Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment
| Autor: | Guan-Jun Yang, Liu Hong, Chang-Jiu Li, Bang-Yan Zhang, Tong Xu, Cheng-Xin Li, Guo-Hui Meng |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Controlled atmosphere
Materials science Oxide 02 engineering and technology engineering.material 01 natural sciences Isothermal process Metal Thermal barrier coating chemistry.chemical_compound Coating 0103 physical sciences Materials Chemistry Lamellar structure 010302 applied physics Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Surfaces Coatings and Films chemistry Chemical engineering visual_art engineering visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 347:54-65 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2018.04.068 |
| Popis: | MCrAlY bond coats with high oxidation resistance are essentially important for improving the life-time of thermal barrier coatings (TBCs). In this study, highly oxidation resistant MCrAlY bond coats were prepared by a cost-effective approach involving air plasma spraying (APS) followed by a controlled atmosphere heat treatment (a diffusion treatment performed in a furnace filled with Ar). The results confirmed that a pure α-Al2O3 thermally grown oxide (TGO) was successfully formed on the surface of the heat-treated APS bond coats during isothermal oxidation. The oxidation resistance of the resulting APS bond coats was as high as that of low-pressure plasma sprayed bond coats, which are very expensive. The high oxidation resistance of the APS bond coats fabricated in this study can be attributed to the structural changes of the interface between the splats inside the coating. During the controlled atmosphere heat treatment, the lamellar oxides present between the splats within the as-sprayed APS bond coats converted into isolated oxide particles, and the metal elements could diffuse freely within the coating after the healing of the interface between the lamellar splats. The effect of the changes in the interfacial microstructure of the bond coats on the growth of the TGO was discussed. |
| Databáze: | OpenAIRE |
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