Characterization of surface conditions of non oxide ceramic powders by heat of immersion in water

Abstract

The surface characteristics of non oxide ceramics were investigated through the heat of immersion in water by means of Calvet type calorimeter. Following materials were examined in this study: uncovered silicon nitride and silicon carbide powders(rinsed with hydrogen fluoride), surface oxidized silicon nitride and silicon carbide powders(treated in a heated oxygen atmosphere), amorphous silica and quartz silica powders. The value of the heat of immersion of silicon nitride had approached to that of amorphous silica by surface oxidation.