OBTAINING AND THERMOPHYSICAL PROPERTIES OF THERMAL LINERS BASED ON SILICONE ELASTOMER FILLED WITH HEXAGONAL BORON NITRIDE

Basic thermophysical and electric-insulation properties of composite fi lm materials based on silicone and hexagonal boron nitride with a content of the heat-conductive fi ller as high as 46 vol.% have been described. The maximum thermal conductivity was 6 W/(m·K) at a thermal-conductivity anisotropy of about 2.0. The obtained materials possessed a high bulk electrical resistance at a constant current of >10⁹ Ω·cm. It has been shown that in the target interval of operating conditions, the thermal diff usivity of a material at diff erent contents of the fi ller depends weakly on temperature, and the thermal decomposition of the binder begins at a temperature no lower than 400^o C. It has been established that the cross-linking of silicone under pressure may noticeably (up to 20%) increase the composite′s thermal conductivity and its anisotropy.
Basic thermophysical and electric-insulation properties of composite fi lm materials based on silicone and hexagonal boron nitride with a content of the heat-conductive fi ller as high as 46 vol.% have been described. The maximum thermal conductivity was 6 W/(m·K) at a thermal-conductivity anisotropy of about 2.0. The obtained materials possessed a high bulk electrical resistance at a constant current of >10⁹ Ω·cm. It has been shown that in the target interval of operating conditions, the thermal diff usivity of a material at diff erent contents of the fi ller depends weakly on temperature, and the thermal decomposition of the binder begins at a temperature no lower than 400^o C. It has been established that the cross-linking of silicone under pressure may noticeably (up to 20%) increase the composite′s thermal conductivity and its anisotropy.
Author:  N. S. Romanov, E. A. Danilov, E. M. Gurova, E. A. Grishukhina
Keywords:  thermal interface, thermal conductivity, thermal liner, silicone, hexagonal boron nitride, dielectric properties, thermal diff usivity
Page:  1605