Abstract： SiC powders were modified by surface coating with different kinds of silane coupling agents in ethanolic suspensions by ball milling. The results show that the composition and structure of silane coupling agents can markedly affect the property of modified SiC slurry. Solid content and rheological property of the slurry obviously increase when the silane coupling agent KH-560 with mass fraction of 0.10% is added. The organic residues in the upper liquid of washing slurry detected by total organic carbon (TOC) indicate that SiC slurry exhibits better cladding layer and the stability of SiC slurry improves greatly.

Keywords: SiC powder; silane coupling agent; surface modification; rheological property