Preparation method of C/C-SiC composite material with high thermal conductivity

Abstract

The invention provides a preparation method of a high-thermal-conductivity C / C-SiC composite material, which comprises the following steps: carbonizing mesophase pitch carbon fibers by using a two-stage carbonization method, weaving the carbonized mesophase pitch carbon fibers into carbon cloth, and puncturing the carbon cloth in the Z direction by using PAN-based carbon fibers by using a fine weaving puncture method to obtain a three-dimensional prefabricated body; and after the three-dimensional prefabricated body is subjected to graphitization treatment, densifying the three-dimensional prefabricated body through a pyrolytic carbon method, then subjecting the three-dimensional prefabricated body to graphitization, and densifying the three-dimensional prefabricated body through a chemical vapor reaction method, so as to obtain the three-dimensional high-thermal-conductivity C / C-SiC composite material.

Description

technical field [0001] The invention belongs to the technical field of structure-function integrated composite materials. In particular, it relates to a preparation method of a C / C-SiC composite material with high thermal conductivity and oxidation resistance. Background technique [0002] High thermal conductivity C / C composites are prepared from mesophase pitch-based carbon fibers as reinforcements. Compared with traditional C / C composites prepared from polyacrylonitrile-based carbon fibers, they have excellent high-temperature mechanical properties, light weight and high strength. In addition, it also has good thermal conductivity and is a new type of composite material with integrated structure and function, which can be widely used in aerospace, nuclear energy industry and some civil industries. At present, the application environment of high thermal conductivity C / C composite materials is mostly high temperature environment and aerobic environment. Due to the limitati...

AI Technical Summary

Problems solved by technology

Utilizing SiC to modify C / C composites is one of the main thermal protection means of traditional polyacrylonitrile-based C / C-SiC composites; in contrast, the preparation of high thermal conductivity C / C-SiC composites requires a special structure During the design and preparation process, the main surface is in the following aspects: First, the modulus of the high thermal conductivity mesophase pitch-based carbon fiber is much higher than that of the PAN-based carbon fiber, usually above 800GPa, the performance of the weaving process is poor, and fiber damage is very easy to occur when the preform is formed As a result, the mechanical properties and thermal conductivity of the final composite material are significantly reduced.

At the same time, due to the different structure of pyrolytic carbon in high thermal conductivity C / C-SiC composites and traditional C / C-SiC composites, the interface of pyrolytic carbon / SiC ceramic phase appears later thermal mismatch phenomenon