Abstract
The effects of the addition of water glass on specific surface areas and on the catalytic performance of self-cleaning porcelain enamel containing MnO2 were investigated by means of TG-DTA, adsorption isotherms and determination of weight loss of lard. The specific surface areas and catalytic performance of heat-treated MnO2 were markedly decreased by the decomposition of MnO2 to Mn2O3 at 550deg C. Addition of water-glass to glass frit lowered the glass transition temperature, prevented the decomposition of MnO2 to Mn2O3, raised the surface hardness of the enamel and lowered the firing temperature of the enamel by more than 100deg C compared to enamel without water glass.
