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

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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 1; Hou Wanliang 1; Quan Mingxiu 1; Li Rongde 2; Chang Xinchun 1
通讯作者	Chang Xinchun(xcchang@imr.ac.cn)
	2009-08-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	45 期号:8 页码:943-948
摘要	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 MoS(2) is limited to only about 300 degrees C. The NiCr-Cr(2)O(3)-Ag-BaF(2)/CaF(2) solid lubricants can make foil air bearings run from room temperature to 650 V. In this paper, the NiCr-Cr(2)O(3)-Ag-BaF(2)/CaF(2) 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 degrees C were analyzed by SEM, XRD and tensile test. The results show that the as-sprayed coating consists of Ni(Cr) phase, Cr(2)O(3) phase, Ag phase and (Ba,Ca)F phase and has coarse lamellar-like structures, the adhesive strength reaches 30.4 MPa. After heat treatments at 500 and 650 degrees C, (Ba, Ca)F phase transforms into BaF(2)/CaF(2) phase, meanwhile the BaF(2)/CaF(2) becames compacted. The formation and growth of lots of black Cr(2)O(3) and NiO precipitations make Ni(Cr) phase refine. After heat treatment at 650 degrees C for 12 or 24 h, the adhesive strength increases to 46.5 MPa. But after heat treatment at 800 degrees C BaF(2) was oxidized, which makes the microstructures loose and the porosities are formed in a large area. The adhesive strength is decreased evidently.
关键词	high temperature solid lubricant coating heat treatment microstructure adhesive strength plasma spray
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000269601400008
出版者	SCIENCE PRESS
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/97614
专题	中国科学院金属研究所
通讯作者	Chang Xinchun
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Shenyang Univ Technol, Shenyang 110178, Peoples R China
推荐引用方式 GB/T 7714	Xu Na,Zhang Jia,Hou Wanliang,et al. INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF-LUBRICANT COATING[J]. ACTA METALLURGICA SINICA,2009,45(8):943-948.
APA	Xu Na,Zhang Jia,Hou Wanliang,Quan Mingxiu,Li Rongde,&Chang Xinchun.(2009).INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF-LUBRICANT COATING.ACTA METALLURGICA SINICA,45(8),943-948.
MLA	Xu Na,et al."INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND ADHESIVE STRENGTH OF HIGH TEMPERATURE SOLID SELF-LUBRICANT COATING".ACTA METALLURGICA SINICA 45.8(2009):943-948.