Heat Treatment of Metals ›› 2022, Vol. 47 ›› Issue (8): 266-270.DOI: 10.13251/j.issn.0254-6051.2022.08.044

• SURFACE ENGINEERING • Previous Articles     Next Articles

Tribological properties of plasma-sprayed boron nitride nanoplatelet reinforced Ni3Al composite coating

Lou Xuyao1, Zhou Bo1, Song Ying2, Lu Xiaolong3   

  1. 1. The Boiler and Pressure Vessel Safety Inspection Institute of Henan Province, Zhengzhou Henan 450016, China;
    2. Department of Mechanical Engineering, Changshu Institute of Technology, Changshu Jiangsu 215500, China;
    3. School of Mechanical and Electrical Engineering, Soochow University, Suzhou Jiangsu 215137, China
  • Received:2022-04-28 Revised:2022-06-25 Online:2022-08-25 Published:2022-09-19

Abstract: Boron nitride nanoplatelet (BNNP) reinforced Ni3Al composite coatings were fabricated by using plasma spray. The results show that the main phases of the coating contain in-situ synthesized Ni3Al and trace amounts of Al2O3. Compared with monolithic Ni3Al coating, the BNNP/Ni3Al composite coating displays a good combination of improved wear resistance and relatively low coefficient of friction, especially the wear resistance of the composite is increased up to 1.5 times. The addition of BNNPs induces a change of the dominant wear mechanisms from brittle fracture and three-body abrasive wear associated with the monolithic Ni3Al coating to mild abrasive wear along with the BNNP/Ni3Al composite coating. Furthermore, the formation of BNNP tribolayer on the worn surface of the composite coating not only contributes to the self-lubrication function but also significantly suppresses contact damage of both the composite coating and its counterpart.

Key words: boron nitride nanoplatelet, Ni3Al composite coating, tribological properties, plasma spraying

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