Self-reinforced multi-mode nano-structured thermal barrier coating with stable phase and preparation method thereof

A nanostructure and thermal barrier coating technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of coating failure, cracks in the coating, etc., and achieve good repeatability, process stability, Realize the effect of simple and efficient process
CN109852918AActive Publication Date: 2019-06-07XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2019-06-07

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Abstract

The invention discloses a self-reinforced multi-mode nano-structured thermal barrier coating with a stable phase and a preparation method thereof. By adopting a supersonic plasma spraying method, alloy powder is sprayed on a substrate to form a bonding layer, and then nano-structured yttria-stabilized zirconia spherical particle aggregates are sprayed on the bonding layer to form the coating. Theprocess parameters of the supersonic plasma spraying method are that arc current is 300-550 A, arc voltage is 110-150 V, main air flow is 120-155 slpm, secondary air flow is 10-40 slpm, the spraying distance is 90-110 millimeters, and the powder feeding amount is 30-50 g / min. A nanocrystalline region (30-90 nanometers), a submicron crystalline region (110-900 nanometers), an unfused nano-region (20-60 nanometers), and a multi-mode nano-structured thermal barrier coating body composed of a semi-melted region and an amorphous region are present inside the coating. The coating has high phase stability and a self-reinforced property.
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Description

technical field

[0001] The invention relates to the field of turbine blades of aero-engines and heavy-duty gas turbines, in particular to a phase-stabilized self-reinforcing multi-mode nanostructure thermal barrier coating and a preparation method thereof. Background technique

[0002] In recent years, nanotechnology has significantly improved the physical and mechanical properties of materials due to grain size effects. Turbine blades are the core components of aero-engines with the highest temperature and the most demanding service conditions. But even for single crystal blade materials, the load-bearing temperature limit is only about 1150°C. Thermal barrier coating is currently recognized internationally as the most practical method that can greatly increase the service temperature of engine blades. All aviation powers have listed thermal barrier coating as a key science and technology. Plasma spraying is currently a common method for preparing thermal barrier coatings...

Claims

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