SiC-Cu complex phase sweating cooling material used for thermal protection, and preparation method thereof

Abstract

The invention discloses a SiC-Cu complex phase sweating cooling material used for thermal protection, and a preparation method thereof. The complex material comprises, by volume, 50-75% of a SiC ceramic phase and 25-50% of Cu metal phase, wherein the SiC ceramic phase is in a porous structure; the pores are communicated in three-dimensional space; and the Cu metal phase adheres on the surface of the pores. The preparation method comprises three key processing steps of preparing recrystallized SiC ceramic; coating tungsten carbide on the inner surface of the porous SiC ceramic and infiltrating Cu into the porous SiC ceramic coated by the tungsten carbide spontaneously. A uniform and continuous tungsten carbide layer coats the inner surface of the crecrystallized porous SiC ceramic by adopting a vacuum sol-gel impregnation technology in combination of a carbonization method; and then the SiC-Cu complex phase sweating cooling material is prepared by a spontaneously infiltration process. The method is simple in process and low in cost, can prepare various components with complex shapes, obviously increase high-temperature ablative resistant property of the SiC-Cu complex phase sweating cooling material.

Description

technical field [0001] The invention relates to a self-sweating cooling material for aerospace thermal protection and a preparation method thereof, in particular to a ceramic-based composite material with copper as a sweating agent and carbide ceramics as a matrix and a preparation method thereof. Background technique [0002] When the solid rocket motor is working, the injector panel, the inner wall of the combustion thrust chamber, the throat liner, the nozzle and other parts are subjected to the action of high-temperature gas flow of up to 3000K. Therefore, the key parts of the rocket motor must be well cooled to avoid Ablation damage occurs to ensure the normal operation of the engine and realize the reusability of the engine. [0003] Spontaneous sweating cooling technology is a bionic technology, which uses the principle that organisms adjust their own environment (temperature) in order to survive, which is similar to the sweating and heat dissipation of the human body...

AI Technical Summary

Problems solved by technology

However, the advantages of pure copper as a sweating agent cannot be fully utilized after Cu matrix alloying, thereby reducing the high temperature ablation resistance of SiC / Cu multiphase sweating cooling materials

In addition, SiC and Cu are prone to react to form graphite at high temperature, which will deteriorate the high-temperature performance of SiC matrix materials. Therefore, how to effectively solve the wettability and reactivity between SiC and Cu has become an important issue in the preparation of SiC / Cu composite phases. Key Issues with Sweating Cooling Materials

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