微米α-Al_2O_3粉体的细化及其悬浮液的分散稳定性

在微米α-Al2O3粉体悬浮液中分别加入无机电解质类分散剂六偏磷酸钠、阳离子型表面活性剂十六烷基三甲基氯化铵、阴离子型表面活性剂油酸和非离子型表面活性剂异丙醇胺,并对悬浮液进行球磨分散,研究分散剂加球磨复合分散下的最优分散剂及最佳球磨参数;引入超声分散,对比分析在加入分散剂的情况下,先球磨再超声和只进行球磨时的分散效果。结果表明,采用十六烷基三甲基氯化铵为分散剂,先球磨2 h再超声分散15 min的分散效果最好,沉降24 h后的悬浮率为62%左右,平均粒径为243 nm。

Refining of Micro-sized α-Al2O3 Powders and Dispersion Stability of Their Suspensions

Inorganic electrolyte type dispersing agent sodium henamephosphate,cationic surfactant cyltrimethylammonium chloride,anionic surfactant oleic acid and nonionic surfactant diisopropanolamine were mixed into the micro-sized α-Al2O3 powders suspensions which was then ball milling dispersed.The best dispersing agent and ball milling parameters were studied under the conditions of dispersing agent and ball milling compounding dispersion.Introducing ultrasonic dispersion and mixing into dispersing agents,dispersion effects of ball milling-ultrasonic and ball milling only were comparatively analyzed.The results show that the best dispersion effects can be achieved by milling for 2 h and then ultrasonic dispersing for 15 min with cyltrimethylammonium chloride as the dispersing agent.The suspensive ratio of the suspensions can reach about 62% after settling for 24 h and the average diameter of the particles is 243 nm.