Thermal properties of CaMgSi2O6 glass–ceramics with Al2O3

The thermal properties of CaMgSi2O6 glass–ceramics with Al2O3 were investigated as a function of Al2O3 content. With increasing of Al2O3 content, the thermal conductivity of the sintered specimen was increased up to 4 vol.% and then decreased, while the coefficient of thermal expansion (CTE) was decreased up to 8 vol.% and then increased. These results could be attributed to the crystallite size and rigidity of glass network, respectively. Typically, the thermal conductivity of 3.07 W/m °C and/or the CTE of 8.76 ppm/ °C (25–600 °C) was obtained for the specimens of CaMgSi2O6 with 4 vol.% and/or 8 vol.% of Al2O3 sintered at 900 °C for 3 h, respectively.