High-toughness ultrahigh-temperature ceramic-based composite material and preparation method thereof

Abstract

The invention belongs to the technical field of composite material preparation, and particularly relates to a high-strength and high-toughness ultrahigh-temperature ceramic matrix composite material and a preparation method thereof. The preparation method comprises the following steps: alternately depositing two coatings on the surface of the carbon fiber material by adopting a chemical vapor deposition method to obtain the carbon fiber material with the multilayer CVD composite coating, wherein the two coatings are one of a pyrolytic carbon layer or a layered ceramic coating and an ultrahigh-temperature ceramic coating; adopting a phenolic resin/epoxy resin solution and ceramic powder to form ceramic slurry, coating the CVD composite coating carbon fiber material with the ceramic slurry, performing alternately staggered stacking and needling to obtain a stacked fiber felt, and after vacuum drying, performing warm-pressing curing and carbonization treatment, and obtaining a porous prefabricated body; and finally, carrying out densification treatment to obtain the ceramic-based composite material. The material has high strength, high fracture toughness, oxidation resistance, ablation resistance and corrosion resistance, and can be applied to high-temperature and ultrahigh-temperature structural materials, oxidation-resistant and corrosion-resistant materials and aerospace ablation-resistant materials.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a high-strength, tough and ultra-high temperature ceramic matrix composite material and a preparation method thereof. Background technique [0002] Carbon fiber reinforced ceramic matrix composite material is a typical high-tech material. It uses carbon fiber as the reinforcement and ceramic material as the matrix, and has the advantages of both ceramic materials and fiber reinforced composite materials. Carbon fiber reinforced ultra-high temperature ceramic matrix composites combine the characteristics of carbon fiber with low density, high specific modulus, high specific strength, small thermal expansion coefficient and can toughen ceramic materials with the excellent high temperature oxidation resistance and ablation resistance of ultra-high temperature ceramics. The combination of excellent properties and a series of excellent properties suc...

AI Technical Summary

Problems solved by technology

Compared with the traditional CVI and PIP process, this method shortens the preparation time, but the carbon fiber inside the preform has no interface protection, and the reaction infiltration process is easy to cause fiber damage

Chinese patent CN112341228A discloses a preparation method of C / ZrC-SiC ultra-high temperature ceramic matrix composite material. The method utilizes carbon cloth layers and powder layers to be laminated alternately to obtain powdered carbon fiber prefabricated body prefabricated body. Prepare a carbon interface layer on the surface of the preform, and finally use polycarbosilane (PCS) as the precursor solution to prepare the C / ZrC-SiC composite material through multiple PIP processes, but the PIP process is designed for multiple dipping-curing-cracking processes, increasing The dense process is complicated and time-consuming, and the cost is high

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