碳化硅浓悬浮体的分散特性和流变性研究  

DISPERSION AND RHEOLOGICAL PROPERTY OF THE CONCENTRATED SiC SUSPENSION

作　　者：易中周[1] 黄勇[1] 谢志鹏[1] 马景陶[1] 

机构地区：[1]清华大学材料科学与工程系

出　　处：《硅酸盐学报》2002年第4期517-520,共4页Journal of The Chinese Ceramic Society

基　　金：国家 973重大基础研究项目 (G2 0 0 0 0 672 0 4-0 1)~~

摘　　要：通过对碳化硅粉体在有机单体介质中的Zeta电位、分散剂用量和浓悬浮体的粘度等的测试及其沉降试验 ,详细研究了粒径分布较宽的碳化硅粉体 (0 .2～ 2 5 0 μm)的胶体分散特性、沉降行为以及浓悬浮体的流变行为。结果表明 ,选用适量的分散剂四甲基氢氧化铵可使SiC颗粒的Zeta电位绝对值提高近 2 0mV ,调整浆料pH至 11.9附近可制备出固相体积分数高达 70 %的SiC浓悬浮体。该浓悬浮体中粗细SiC颗粒间能达到均一稳定的分散 ,悬浮粒子不会产生明显地沉降 ,其流变行为符合Quemada模型。The dispersion and sedimentation of SiC powders (0.2-250 μm) in an organic medium and the rheological behavior of the suspensions were investigated by the measurements of Zeta potential, sedimentation and viscosity. The results show that the increment of absolute value of 20 mV Zeta potential can be achieved with a proper amount of the dispersant and a concentrated suspension with 70% solid volume can be obtained when the pH value of the suspensions is adjusted to about 11.9. The SiC powders are dispersed stably in the suspension with no obvious sedimentation. The rheological behavior of the concentrated SiC suspension follows the Quemada model.

关 键 词：碳化硅 溶悬浮体 分散特性 流变性 研究 陶瓷粉体 沉降行为 

分 类 号：TQ174.758[化学工程—陶瓷工业]