Environmental barrier coating used for poly-carbon and ceramic base compound material and preparation method thereof

Abstract

The invention relates to an environmental barrier coating used for a poly-carbon and ceramic base compound material and a preparation method thereof. The environmental barrier coating includes, successively from a substrate material to exterior, a silicon adhesion layer being 60-70 [mu]m in thickness, a mullite layer being 60-80 [mu]m in thickness, a rare earth silicate layer being 100-120 [mu]m in thickness, and a rare earth zirconate layer being 100-150 [mu]m in thickness. In the environmental barrier coating, the rare earth silicate layer can effectively inhibit an element diffusion reaction between the mullite layer and the rare earth zirconate layer, and the rare earth zirconate layer can significantly reduce volatilization of SiO2, so that a defect of poor high-temperature stability of the rare earth silicate layer is solved. During use, the components of the whole coating is not liable to change, so that service life of the coating under environment of an aero-engine can be greatly prolonged, and protective effect is improved.

Description

technical field [0001] The invention relates to the field of functional coating materials, in particular to an environmental barrier coating for multi-component carbon and ceramic matrix composite materials and a preparation method thereof. Background technique [0002] Compared with superalloys, multi-component carbon and ceramic matrix composites have higher high-temperature stability, can withstand higher turbine inlet temperatures, reduce structural weight, and have broad application prospects in high thrust-to-weight ratio aeroengines. Such as silicon carbide ceramic matrix composites (SiC f / SiC,C f / SiC) has excellent oxidation resistance in a high-temperature dry environment, and a dense oxide protective film can be formed on the surface, which can avoid further erosion of the interior of the material by the oxidative environment, and effectively protect the matrix of multi-element carbon and ceramic matrix composite materials. . However, in the working environmen...

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Problems solved by technology

However, even for the surface layer system of rare earth silicate, in the environment of aero-engine, the SiO 2 There is still a large possibility of volatilization, which will lead to changes in the composition of the coating, which will directly lead to holes and cracks in the coating process, which will seriously affect the service life and protective effect of the environmental barrier coating.

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