改性SiC粉悬浮浆料流变特性研究

Research on the Rheological Behavior of Modified SiC Powder Slurry

采用亲水、亲油硅烷偶联剂WD-50、WD-20对SiC微粉进行包覆改性。研究表明,有机包覆改性SiC粉的表面结构中亲水与亲油基团的比例对料浆在低剪切速率下的流变特性有极大影响。改性粉表面全是亲水基团时,料浆触变性大,当固相体积含量由57.4%上升到58.5%时,料浆粘度突然增大1 236.0 mPa.s;随着亲油基团的引入,料浆触变性降低,高固相含量时粘度增大平缓。

The silicon carbide（SiC） fine powders were coated and modified with WD-50 and WD-20. The study showed that the proportions of hydrophile group and lipophile group on the surface of coated SiC powders affect greatly the rheological behavior. The SiC slurry catched high thixotropy when the SiC powders were coated all by hydrophile groups,and the viscosity of the SiC slurry would increase 1 236.0 mPa·s suddenly when its solid loading added from 57.4% to 58.5% ; If the SiC powders were coated by lipophile group, the thixotropy of the SiC slurry would reduce and the enhancive scope of the high solid loading SiC slurry＇ s viscosity would also be weakened.