Thermally conductive material and method for producing same

Abstract

A thermally conductive material obtained by dispersing a filler in a matrix composed of a resin. The filler includes spherical particles composed of aluminum nitride and plate-like particles composed of boron nitride. The volume ratio of plate-like to spherical particles is, for example, 0.4 to 1.5. The particle diameter ratio of the plate-like to the spherical particles is, for example, 0.05 to 0.5. The volume percent of the filler to the thermally conductive material as a whole is, for example, 73 to 93 vol %. The thermally conductive material that satisfies such conditions can develop remarkably high thermal conductivity. The thermally conductive material can be produced through a preparation step of obtaining a mixture in which spherical particles, plate-like particles, and a resin are present in a mixed manner, and a molding step of forming the mixture into a molded body. The preparation step may be performed in multiple stages.

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