Preparation of C / C-SiC composite material and method by low-temperature reactive infiltration of silicon-nickel alloy

The SiC phase and alloy phase are formed in the C/C composite material by the low-temperature reactive infiltration method of silicon-nickel alloy, which solves the problems of low strength and high-temperature fiber damage in the traditional pure silicon reactive infiltration process, realizes the preparation of high-strength and high-toughness C/C-SiC composite materials, and reduces energy consumption and costs.

CN116970880BActive Publication Date: 2025-09-19XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202310965914.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-02
Publication Date
2025-09-19
Estimated Expiration
2043-08-02

AI Technical Summary

Technical Problem

The C/C-SiC composite materials prepared by the traditional pure silicon reactive infiltration process have low strength. The high temperature of the traditional process leads to high energy consumption and high cost, and high temperature damages the fiber strength. The existing improvement methods have the problems of complicated process, high cost and limited performance improvement.

Method used

The low-temperature reactive infiltration method of silicon-nickel alloy is adopted. By using a specific proportion of silicon-nickel alloy to react with porous C/C composite materials under low temperature conditions (<1414 ℃), SiC phase and alloy phase (NiSi2 and NiSi) are formed to improve the mechanical properties of the composite material.

Benefits of technology

It significantly improves the flexural strength and fracture toughness of C/C-SiC composite materials, reduces process temperature requirements, shortens production cycles, improves industrial production efficiency, and maintains the fiber's reinforcing properties.

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Abstract

The present invention discloses a method for preparing a C / C-SiC composite material by low-temperature reactive infiltration of a silicon-nickel alloy. The method comprises the following steps: uniformly pressing silicon powder and nickel powder into a mold by mechanical stirring and grinding; heating the pressed block to form a silicon-nickel alloy, and crushing the alloy block into alloy particles; laying a porous C / C composite material on top of the silicon-nickel alloy particles, and reactive infiltration in a vacuum furnace in a vacuum atmosphere or an Ar or N2 inert atmosphere to obtain a C / C-SiC composite material. The silicon-nickel alloy is used to address the limitations of the C / C-SiC composite material prepared by the pure silicon reactive infiltration process, such as low strength, high reactive infiltration temperature, and damage to fiber strength. The present invention has the advantages of significantly reducing the reactive infiltration process temperature, improving the uniformity of SiC phase distribution in the matrix, and improving the mechanical properties of the composite material, such as flexural strength and fracture toughness.
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