大粒径氧化铝浆料的悬浮稳定性研究  

Stability of Suspension Prepared with Coarse Alumina Powders

作　　者：汪永清[1,2] 侯静鹏[1,2] 常启兵[1,2] 周健儿[1,2] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,江西景德镇333403 [2]江西省高校无机膜重点实验室,江西景德镇333001

出　　处：《陶瓷学报》2015年第5期506-510,共5页Journal of Ceramics

基　　金：科技部国际科技合作项目(编号:2011DFA52000)

摘　　要：根据Stoke公式,大粒径氧化铝颗粒的沉降速率较快易造成陶瓷浆料稳定性变差。本文提出在大粒径氧化铝颗粒的表面制备一层纳米氧化铝涂层,增加粉体的比表面积,进而增强粉体与分散剂和稳定剂的作用,提高浆料的稳定性。以平均粒径为5μm的不规则形状和球形α-Al2O3颗粒为研究对象,采用溶剂热法制备纳米涂层,研究了分散剂和稳定剂含量对修饰前后氧化铝浆料的稳定性的影响。结果表明:在粒径相似的条件下,比表面积高的粉体,与有机添加剂的作用力较强,得到的浆料的稳定性增加。因此,通过在大粒径粉体表面制备纳米涂层,增加粉体比表面积可以作为提高大粒径粉体浆料稳定性的一个有效方法。According to Stoke equation, a large settling velocity of coarse particles will result in the bad stability of a suspension. The irregular and global coarse alumina powders with the average particle size of 5μm were researched. To increase the suspension＇s stability, the increased specific surface area of the coarse particles is proposed to increase the interaction between the coarse powder and the added organic reagent through a nano alumina coating prepared on the coarse particles＇ surface. The nano coating was prepared by solvent thermal method. The effect of the content of the dispersant and the stabilizer on the stability of the alumina suspension was researched. The results show that the specific surface area of coarse alumina powders can be increased by the nano coating, which strengthens the interaction between the coarse powder and the added organic reagent. This is an effective way to increase the stability of the suspension prepared with coarse powder.

关 键 词：浆料 大粒径氧化铝 悬浮稳定性 纳米氧化铝涂层 沉降高度 

分 类 号：TQ174.4[化学工程—陶瓷工业]