Preparation and properties of highly thermal conductive C/C-SiC

Abstract

A kind of highly thermal conductive silicon carbide matrix composites (c-1000/C-SiC, c-600/C-SiC) reinforced with chopped mesophase pitch-based carbon fibers (c-MPCF) including 1000 W/(m·K) and 600 W/(m·K) were successfully prepared by the phenolic resin precursor impregnation pyrolysis and liquid silicon infiltration (LSI) method. Quasi-isotropic c-MPCF/C-SiC composites demonstrate excellent thermophysical properties, including average flexure strength of 111.5 MPa of c-1000/C-SiC and 123.0 MPa of c-600/C-SiC, average high thermal conductivity of 101.33 W/(m·K) and 93.94 W/(m·K) at room temperature, low coefficient of thermal expansions of 2.942 ppm/K and 3.147 ppm/K at room temperature, which provides a new strategy for preparing isotropic silicon carbide ceramic matrix composites with comprehensive properties and dimensional stability.