Preparation method of high-temperature oxidation resistant coating for surface of turbine blade of aero-engine

By depositing an oxygen-doped coating on the surface of N5 alloy, the problems of thermal expansion coefficient difference and element mutual diffusion between the high-temperature protective coating and the substrate are solved, and the oxidation resistance and long-term stability of the coating are improved, making it suitable for high-temperature components such as aircraft engine turbine blades.

CN120591734APending Publication Date: 2025-09-05NORTHEASTERN UNIV CHINA
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Patent Information

Application Number
CN202510714114.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

There is a significant difference in thermal expansion coefficient between the existing high-temperature protective coating and the substrate, which leads to stress accumulation in the oxide film and causes spalling failure. At the same time, the difference in composition between the coating and the substrate causes element interdiffusion, destroying the alloy's γ/γ' dual-phase structure and reducing the mechanical properties.

Method used

Multi-arc ion plating technology is used to deposit an oxygen-doped coating on the surface of N5 alloy. The coating composition is regulated by oxygen doping, which reduces the difference in thermal expansion coefficient between the coating and the oxide film. Combined with the homogeneous design of the target material and the substrate, the mutual diffusion of elements is avoided, thereby improving the oxidation resistance and long-term stability of the coating.

Benefits of technology

It significantly reduces the difference in thermal expansion coefficient between the coating and the oxide film, reduces stress accumulation in the oxide film, maintains the stability of the γ/γ' dual-phase structure, improves the oxidation resistance and long-term stability of the coating, and is suitable for large-scale industrial applications.

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Abstract

The invention relates to the technical field of high-temperature protective coatings, in particular to a preparation method of a high-temperature oxidation resistant coating for the surface of a turbine blade of an aero-engine, which is realized by cleaning an N5 alloy blade, depositing an oxygen-doped coating by multi-arc ion plating and performing vacuum annealing treatment. The thermal expansion coefficient difference between the coating and an oxidation film is reduced through oxygen doping, stress accumulation is reduced, meanwhile, an N5 alloy target homogenized with a matrix is adopted, element mutual diffusion is avoided, and the stability of a gamma / gamma'double-phase structure is maintained. The preferred process parameters comprise the flow ratio of Ar to O2, the deposition temperature and the annealing condition. The prepared coating is excellent in oxidation resistance at the temperature of 1000 DEG C, the weight increment is only 0.5 mg / cm, the peeling and cracking phenomena do not exist in circulating oxidation, the problem that a traditional coating is prone to failure is solved, and the method is suitable for large-scale industrial application.
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