钇(Y)元素强化的CoCrNiFe基高温自润滑复合涂层的摩擦学性能

doi:10.11896/cldb.21010202

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Abstract The CoCrNiFe matrix composite coatings with Y (0.5wt%, 1.0wt%, 2.0wt%) were prepared on the surface of GH4169 nickel alloy by powder metallurgy technology. The effects of Y on the microstructure and tribological properties of the coatings were systematically investigated, and the Y content was optimized. The high-temperature tribological behaviors were tested by using ball-on-disc tribo-tester from room tempe-rature to 1 000 ℃ sliding against Si₃N₄ ball. The XRD and SEM technologies were used to analyze the microstructure and high-temperature wear mechanism of the coatings. The main phases of the coatings consisted of γ-Co(fcc), ε-Co(hcp), FeNi₃, Ni_2.9Cr_0.7Fe_0.36 and Y₂O₃. The Y element reacted with the adsorbed oxygen and other oxide impurities on the surface of metal particles during the sintering, so the grain boundaries were purified. The Y₂O₃ could effectively enhance the hardness and compactness of the coatings, and the hardness and compactness of the coatings were improved with the increase of Y element content. The friction coefficients of the coatings first decreased and then increased with the increase of temperature, and the coatings showed the minimum friction coefficients at 800 ℃. However, the wear rates had an opposite trend. From 20 ℃ to 600 ℃. The wear rates of the coatings were 23.64%—95.90% lower than that of the substrate, and the wear rate was about 3×10^-5 mm³/(N·m) at 1 000 ℃. It was ascribed to the high hardness and the lubricating effect of oxide film reinforced by Y₂O₃. Generally, the composite coating with 1.0wt% Y had the best tribological properties at high temperature. The wear mechanism of the coatings was abrasive wear and slight plastic deformation at low temperature while oxidation wear was the wear mechanism at high temperature.

Key words： cobalt matrix composite coating high temperature friction wear

Published: 25 April 2022 Online: 2022-04-27

CLC number:

TG174.44

Fund:National Natural Science Foundation of China (51775365) and the National Natural Science Foundation Youth Fund of China (51405329).

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	Articles by authors
	BIAN Canxing
	QIAN Yu
	CUI Gongjun
	LIU Yanping
	KOU Ziming

Cite this article:

BIAN Canxing,QIAN Yu,CUI Gongjun, et al. Tribological Properties of CoCrNiFe Matrix High-temperature Composite Coatings Reinforced by Yttrium Element[J]. Materials Reports, 2022, 36(8): 21010202-8.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21010202 OR http://www.mater-rep.com/EN/Y2022/V36/I8/21010202

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