Glass-ceramic composite material

Abstract

The present invention is directed to stably achieve a good thermal conductivity in a glass-ceramic composite material in which aluminum nitride particles are used as filler particles. The glass-ceramic composite material according to the present invention includes a glass matrix and filler particles, each of which is formed by an aluminum nitride particle having a surface layer on which an oxide film is formed, and arranged in the glass matrix. The present invention has characteristic features that the filler particle has a cornerless smooth surface, and that a percentage of the number of filler particles having a sphericity of 0.8 or greater, which is a value of a minor diameter divided by a major diameter, is higher than or equal to 70% on the condition where any fine particle of which particle diameter is smaller than 0.5 μm is excluded from the number of the filler particles.

Dependencies are inferred from the claim text.