碳化硅基浆料的流变性能  

Rheological Property of SiC-based Slurry

作　　者：张智[1,2] 卢旭晨[1] 闫岩[1] 王体壮[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《过程工程学报》2010年第2期226-230,共5页The Chinese Journal of Process Engineering

基　　金：国家高技术研究发展计划(863)基金资助项目(编号:2008AA05Z418)

摘　　要：研究了pH值、分散剂硅溶胶添加量、固含量对SiC基陶瓷浆料流变性能的影响.结果表明,与分散在水中的陶瓷粉体的Zeta电位相比,分散在硅溶胶中的陶瓷粉体的等电点向酸性方向漂移,且Zeta电位的负值绝对值都增加,这是由于吸附在陶瓷粉体表面的带负电荷的硅溶胶胶粒改变了陶瓷粉体表面的电荷状态.当pH值为11左右、硅溶胶添加量为10%(ω)时,浆料的粘度和剪切应力最小,流动性最佳;固含量达69%(ω)时,浆料呈现较强的触变性.The effects of pH value,silica sol dispersant content and solid content on the rheological property of SiC-based ceramic slurry were investigated.The research results showed that Zeta potential of ceramic particles in silica sol changed significantly in comparison with that of ceramic particles in deionized water.This was caused by the adsorption of silica colloidal particles with negative charges on the surface of ceramic particles.Silica sol-dispersed slurry showed a minimum in viscosity and shear stress when pH value was around 11 and silica sol content 10%（ω）.The ceramic slurry showed high thixotropic behavior when solid content reached 69%（ω）.

关 键 词：硅溶胶 SIC 分散 粘度 流变学 

分 类 号：TQ021.1[化学工程]