High-fraction functional gradient aluminum-based silicon carbide composite material and preparation method thereof

Abstract

The invention belongs to the related technical field of composite materials, and discloses a high-fraction functional gradient aluminum-based silicon carbide composite material and a preparation method thereof.The method comprises the steps that S1, a silicon carbide biscuit is printed according to a three-dimensional structure of a gradient porous structure through an additive manufacturing technology; s2, sequentially carrying out low-temperature curing and medium-temperature carbonization treatment on the aluminum-based silicon carbide biscuit to obtain a gradient porous structure silicon carbide preform; s3, the gradient porous structure silicon carbide preform is infiltrated in a polycarbosilane solution, a polydimethylsilane solution or a hetero-element polycarbosilane solution and then subjected to high-temperature curing and cracking in sequence to generate a gradient porous structure silicon carbide ceramic body; s4, carrying out pre-oxidation treatment on the gradient porous structure silicon carbide ceramic body; and S5, filling the silicon carbide ceramic body with the gradient porous structure with liquid aluminum alloy to obtain the high-fraction functional gradient aluminum-based silicon carbide composite material. The preparation method can be used for preparing the high-fraction functional gradient aluminum-based silicon carbide composite material with a high-strength complex structure.

Description

technical field [0001] The invention belongs to the technical field related to composite materials, and more specifically relates to a high-score functionally graded aluminum-based silicon carbide composite material and a preparation method thereof. Background technique [0002] Aluminum-based silicon carbide has excellent properties such as high specific modulus, high specific strength, corrosion resistance, high temperature resistance, and fatigue resistance, and has been widely valued by technicians from all over the world. Among them, silicon carbide, the matrix material in aluminum-based silicon carbide, has the advantages of wide source, low cost, and easy synthesis, and has become one of the important choices to replace traditional materials in composite materials. At present, aluminum-based silicon carbide composite materials have been widely used in the development of key components working under special conditions such as complex loads and environments in military ...

AI Technical Summary

Problems solved by technology

However, the high-ratio aluminum-based silicon carbide gradient composites prepared by these methods have low density and many internal defects, and have disadvantages such as complex process, long cycle, high cost, difficult precise control of gradient components, and difficult precise forming of complex shapes, which greatly limit The development and application of high ratio Al-based SiC gradient composites

[0004] Although additive manufacturing technology can prepare complex parts, the structural strength of functionally graded materials is insufficient and cannot be directly used for load-bearing parts.

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