碳化硅料浆分散特性研究

Research on dispersion property of silicon carbide slurry

采用低分子量的聚乙烯亚胺作为分散剂,制备稳定性好的碳化硅水基悬浮液。着重分析pH值、分散剂含量、固相含量以及表面改性处理等因素对碳化硅悬浮液分散特性的影响,试验确定聚乙烯亚胺的最佳用量。对碳化硅粉体进行表面处理,使得碳化硅悬浮液最大固相含量体积分数从44%提高到54%(表观黏度小于1Pa·s)。

This paper prepared high concentrated aqueous suspensions of silicon carbide with good stability using low-weight polyethylene amine （PEI） as a dispersant,and put emphasis on the effects of the factors such as pH value, the content of additive ,solid content and pre-treat process on dispersion property of silicon carbide ceramics slurry. The optimal content of the polyethylene amine was determined, The maximum solid content of silicon carbide aqueous suspension was increased from 44vol% to 54 vol% （apparent viscosity 〈 1 Pa·s） through pre-treat processing of the powders.