Abstract：For the problem of micron-sized α-alumina powders dispersed in water suspension, the single factor test was used to study the effect of milling time，ultrasonic time on the dispersion of α-alumina powders in water suspension. The orthogonal test was used to study the effect of dispersant kinds, dispersant concentration and pH of suspension on the dispersion of micron-sized α-alumina powders. Absorbance of suspension was used to evaluate the dispersion of α-alumina powders. The results show the optimal dispersing conditions are that the milling time is 40 min, ultrasonic time is 20 min，mass fraction of sodium tripolyphosphate is 0.5% and pH of suspension is 10.

Keywords: micron-sized α-alumina powder; water suspension; dispersion; absorbance

中图分类号：TB383        文献标志码：A

文章编号：1008-5548(2015)01-0042-05

DOI:10.13732/j.issn.1008-5548.2015.01.009

收稿日期：2014-05-27， 修回日期：2014-06-12，在线出版时间：2015-03-02。

基金项目：国家自然科学基金项目，编号：51375237；江苏省自然科学基金项目，编号：1302070B；中国博士后基金项目，编号：2014M551587。

第一作者简介：夏保红（1988—），男，硕士研究生，研究方向为精密超精密加工技术。电话：15850507802，E-mail: xbh65@163.com。

通信作者简介：孙玉利 （1970—），男，博士，副教授，研究方向为精密超精密加工技术、现代表面工程技术。电话：025-84891686，E-mail：sunyuli@nuaa.edu.cn。