Effect of Phase Distribution on Thermal Conductivity of A1N/glass Composites

AIN/borosilicate glass composites were prepared by hot-press sintering at low temperatures between 850℃ and 1000℃. The microstructures of the composites were observed by SEM and TEM, and phases analyzed by XRD. The influences of glass content and phase distribution in the composites on their thermal conductivities were investigated. The results show that the decrease in glass phase content will lead to the increase of thermal conductivities. When the glass content is 50wt%, the thermal conductivity (A) of the composite will increase with the increase of temperature. With 30wt% glass, A decreasing with the increase of temperature, the composite displays crystal characters.