激光熔覆原位自生碳化物增强自润滑耐磨复合涂层的高温摩擦学性能

doi:10.11868/j.issn.1001-4381.2018.000409

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Abstract The NiCrBSi-Ti₃SiC₂-CaF₂-WC self-lubricating anti-wear composite coating was fabricated on TC11 alloy substrate by laser cladding. The phase compositions and microstructure were invest-igated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Microhardness was measured with a microhardness tester. Tribological proper-ties of the fabricated composite coatings were evaluated under dry sliding condition at room-temper-ature (25℃), 300℃ and 600℃, and the wear mechanism was analyzed. The results show that the mi-crostructure of the composite coatings consists of γ-Ni eutectic phase, M₂₃C₆,TiC, (Ti,W)C,Ti₅Si₃ hard phase and some Ti₃SiC₂,CaF₂,TiF₃ lubricating phase. The microhardness of laser cladding layer is improved greatly. The average microhardness of the laser cladding coating is 863.63HV_0.2, which is 2.46 times of the matrix. The friction coefficient and wear rate are lower than that of the substrate. The lowest friction coefficient and wear rate are 0.275 and 4.8×10^-5mm³·N^-1·m^-1 at 300℃, respectively.

Key words： laser cladding TC11 coating high temperature friction and wear

Received: 13 April 2018 Published: 17 May 2019

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	Articles by authors
	WANG Yong-gang
	LIU He-jian
	HUI Li
	ZHI Shan-jie
	LIU Hai-qing

Cite this article:

WANG Yong-gang,LIU He-jian,HUI Li, et al. High temperature tribological properties of laser cladding in-situ carbide reinforced self-lubricating wear resistant composite coating[J]. Journal of Materials Engineering, 2019, 47(5): 72-78.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2018.000409 OR http://jme.biam.ac.cn/EN/Y2019/V47/I5/72

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