A method for preparing carbon-modified aluminum alloy composite material by vacuum pressure infiltration method

Abstract

The invention relates to the technical field of aluminum alloy preparation, and discloses a method for preparing a carbon-modified aluminum alloy composite material by a vacuum pressure infiltration method, which comprises the following steps: fully mixing ceramic particles with an aqueous solution of a cationic surfactant, drying, and obtaining a coated Ceramic particles coated with cationic surfactants; adding carbon materials and ceramic particles coated with cationic surfactants into water, performing electrostatic self-assembly under stirring, and drying to obtain composite particles; mixing composite particles with foaming agent After uniformity, hot-press sintering is carried out to obtain a porous preform; in the vacuum pressure infiltration equipment, the aluminum alloy ingot is melted and impregnated into the porous preform, and the carbon-modified aluminum alloy composite material is obtained after cooling. The method of the invention can effectively improve the compatibility between the aluminum alloy and the carbon material, the prefabricated body in the preparation process is not easy to crack, and the aluminum alloy can be fully filled in the pores of the prefabricated body, thus the tensile strength and thermal conductivity can be obtained Better composites.

Description

Technical field [0001] The present invention relates to the preparation of aluminum technical field, particularly to a vacuum pressure impregnation Preparation of modified aluminum alloys carbon composite method. Background technique [0002] Aluminum matrix material composite material (aluminum and aluminum alloys), reinforcing materials (fibers, whiskers and particulates) consisting of two parts, since the quality of light, belongs to a lightweight metal matrix composite; it not only has an aluminum matrix low density, good thermal conductivity, corrosion resistance, etc., but also to maintain the overall performance of a number of metal matrix composite material, such as better dimensional stability than stiffness, etc., have become the focus of research of new materials. Carbon modified aluminum alloy composite material is carbon fibers, carbon nanotubes, graphene, carbon material such as reinforcement, a composite material collectively referred to as a matrix of the aluminum...

AI Technical Summary

Problems solved by technology

But at the same time, this method also has the following problems: (1) The strength of the composite ingot formed by hot pressing and sintering of aluminum and carbon nanotubes is relatively small, and problems such as cracking will occur during the stirring and casting process, which will affect the final product. The strength of the composite material; (2) The foaming agent will play a role after adding the aluminum liquid, which will generate a large number of bubbles in the aluminum liquid, and the aluminum liquid will be filled into the composite ingot by the method of stirring casting, and the aluminum liquid will penetrate into the composite billet The speed of the ingot is slow, which may cause pores not filled with molten aluminum in the final composite material, which affects the strength and thermal conductivity of the composite material; and the carbon material will react with the molten aluminum for a long time, and the generated Al 4 C 3 The thermal conductivity is small (140W / m K), resulting in a large interface thermal resistance between the carbon material and the aluminum matrix, which affects the thermal conductivity of the composite material

Images