氧化锆粉末的表面改性研究  

the Study on Surface Modification of Zirconia Powder

作　　者：王文利[1] 李笃信[1] 李昆[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《硬质合金》2007年第4期198-202,共5页Cemented Carbides

基　　金：湖南省自然科学基金资助项目(06JJ20036)

摘　　要：采用表面改性剂C对ZrO2粉末表面进行改性处理,制备出了有机/无机包覆的陶瓷粉末。研究了表面改性对粉末粒度和粒度分布的影响,利用SEM观察了表面改性前后粉末的团聚和微观形貌,测试了不同改性剂含量粉末的沉降时间和润湿接触角。研究结果表明:(1)超声波分散时间越长,粉末的中位径粒度越小;(2)改性粉末在二甲苯溶液中的粒度减小,团聚度降低;(3)粉末在二甲苯溶液中的沉降时间快慢为:to<<t0.5%C<t3%C=t5%C,润湿接触角大小为:θo>>θ0.5%C>θ3%C≈θ5%C,改性粉末在非极性溶液中的分散性、稳定性和润湿性得到明显提高。Organic/inorganic coating ceramic powders were prepared by applying surface modifying reagent C to modify the zirconia powder surface. The effect of surface modification on the particle size and particle size distribution was studied, the agglomeration and microstructure of the unmodified and modified powder were measured by SEM, the sedimentation times and wetting contact angles with different content modifying reagent were tested. The results show that, 1） the longer ultrasonic time is, the smaller the median diameter particle size becomes ; 2） the particle size of the modified powder in the dimethylbenzene solution decreases, the agglomeration of the modified powder reduces; 3） the sedimentation time of the powder in the dimethylbenzene is as follows： t0〈〈t0.5%〈t3%c=t5%c and the wetting contact angle of the powder with dimethylbenzene are as follows： θ〉〉θ0.5%c〉θ3%c≈θ5%c The dispersion, stability and wettability of the modified powder have been enhanced evidently in the nonpolar solvent.

关 键 词：氧化锆粉末 表面改性 陶瓷注射成形 团聚 润湿接触角 

分 类 号：O614.412[理学—无机化学]