Effects of Al2O3 Doping on Microstructure and Wear Behavior of Plasma-Sprayed CoCrAlTaY-Al2O3 Cermet Coatings

文献类型： 外文期刊

第一作者： Lin, Yue

作者： Lin, Yue;Xue, Zhaolu;Huang, Wen;Zhang, Shihong;Huang, Wen

作者机构：

关键词： Al2O3 doping; atmospheric plasma spraying; CoCrAlTaY coating; mechanical properties; wear behavior

期刊名称：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE （ 影响因子：2.0； 五年影响因子：2.3 ）

ISSN： 1059-9495

年卷期： 2025 年

页码：

收录情况： SCI

摘要： MCrAlY-based coatings are widely applied in metallurgy and aerospace engineering. In the present work, a CoCrAlTaY-Al2O3 spraying powder was prepared by spray granulation and vacuum sintering. Subsequently, (1-x) CoCrAlTaY-xAl(2)O(3) (x = 0, 10, 20, 30%, wt.%) cermet coatings were fabricated by atmospheric plasma spraying (APS) technology, and the effects of Al2O3 doping concentrations on the microstructure, phase composition, mechanical properties, and wear behavior of the cermet coatings were investigated. The results showed that most of the CoCrAlTaY-Al2O3 spraying powder particles were spherical with uniform composition and diameters ranging from 15 to 45 mu m. The CoCrAlTaY-Al2O3 coating was relatively dense and contained few pores. Al2O3 doping had no significant effect on the phase composition of the coating that was mainly composed of Al5Co2, Cr, alpha-Al2O3, theta-Al2O3 and gamma-Al2O3. As the content of Al2O3 increased, the Vickers hardness and porosity of the cermet coating gradually increased. The bonding strength of CoCrAlTaY coating decreased after adding Al2O3, and the coating with 30% doping Al2O3 had a maximum hardness of 758.3 HV0.3 and a relatively high bonding strength of 48.7 MPa. The wear mechanism of the CoCrAlTaY-Al2O3 coating was mainly abrasive wear at room temperature, and the doping of Al2O3 reduced the amount of adhesive wear. Aa the Al2O3 doping content increased, the wear volume and wear rate of the grinding ball gradually increased, implying that the wear performance of the CoCrAlTaY-Al2O3 coating was significantly improved after adding Al2O3.

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