INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF–LUBRICANT COATING

Acta Metall Sin

2009, Vol. 45

Issue (8): 943-948 DOI:

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INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF–LUBRICANT COATING

XU Na ^1;2; ZHANG Jia ²; HOU Wanliang ²; QUAN Mingxiu ²; LI Rongde ¹; CHANG Xinchun ²

1. Shenyang University of Technology; Shenyang 110178
2. Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

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XU Na ZHANG Jia HOU Wanliang QUAN Mingxiu LI Rongde CHANG Xinchun. INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF–LUBRICANT COATING. Acta Metall Sin, 2009, 45(8): 943-948.

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Abstract

Foil air bearings are self–acting hydrodynamic bearings relying on solid lubricants to reduce friction and wear during sliding at start–up and shut–down when speeds are too low to allow the formation of a hydrodynamic air film. The service temperature of traditional solid lubricants such as graphite, PTFE and MoS₂ is limited to only about 300 ℃, The NiCr–Cr₂O₃–Ag–BaF₂/CaF₂solid lubricants can make foil air bearings run from room temperature to 650 ℃ In this paper, the NiCr–Cr₂O₃–Ag–BaF₂/CaF₂ high temperature solid self–lubricant coatings were fabricated on GH4169 matrix using plasma spray technology. Microstructures and adhesive strengths of the coatings as sprayed and treated at 500, 650 and 800 ℃ were analyzed by SEM, XRD and tensile test. The results show that the as–sprayed coating consists of Ni(Cr) phase, Cr₂O₃ phase, Ag phase and (Ba,Ca)F phase and has coarse lamellar–likstructures, the adhesive strength reaches 30.4 MPa. After heat treatments at 500 and 650 ℃ (Ba, Ca)F phase transforms into BaF₂/CaF₂ phase, meanwhile the BaF₂/CaF₂becames compacted. The formatin and growth of lots of black Cr₂Oand iO precipitations make Ni(Cr) phase refine. After heat treatment at 650 ℃ for 12 or 24 h, the adhesive strength increases to 46.5 MPa. But after heat treatment at 800 ℃ BaF₂ was oxidized, which makes the microstructures loose and the porosities are formed in a large area. The adhesive strength is decreased evidently.

Key words: high temperature solid lubricant coating heat treatment microstructure adhesive strength plasma spray

Received: 19 March 2009

ZTFLH:

TG174.442

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	XU Na
	ZHANG Jia
	HOU Mo-Liang
	QUAN Meng-Xiu
	LI Rong-De
	CHANG Xin-Chun

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I8/943

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