Effect of crystallization on thermal conductivity of diopside

Abstract

Dependence of thermal conductivity on the crystallization behavior of CaMgSi2O6 glass-ceramics was investigated as a function of TiO2, V2O5 and MoO3 content. With the co-addition of TiO2, V2O5 and MoO3, the glass transition temperature (Tg) was decreased, while the peak temperature of crystallization (Tp) was increased. The onset temperature of crystallization (Tc) was dependent on the types and amount of additives. Due to the differences of Tc with additives, the crystallization behaviors such as the degree of crystallization and crystallite size of the specimens were changed. The thermal diffusivity of the specimens sintered at 900°C for 1 h was increased with the crystallite size. With increasing of the degree of crystallization, the thermal conductivity of the specimens was increased, while the temperature coefficient of thermal conductivity was decreased. © 2010 The Ceramic Society of Japan. All rights reserved.