Dependence of thermal properties on crystallization behaviors of (1 − x)MgSiO3–xCaMgSi2O6 glass-ceramics

Effects of crystallization behaviors on thermal properties of (1 − x)MgSiO3–xCaMgSi2O6 (0.36 ≤ x ≤ 0.90) glass-ceramics were investigated. The crystallization behaviors of glasses were confirmed from the activation energy of crystallization (Ea), crystallite size (L) and crystalline phases of clino-enstatite (MgSiO3) and diopside (CaMgSi2O6). The specific heat capacity of the specimens sintered at 800 °C for 5 h was affected by the Ea of glasses. The thermal conductivity and thermal diffusivity of the sintered specimens were dependent on the L of glass-ceramics. The temperature dependence of thermal conductivity was also discussed for the application of lighting-emitting diode (LED) package and substrate materials.