鱗片状窒化ホウ素の配向が静電吸着法で作製したポリメタクリル酸メチル/窒化ホウ素コンポジット電気絶縁材料の電気特性および熱的特性に与える影響

摘要

The thermal conductive plate in a device like power module for an automobile requires materials with higher thermal conductivity and acceptable electric breakdown strength. To develop a composite material with both a higher thermal conductivity and acceptable breakdown strength, polymethylmethacrylate (PMMA) / hexagonal boron nitride (h-BN) composite materials in which the flaky surface of h-BN oriented parallel to the electric field and the thermal conductivity measurement (= the sample thickness) direction were produced by an electrostatic adsorption method. The breakdown strength of the PMMA/h-BN composite material showed the increasing trend with the increase of the PMMA particle size. On the other hand, the thermal conductivity of the PMMA/h-BN composite material also showed the decreasing trend with the increase of the PMMA particle size. The h-BN content and/or the orientation rate of the flaky surface of h-BN to the electric field (= the thermal conductivity measurement) direction determine these properties.