Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8029306 | Surface and Coatings Technology | 2013 | 8 Pages |
Abstract
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 100Â 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Gang-Chang Ji, Hong-Tao Wang, Xiao Chen, Xiao-Bo Bai, Zeng-Xiang Dong, Fen-Gen Yang,