Preparation method of graphene/silicon carbide/aluminum composite material

Abstract

The invention relates to a preparation method of a graphene / silicon carbide / aluminum composite material. The preparation method includes the following preparation steps that after silicon carbide fiber / graphene oxide mixed dispersion liquid of a certain concentration is prepared according to the proportion, the mixed dispersion liquid is transferred into a PTPE mold, the mold is placed on the surface of liquid nitrogen for fast freezing, then freezing and drying are performed, pre-sintering is performed, and an oriented and orderly arranged silicon carbide fiber / three-dimensional graphene framework is obtained; and enough aluminum blocks are vertically placed on the surface of the silicon carbide fiber / three-dimensional graphene framework, pressure infiltration is performed in a vacuum pressure infiltration furnace, and the compact graphene / silicon carbide / aluminum composite material is obtained. Graphene and silicon carbide fibers in the composite material prepared through the preparation method are of a three-dimensional network crossed structure, more heat conduction channels are provided, three-dimensional network crossing of the silicon carbide fibers provides the high-strength framework, and the high temperature stability of the material is improved. The composite material prepared through the preparation method is uniform in component, low in heat expansion coefficient and high in heat conduction rate.

Description

Technical field: [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a method for preparing a high thermal conductivity and low expansion graphene / silicon carbide / aluminum composite material. Background technique: [0002] Aluminum matrix composites have become the most widely used metal matrix composites due to their low density, good heat treatability, and flexible preparation process. Among them, silicon carbide reinforced aluminum matrix composites have become a research hotspot of aluminum matrix composites due to their excellent thermal conductivity, low expansion coefficient, high specific strength and specific stiffness, and wear resistance. Currently commonly used reinforcements include silicon carbide particles and silicon carbide fibers. Silicon carbide fiber has high specific strength, specific modulus and excellent high temperature performance. The thermal expansion coefficient of silicon carbide fiber is sm...

AI Technical Summary

Problems solved by technology

[0004] The current research mainly focuses on the reinforcement effect of silicon carbide fiber or three-dimensional graphene alone. There are few reports on the synergistic reinforcement effect of the two, and there are even fewer studies on the thermal conductivity of composite materials.