High-temperature coating comprising nickel-chromium-oxygen active diffusion barrier layer and preparation method

Abstract

The invention relates to a high-temperature coating technology, in particular to a high-temperature coating comprising a nickel-chromium-oxygen active diffusion barrier layer and a preparation method. The high-temperature protection coating comprises a nickel-chromium-oxygen active diffusion barrier inner layer and a high-temperature oxidation protection outer layer. The nickel-chromium-oxygen inner layer can be spontaneously transformed into an alumina / metal / alumina multilayer film structure in a use process, prevent mutual diffusion between the high-temperature oxidation protection outer layer and a metal matrix and has good bonding strength and thermostability, so that effective oxidation resistance components in the high-temperature oxidation protection outer layer are prevented from diffusion to the matrix, the service life of the high-temperature coating is prolonged, and mechanical properties of the matrix are not damaged. The preparation method comprises the steps of preparing the nickel-chromium-oxygen layer on the surface of the matrix by a multi-arc ion plating physical vapor deposition method, and then preparing the high-temperature oxidation protection layer on the active diffusion barrier layer by one or a combination of a vacuum physical vapor deposition method, chemical vapor deposition method, a hot spraying method and the like.

Description

technical field

[0001] The invention relates to high-temperature coating technology, in particular to a high-temperature coating containing a nickel-chromium-oxygen active diffusion barrier layer for high-temperature protection of various metal components and a preparation method thereof. Background technique

[0002] Applying high-temperature protective coatings on the surface of engine blades made of high-temperature alloys, such as: MCrAlY coating (M=Ni, Co), is an effective way to improve the high-temperature corrosion resistance of blades. However, the increase in engine operating temperature significantly intensifies the interdiffusion of alloy components between the blade substrate and the protective coating, specifically as follows: (1) Al and Cr diffuse from the MCrAlY protective coating to the substrate, resulting in the depletion of beneficial components in the coating. Alloy components such as W and Mo diffuse from the substrate to the coating, resulting in a dec...

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