Heat barrier composite plating and preparation technique thereof

Abstract

The invention discloses a heat barrier composite cladding layer which consists of a MCrAlY alloy adhesive layer, a NiAl alloy barrier layer, a ZrO2-CeO2 ceramic layer and an Al2O3 protective layer; the NiAl alloy barrier layer is arranged between the MCrAlY alloy adhesive layer and the ZrO2-CeO2 ceramic layer, and the Al2O3 protective layer is arranged on the surface of the ZrO2-CeO2 ceramic layer. The invention adopts a preparation process integrated with electrophoretic deposition, high-speed electrical spray-plating and plasma arc plating layer scanning, and has the advantages of simple operation method, quite low preparation cost, capability of realizing industrialized production and the like, and the prepared heat barrier composite cladding layer also has the advantages of low heat conductivity, low roughness of the cladding layer surface, high integration strength of the cladding layer and the matrix, good hot corrosion resistance performance, good hot oxidation resistance performance and the like, solves the difficulties of poor high-temperature oxidation resistance and high-temperature corrosion resistance of high temperature resistant parts, and prolongs the service life of the high temperature resistant parts.

Description

technical field [0001] The invention relates to a thermal barrier composite coating and its preparation process, in particular to a thermal barrier composite coating structure on a high temperature resistant component with high temperature corrosion resistance and high temperature oxidation, and high bonding force with the substrate and its Preparation Process. Background technique [0002] With the rapid development of modern industry and technology, marine or power station gas turbines and large civil aircraft engines are developing towards high flow ratio, high thrust-to-weight ratio, and high turbine inlet temperature. The airflow circulates around the blades, destroying and blowing off the protective oxide film on the parts, which intensifies corrosion. High-temperature equipment such as marine gas turbines and large civil aircraft engines working at sea or offshore, hot-end parts (such as blades) work under gas conditions, will absorb Na from seawater 2 SO 4 , NaCl ...

AI Technical Summary

Problems solved by technology

Although the plasma spraying method has a wide range of applications, there are pores and unmelted powder particles in the coating, which will affect the mechanical properties of the coating. At the same time, they will also become channels for corrosive gases, oxidizing the intermediate layer, and causing thermal barrier coatings. Failure; the cost of the electron beam physical vapor deposition (EB-PVD) method is high, and the premature peeling off of the coating during service is always a problem that plagues its development. Although many achievements have been made in the experiment, it is not yet industrialized implement

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