Influence of process variables on the qualities of detonation gun sprayed WC-Co coatings

doi:10.1016/j.msea.2005.08.008

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	Influence of process variables on the qualities of detonation gun sprayed WC-Co coatings
	Du, H; Hua, WG; Liu, JG; Gong, J; Sun, C; Wen, LS
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2005-11-05
卷号	408 期号:1-2 页码:202-210
关键词	detonation gun spraying WC-Co coating microstructure adhesion Vickers hardness fracture toughness
ISSN号	0921-5093
DOI	10.1016/j.msea.2005.08.008
通讯作者	Sun, C()
英文摘要	Detonation gun (D-gun) spraying is one of the most promising thermal spray technology for high quality wear resistant coatings. Of all the ceramic materials that can be D-gun-sprayed, WC is the most widely established and these coatings have already gained industrial acceptance for diverse applications. The use of D-gun-sprayed WC-Co coating as protection against aggressive environment requires a precise knowledge of the influence of spraying process parameters on the coating characteristics and properties (porosity, adherence, roughness, hardness, etc.). In this article, experimental results are presented in terms of the structure, including surface roughness, XRD patterns and porosity, as well as adhesion strength, hardness, and fracture toughness of D-gun-sprayed WC-Co coatings as a function of spraying distance from nozzle exit to substrate and ratio of O-2:C2H2. It is found that both the spraying parameters influence structure and properties of D-gun-sprayed WC-Co coatings. The decarburization of WC-Co powders during the spraying is little even when the highest oxygen-fuel ratio was employed. When the higher oxygen-fuel ratio was employed, hardness and adhesion increase, while, porosity and fracture toughness decrease, which can be attributed to the higher temperature and velocity feed powders obtained from the detonation wave. On the other hand, denser microstructure, higher adhesion strength and higher hardness appear when the coating was deposited at spraying distance of 110-20 turn, while fracture toughness is a little lower, which may come from the best compromise of decreasing velocity and lagging of heat transfer process for the particles to obtain a good molten state. (c) 2005 Elsevier B.V. All rights reserved.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000233524700030
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/84038]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sun, C
作者单位	Chinese Acad Sci, Met Res Inst, Div Surface Engn Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Du, H,Hua, WG,Liu, JG,et al. Influence of process variables on the qualities of detonation gun sprayed WC-Co coatings[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2005,408(1-2):202-210.
APA	Du, H,Hua, WG,Liu, JG,Gong, J,Sun, C,&Wen, LS.(2005).Influence of process variables on the qualities of detonation gun sprayed WC-Co coatings.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,408(1-2),202-210.
MLA	Du, H,et al."Influence of process variables on the qualities of detonation gun sprayed WC-Co coatings".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 408.1-2(2005):202-210.