Carbon/carbon composite material as well as preparation method and application thereof

Abstract

The invention relates to a carbon / carbon composite material as well as a preparation method and application thereof. The preparation method of the carbon / carbon composite material comprises the following steps: sequentially carrying out carbon deposition and silicon carbide deposition on a carbon fiber preform by adopting a chemical vapor deposition method to obtain a silicon carbide-containing carbon / carbon composite rough blank, dipping the carbon / carbon composite rough blank in a molybdenum source solution, baking the carbon / carbon composite rough blank, carrying out reduction reaction in areducing atmosphere to obtain a carbon / carbon composite precursor containing elemental molybdenum, and finally, carrying out melt siliconizing treatment on the carbon / carbon composite precursor to obtain the carbon / carbon composite material containing silicon carbide and molybdenum silicide. The internal components of the carbon / carbon composite material prepared by the preparation method are uniform and stable, the difference between the internal and external layer components is small, the difference between the internal thermal expansion coefficients of the material is small, and the carbon / carbon composite material has excellent high-temperature oxidation resistance and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a carbon / carbon composite material and its preparation method and application. Background technique [0002] In recent years, carbon / carbon composites (C / C) have gradually become a research hotspot. Carbon / carbon composite materials have the advantages of low thermal expansion coefficient, low density, ablation resistance, corrosion resistance, good friction, good thermal and electrical conductivity, high strength and high modulus, and are widely used in aviation, aerospace and civil industries. However, carbon / carbon composites will suffer oxidation weight loss under aerobic conditions higher than 370 °C, resulting in a significant decline in the mechanical properties of the material, which seriously restricts the application of carbon / carbon composites. [0003] Molybdenum disilicide has the advantages of high melting point, low density, good thermal con...

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Problems solved by technology

Based on this, technicians try to overcome the defects of poor high temperature oxidation resistance in carbon / carbon composite materials by preparing ternary composite materials of silicon carbide, molybdenum silicide and carbon / carbon materials

[0004] In the current technology, carbon, silicon carbide and molybdenum silicide are usually combined by hot pressing process, or directly use physical infiltration method to infiltrate molybdenum silicide powder or molybdenum silicide slurry into carbon / carbon body to prepare silicon carbide, molybdenum silicide and carbon / carbon However, the composition of the inner and outer layers of the ternary composite materials prepared by these preparation methods is quite different, and the thermal expansion coefficient difference between C / C and molybdenum silicide is large, which makes it difficult for the two to achieve thermal matching, resulting in a large difference in the thermal expansion coefficient inside the ternary composite material, and it is easy to generate stress when heated, which leads to a decrease in its high temperature resistance and mechanical properties, and this method cannot prepare materials with large thickness

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