Method for preparing whisker toughened composite coating by liquid-phase method spraying process

Abstract

The invention discloses a method for preparing a whisker toughened composite coating through a liquid-phase method spraying process, and belongs to the field of nano thermal protection coating preparation. Whiskers and ceramic-based nano powder are mixed and then added into a solvent, then a dispersing agent and a softening agent are added to obtain a suspension, the suspension is sprayed out through a centrifugal atomizer after being subjected to ball milling, the atomized suspension is melted under the action of a plasma heat source of plasma spraying and impacts the surface of a base body, and the whisker toughened composite ceramic coating is obtained. The method is short in preparation period, simple in process, easy to control, capable of achieving large-scale production and wide in application market.

Description

technical field

[0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for preparing a whisker-toughened composite coating by a liquid-phase spraying process. Background technique

[0002] Thermal barrier coatings are widely used on the surface of hot-end components such as aero-engines, gas turbines, and high-end control valves. They are functional coatings with thermal protection and thermal barrier effects. The application of thermal barrier coating greatly improves the service life and thermal efficiency of the engine. However, due to the characteristics of high brittleness and low fracture toughness of ceramic coatings, cracks inevitably occur during long-term service, and the coating will eventually peel off and fail as the cracks expand. With the requirements of higher thrust-to-weight ratio and heat transfer ratio, traditional ceramic coatings are increasingly unable to meet the needs of future development. ...

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