Effect of thermal spraying process on properties of NiCrFeAl/hBN composite coating

doi:10.13251/j.issn.0254-6051.2022.06.039

Abstract

Abstract: In order to improve the mechanical properties of oxyacetylene flame sprayed NiCrFeAl/hBN composite coating, L₉(3⁴) orthogonal test method was used and taking the surface Rockwell hardness and bonding strength as the main judgment indexes, the influence order of the three main parameters (oxygen-fuel ratio, spraying speed, spraying spacing) of oxyacetylene flame spraying were analyzed, and the performance of the coating prepared by the optimal process was verified. The results show that the spraying spacing is the main factor affecting the performance of the coating, and the optimal process parameters are O₂/C₂H₂ of 26/20, spraying speed of 600 mm/s, spraying spacing of 12 mm, which lead to more uniform internal structure of the coating, better melting bonding, smooth surface, less unmelted particles, and the average bonding strength of the coating is up to 10.3 MPa, the average surface Rockwell hardness is 54.9 HR15Y.

Key words: oxyacetylene flame spraying, NiCrFeAl/hBN coating, orthogonal test, surface Rockwell hardness, bonding strength

CLC Number:

TG174.4

Zhou Zimin, Xiong Shengjian, Chen Haohui, Li Zhang, Wang Changliang, Guo Mengqiu, Cui Xiufang, Jin Guo. Effect of thermal spraying process on properties of NiCrFeAl/hBN composite coating[J]. Heat Treatment of Metals, 2022, 47(6): 208-215.

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