期刊
SURFACE & COATINGS TECHNOLOGY
卷 235, 期 -, 页码 536-543出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.08.021
关键词
Multimodal WC-12Co coating; Cold spray; Deformation behavior; Microstructure; Property
资金
- National Natural Science Foundation of China [50961007, 51001056]
- Natural Science Foundation of Jiangxi Province [20114BAB206019, 2010GQC0117]
- Science and Technology Project of Jiangxi Educational Bureau [GJJ13721, GJJ12610, GJJ12622]
- Industrial Technology Research and Development Project of Jiangxi Education Bureau [KJLD12096]
- Key Technologies R & D Program of Jiujiang [[2012]84]
In present work, the deposition behaviors of individual bimodal WC-12Co particles impacting on stainless steel and WC-12Co substrates were investigated. The microstructure and properties of the cold-sprayed WC-12Co coating were characterized. The results showed that the WC-12Co particles partially penetrated into the stainless steel substrate. Flattening of the particles occurred with splashes at its periphery when impacting on the WC-12Co substrate. A movement of small WC particles accompanied with a plastic flow of the Co binder occurred during the impacting and flattening process of the powders. The sprayed coating exhibited a characteristic microstructure with a wide range of WC particle sizes varying from less than 100 nm up to a micron scale. The obtained multimodal coating exhibited both a high hardness and high fracture toughness, e.g. the microhardness is similar to that of a cold sprayed nano WC-12Co coating and the fracture toughness is comparable to that of a bulk material of micro WC-12Co. The cold sprayed coating exhibited a greatly enhanced wear resistance in comparison to the conventional high-velocity oxy-fuel (HVOF) sprayed WC-12Co coating. (C) 2013 Elsevier B.V. All rights reserved.
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