Tribological behaviour of HVOF sprayed near-nanostructured and microstructured WC-17wt.%Co coatings
A ‘duplex cobalt coated’ near-nanostructured WC-17wt.%Co powder was used to produce nanostructured coatings. The tribological performance of this coating was compared with a commercial WC-17wt.%Co microstructured coating using a pin-on-plate method (ASTM G133-05 standard) with a data acquisition sof...
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Veröffentlicht in: | Surface & coatings technology 2011-12, Vol.206 (6), p.1077-1084 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A ‘duplex cobalt coated’ near-nanostructured WC-17wt.%Co powder was used to produce nanostructured coatings. The tribological performance of this coating was compared with a commercial WC-17wt.%Co microstructured coating using a pin-on-plate method (ASTM G133-05 standard) with a data acquisition software to perform a real time analysis of the sliding wear process. The wear rate was studied using loads from 10 to 60
N and for various sliding distances. The metallurgical analysis of the coatings showed that the duplex Co coated powder could be sprayed to produce dense coating. Furthermore, the near-nanostructured coating showed better fracture toughness values and this corresponded to a difference in wear mechanism between the two types of coatings. The greater “plasticity” in the near-nanostructured coating was recorded as microgrooves in the wear tracks and, in comparison, brittle fracture was observed in the wear tracks produced on the microstructured coating.
► Development of a novel Duplex Co-coated HVOF near-nanostructured WC-17wt.% coating. ► Dense coating formation contributing to low internal porosity in the novel coating. ► Improved fracture toughness and microhardness of near-nanostructured coating. ► Pin-on-plate sliding wear test under different loads and wear conditions. ► Two different wear mechanisms in near-nanostructured and microstructured coatings. |
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ISSN: | 0257-8972 1879-3347 |
DOI: | 10.1016/j.surfcoat.2011.07.075 |