Multi-layer ceramic-based composite thermal protection coating as well as preparation method and application thereof

Abstract

The invention provides a multi-layer ceramic-based composite thermal protection coating and a preparation method and an application thereof, and the multi-layer composite thermal protection coating is prepared by a combined process of preparing three layers by a chemical vapor deposition method and preparing two layers by a brushing sintering method, and the coating sequentially comprises a buffer layer, a high-strength self-healing anti-oxidation layer, a middle chemical barrier layer, a ceramic thermal insulation layer and a reinforced isolation layer from inside to outside. The inner buffer layer, the middle chemical barrier layer and the outer reinforced isolation layer are all made of chemical vapor deposition silicon carbide; the strong self-healing anti-oxidation layer of the secondary inner layer is made of silicon powder / zirconium silicide / silicon hexaboride multiphase ceramic; and the material of the ceramic thermal insulation layer on the secondary outer layer is silicon powder / lanthanum hexaboride / mullite / zirconium boride multiphase ceramic. The composite material has excellent thermal protection performance such as oxidation resistance, corrosion resistance and thermal shock resistance, the service life of the material under high-temperature chemical oxidation and corrosion conditions can be remarkably prolonged, and the ceramic-based or carbon-based composite material keeps stable comprehensive performance after being recycled for multiple weeks in the high-temperature environment of 1,500 K or above.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature thermal protective coatings for aerospace, and in particular relates to a multi-layer ceramic-based composite thermal protective coating with long service life, ultra-high temperature resistance, strong self-healing, water oxygen and molten salt corrosion resistance and its Methods of preparation and application. Background technique [0002] Advanced composite materials have been widely promoted and utilized in various fields, especially in the field of aerospace, due to their multifunctionality, maximum economic benefits, structural integrity, and designability. At this stage, my country's aerospace industry has achieved unprecedented development, and the requirements for materials in the aerospace field continue to increase. In order to meet the requirements for material performance in the aerospace field, new and high-performance materials should be developed. Advanced ...

AI Technical Summary

Problems solved by technology

[0003] The high thrust-to-weight ratio of the hot-end composite parts of the aero-engine has a high working temperature, and the internal heat transfer stress of the components is large. In addition, due to the molding characteristics of the prefabricated body and the characteristics of the densification process of the composite material, it is inevitable that some untreated parts will remain inside and on the surface of the matrix. Dense pores, these pores become an important channel for oxidation and corrosion of materials under the coupled environmental conditions of thermal load, water vapor, oxygen and corrosive substances, which makes the surface stability of composite materials deteriorate sharply in the engine working environment, and greatly accelerates the material Deterioration of service performance

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