A study on the mechanical and thermal shock properties of MCrAlY coating prepared by arc ion plating

SURFACE & COATINGS TECHNOLOGY

卷:413

Article

Xie, Shiming^1,2  Lin, Songsheng²  Shi, Qian²  Wang, Wei²  Song, Chen²  Xu, Wei²  Dai, Mingjiang² 

[1] Univ Bourgogne Franche Comte, UTBM, CNRS, ICB UMR 6303, F-90010 Belfort, France

[2] Guangdong Acad Sci, Inst New Mat, Key Lab Guangdong Modern Surface Engn Technol, Natl Engn Lab Modern Mat Surface Engn Technol, Guangzhou 51065, Peoples R China

关键词: MCrAlY coating;    Arc ion plating;    Microstructure;    Mechanical property;    Thermal shock property;   

DOI  :  10.1016/j.surfcoat.2021.127092

来源: Elsevier

【 摘 要 】

In this study, MCrAlY coatings with different microstructures were prepared by arc ion plating to investigate the mechanical and thermal shock properties of the coatings. The results show that arc ion plating MCrAlY coatings overall possessed similar hardness (7.66 GPa-9.20 GPa) but lower elastic modulus (119.07 GPa-148.02 GPa), compared to those prepared by conventional thermal sprayings. The microstructure of the coating had a significant impact on the thermal shock property. The coating with a columnar structure exhibited a poor thermal shock property. After the thermal shock test, the coating failed in the form of penetrating cracks, which ultimately caused stress corrosion in the substrate. A dense and laminar structure was a desirable structure for ideal thermal shock property, which could be achieved by increasing the bias voltage applied to the substrate during the preparation process of the coating. However, in that case, the oxidation resistance of the coating was decreased due to the loss of Al in the coating.

【 授权许可】

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