PAN Liji, YE Fei , GUO Lucun

(College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009)

Abstract: Effect of polyvinylpyrrolidone on rheology of aqueous SiC suspensions stabilized with polyepoxysuccinic acid was investigated. The results showed that low dosage of binary dispersant was able to enhance the dispersion of SiC suspension at pH 9.0. When the total amount of dispersant was 0.4wt% and the ratio of PESA to PVP was 3:1, the slurry obtained the lowest viscosity. With 40vol% solid loadings, SiC suspensions with PESA were completely flocculated, while those with the co-addition of PESA and PVP were well dispersed. In addition, adding PESA/PVP as a binary dispersant was able to significantly increase the anti-electrolyte property of SiC suspension.

Key words:  polyvinylpyrrolidone; polyepoxysuccinic; SiC suspensions; rheology