Influence of β-Sialon/Ti(C, N) Powders on the Corrosion and Oxidation Resistance of Zero-Cement Al₂O₃-SiC-C Refractory Castables

Abstract

Al₂O₃-SiC-C refractory castables added with β-sialon/Ti(C, N) powders were prepared with silica sol and phenolic resin as binding agents at room temperature. The effects of β-sialon/Ti(C, N) powders, silica sol and phenolic resin on slag penetration and corrosion resistance as well as oxidation resistance of the refractory castables were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscope. Corrosion resistance and oxidation resistance mechanisms of the Al₂O₃-SiC-C refractory castables were also discussed. The results showed that the castables obtained with silica sol as the binding agent at a temperature of 1450^oC presented better oxidation resistance. The oxidation resistance and slag erosion resistance of the refractory castables could be improved by adding Ti(C, N)/β-sialon powders. Static crucible method and fractal dimension calculation result showed that the prepared castables possessed excellent slag erosion resistance.

Keywords:

• β-sialon/Ti(C, N) powders
• Zero-cement
• Castables
• Phenolic resin
• Silica sol