The Effect of Phenol Resin Types and Mixing Ratios on the Synthesis of High-purity β-SiC Powder by the Sol-Gel Method

摘要

In this study, we carried out a sol-gel processing to synthesize two types of phenol resin and TEOS sol with fluoric acid as the catalysts, and fabricated the P-SiC powder by carbothermal reduction of the obtained precursor gels. The gels were observed to be cross linked between TEOS and phenol resins by FT-IR and TG-DTA. After pyrolyzed at 1000°C in Ar to obtain the precursor, to confirm the phase transition and morphologies by XRD, and SEM were measured. Finally, the light green colored SiC powder was obtained after carbothermal reduction process up to 1800°C. The residual condensed SiO_((v)) phase and free carbons as a role of impurities for final products using the solid type phenol resin was observed in the surface of powder by BSE.