Carbon-carbon/aluminium composite material preparation method

Abstract

A high thermal conductivity, low expansion carbon-carbon / aluminum composite material. Used in the field of electronic devices. The present invention is composed of carbon fiber, pyrolytic carbon, and aluminum matrix, wherein the carbon fiber is completely wrapped in the pyrolytic carbon layer, and the aluminum matrix is ​​on the outside of the pyrolytic carbon layer, wrapping the pyrolytic carbon layer and carbon fiber, and the thickness of the pyrolytic carbon layer is Between 1 and 4 μm. In the present invention, since the pyrolytic carbon and the aluminum matrix hardly have an interface reaction, the interface is very clean, and it is difficult to find the interface product Al 4 C 3 , the excellent chemical compatibility between pyrolytic carbon and aluminum matrix reduces the interfacial thermal resistance. By controlling the form of pyrolytic carbon, the pyrolytic carbon has extremely high thermal conductivity, so that the thermal conductivity of the material is effectively improved without using high thermal conductivity fibers, and a relatively low-cost thermal conductivity material is obtained. The rate exceeds 150W / mK, and the thermal expansion coefficient is 4~8×10 -6 The carbon-carbon / aluminum composite material can fully meet the demand for this material in chip thermal control and other related fields.

Description

Technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a carbon-carbon / aluminum composite material. Used in the preparation of high-performance materials. Background technique [0002] Generally, the preparation process of carbon / aluminum composite materials includes two steps: 1. Preparation of carbon fiber preforms; 2. Compounding with aluminum to form materials. At present, there are many methods for preparing carbon fiber preforms, but using a frame or mold to manually arrange fibers is still the main method for making carbon fiber preforms. Because carbon fiber itself is relatively soft, carbon fiber preforms made using current technology mainly rely on external means such as frames and molds to maintain the structure and porosity of the preforms, and therefore cannot be mechanically processed to change the shape of the preforms. In the subsequent process, the molten aluminum is hydraulically injec...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the two key problems of difficulty in preparing carbon / aluminum composite material prefabricated parts and difficult control of interface reaction, based on the existing carbon-carbon composite material preparation method and carbon / aluminum composite material preparation method, a carbon-aluminum composite material preparation method is proposed. The preparation method of carbon / aluminum composite materials enables it to effectively solve the two problems of prefabricated part preparation and interface reaction control in the preparation process of carbon / aluminum composite materials, which helps to simplify the process and reduce costs, thus providing carbon / aluminum composite materials Lay the foundation for a wide range of applications