Effect of Carbon Fiber Coating on Thermal Conductivity of Carbon Fiber Reinforced Lithium Alumina Silicate Glass-ceramics Composites

Abstract

The carbon fibers with two and four order graphite intercalation were fabricated by high temperature heat treatment of carbon fibers coated by lithium-silicate sol using sol impregnation method. After that, the as-prepared carbon fibers were applied to synthesize carbon fiber reinforced lithium alumina silicate (Cf/LAS) glass-ceramic composites. The results indicate that the increase of sintering temperature and the formation of graphite intercalated compounds on the surface of carbon fibers can significantly improve the thermal conductivity of Cf/LAS composites. Compared to the Cf/LAS composites without coatings 1.1-1.3W/(m·K), the thermal conductivity of Cf/LAS composites with coating treatment increases from 1.3W/(m·K) to 2.2W/(m·K), with the increase of 70%.

Keywords

• carbon fiber
• LAS
• glass-ceramics composites
• thermal conductivity