Ceramic Properties of Hard Porcelain in Relation to Mineralogical Composition and Microstructure: IV—Thermal-shock Resistance and Thermal Expansion

Thermal-shock resistance of hard porcelain samples are dependent on the concentrations of the crystalline phases (mullite and quartz) and the glassy phase and also on the size of mullite crystals. Internal stresses originating in the samples from the thermal expansion mismatch between the phases also influence the thermal-shock resistance. The thermal expansion of the samples is a function of the asymmetry of size-distribution of mullite crystals.