为1μm)的氧化铝,能有效增加氧化铝颗粒的颈部半径。异丙醇铝:Al2O3(1μm,10 wt%;40μm,90 wt%)=1∶5(质量比),1650℃煅烧2 h,所得陶瓷膜支撑体的弯折强度为20.16 MPa,孔隙率为30.6%,孔径为6.6μm。
To decrease the sintering temperature of alumina ceramic membrane supports, nanometer alumina coating was prepared on the surface of α-Al2O3 grains （average particle diameter of 40 ~ m） by solvo-thermal method. The obtained samples were characterized by SEM, TEM, universal material tester and autopore instrument. The results showed that nanometer alumina coating was evenly distributed on the surface of α-Al2O3 grains, which has the obvious sintering-aid effect. This effect increases with the increase of nano alumina coating thickness. However, the thickness of nano alumina coating has less effect on the increase of alumina particles＇ ＂neck＂. The radius of the neck of the alumina grains can effectiveIy increase by adding α-Al2O3 （average particle diameter of 1 μm）. The ceramic membrane support calcinated at 1650 ℃ /2h, which has the composition of isopropanol aluminum：Al2O3 （1μm, 10wt%; 40μm, 90wt% ）- 1 ： 5 （mass ratio）, has the bending strength of 20.16MPa, the porosity of 30.6% and the pore size of 6.6 μm.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2013年第10期9-12,16,共5页
China Ceramics
基金
国家自然科学基金(51062006)
教育部重点项目(211092)
科技部国际科技合作项目(2012DFA52000)
关键词
陶瓷膜支撑体
助烧结剂
纳米氧化铝
弯折强度
Ceramic membrane support
Sintering-aid
Nanometer alumina
Bending strength
