Study on the Rheology of Acetic Acid Modified SiC Powder and Pastes Reinforced by Solvothermal Method

This paper investigates a straightforward method of powder surface modification to increase the efficiency of acetic acid small molecules adhering to the surface of SiC powder. This method involves pretreating the SiC powder with diluted sulfur-containing solutions and enhancing the reaction between acetic acid and silica hydroxyl groups on the surface of SiC powder in a closed solvothermal environment. X-ray photoelectron spectroscopy analysis showed that acetic acid formed chemical bond with SiC surface silicon hydroxyl groups under the action of sulfur-containing catalyst and solvothermal method; thermogravimetric analysis results showed that acetic acid formed stable adsorption on the SiC powder surface. The modified powder's zeta potential value reached 60.8 mV at pH=10.8, and the dispersion stability was significantly improved. Compared with the original powder, the viscosity of the slurry formulated with the modified powder was less than 60 mPa.s at 47 vol% solid content, and the rheological properties of the slurry were improved.