Preparation method and application of carbon fiber/silicon carbide particle co-toughened aluminum-based composite

Abstract

The invention provides a preparation method and application of a carbon fiber / silicon carbide particle co-toughened aluminum-based composite, and belongs to the technical field of composite preparation. According to the preparation method, colloid formed in the manner that hydroxyethyl cellulose is dissolved in water is used as dispersion liquid, surface modified carbon fibers and silicon carbideparticles are evenly dispersed into aluminum powder, a colloid solution is fast filtered to obtain powder with the surface modified carbon fibers, the silicon carbide particles and the aluminum powdermixed evenly, and then the powder is subjected to hot pressing to form the composite through a powder metallurgy method. The method is simple in preparation process, and the prepared composite is light in mass, large in tensile strength and bending strength and high in hardness and can be applied to automobile engine pistons and connecting rods well.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a method for preparing a carbon fiber / silicon carbide particle co-increased aluminum-based composite material. Background technique [0002] Carbon fiber has the characteristics of low density, high strength, and high modulus. As a commonly used metal, aluminum has the characteristics of low density, good electrical and thermal conductivity, high fracture toughness, and good corrosion resistance. The composite material prepared by applying carbon fiber to strengthen the aluminum matrix has the characteristics of light weight, high specific strength, specific modulus, and corrosion resistance. Silicon carbide has the advantages of high hardness, high modulus, and low thermal expansion. Adding a certain amount of silicon carbide particles to carbon fiber reinforced aluminum matrix composites can further improve its performance and open up the appl...

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Problems solved by technology

[0003] There are some key problems in the preparation process of carbon fiber / silicon carbide particle co-increased aluminum matrix composites. The first is the dispersion of carbon fiber and silicon carbide particles in the aluminum matrix. Due to the large specific surface area and high major diameter of carbon fiber Ratio, resulting in strong van der Waals force between the fibers, making carbon fibers easy to agglomerate and difficult to disperse. Silicon carbide particles are generally micron or nanometer in size, have high surface energy, and are difficult to disperse in the aluminum matrix. Secondly, there is a serious interface reaction problem between carbon fiber and aluminum matrix.

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