Comparative Study on the Ablation Resistance and Mechanical Properties of C/C Composites Reinforced with Cfmp/C Composites and Cfpan/C Composites

Abstract

C/C composites will inevitably undergo oxidative damage under some extreme environments, which will lead to the consumption of the matrix. Although various post-treatment techniques have been proposed to enhanced the thermomechanical properties of C/C composites, the ablative resistance and mechanical properties of C/C composites themselves have still not been systematically investigated. In this study, 2.5D CFPAN/C composites and 2.5D CFMP/C composites are obtained from mesophase pitch-based carbon fiber (CFMP) and polyacrylonitrile-based carbon fiber (CFPAN) as the reinforcing carbon fibers by CVI and heat treatment process. and their ablation properties and mechanical behaviors are systematically investigated. The results show that the surface temperature of 2.5D CFMP/C composites is 100°C lower than that of 2.5D CFPAN/C composites, and the mass ablation rate and line ablation rate of 2.5D CFMP/C composite decreased from 3.307 mg/s to 1.412 mg/s and from 3.067 µm/s to 0.501 µm/s, respectively. In addition, the mechanical properties of the two C/C composites are outstanding, which will lay the foundation for their stability in ablative environments.

Keywords: C/C composites, Mesophase-pitch-based carbon fiber, Ablation properties, Mechanical properties, High thermal conductivity