Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (4): 194-198.DOI: 10.13251/j.issn.0254-6051.2020.04.041

• SURFACE ENGINEERING • Previous Articles     Next Articles

High temperature friction properties of NiCoCrAlYTa-Al2O3 composite coating by atmospheric plasma spraying

Liu Haijun1, Gao Weimin1, Tao Chong2   

  1. 1. Carbon Steel Sheet Plant, JISCO Hongxing Iron & Steel Co., Ltd., Jiayuguan Gansu 735100, China;
    2. Meishan Technical Center, Baosteel Research Institute, Nanjing Jiangsu 210039, China
  • Received:2019-09-24 Online:2020-04-25 Published:2020-05-08

Abstract: NiCoCrAlYTa-Al2O3 composite coatings were prepared on 0Cr25Ni20 austenitic stainless steel by atmospheric plasma spraying (APS). The microstructure, phase composition, micro-hardness and high temperature(500 ℃) friction properties of the coatings were studied. The results show that the NiCoCrAlYTa-Al2O3 coating has typical layered microstructure and good bonding among layers. There are a large number of micropores in the coating, and the hard phase and the soft phase are dispersedly distributed, which effectively inhibits the generation and propagation of cracks during high temperature wear process. The wear resistance of the coating is significantly better than that of the austenitic stainless steel. During the high temperature wear process, oxidation products are formed on the coating surface, which actassolid lubrications. The wear failure modes of the NiCoCrAlYTa-Al2O3 coating are abrasive wear, fatigue wear and adhesion wear.

Key words: atmospheric plasma spraying (APS), NiCoCrAlYTa-Al2O3 composite coating, high temperature friction

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