Abstract
The bond coat of a NiCrAlY thermal barrier coating plays an important role in solving the thermal expansion mismatch between a metal matrix and a ceramic layer and in improving the oxidation resistance of the whole thermal barrier coating. However, the NiCrAlY bond coat prepared by low-pressure plasma spraying is not conducive to its oxidation resistance because its lamellar structure is loose, porous and the surface is rough. To improve the oxidation resistance of the bond coat, the NiCrAlY bond coat prepared by plasma spraying was modified by high-current pulsed electron beam with different energy densities. Under the electron beam irradiation, the surface of the coating became smooth, and there was a 3–5 μm thick remelting layer on the surface. Under the irradiation, the thickness of the thermal growth oxide layer decreased, and the oxidation resistance was significantly improved, the oxidation product being mainly Al2O3.
Highlights
With the development of aerospace technology, the service temperature of hot-end components, such as engine turbine blades, is getting higher
The NiCrAlY bond coat prepared by low‐pressure plasma spraying has a lamellar structure, loose and porous
This loose porous structure is conducive to the entry of O and other elements, forming an over‐thick thermal growth oxide (TGO) layer, which is not conducive to improve the oxidation resistance of the coating
Summary
With the development of aerospace technology, the service temperature of hot-end components, such as engine turbine blades, is getting higher. The bond coat of thermal barrier coatings prepared by atmospheric pressure and low-pressure plasma spraying methods has a lamellar structure, which is conducive to the improvement of thermal insulation performance of thermal barrier coatings. To improve the oxidation resistance of the NiCrAlY bond coat and the porous structure of the coating, the energy beam irradiation can be used to reduce the surface roughness, while the high-current pulsed electron beam technology is a good choice [12,13,14,15]. The NiCrAlY bond coat prepared by low-pressure plasma spraying was irradiated by high-current pulsed electron beam, and the effects of electron beam irradiation on the structure and oxidation resistance of the coating were studied
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