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Advances in Materials Science and Engineering
Volume 2009 (2009), Article ID 254848, 11 pages
http://dx.doi.org/10.1155/2009/254848
Research Article

Plasma Spraying and Characterization of Tungsten Carbide-Cobalt Coatings by the Water-Stabilized System WSP

1Institute of Plasma Physics ASCR, Za Slovankou 3, 182 00, Praha 8, Czech Republic
2Skoda Research Ltd., Tylova 57, 316 00 Plzeň, Czech Republic
3Engineering National School of Limoges, 16 rue Atlantis, 87068 Limoges, France

Received 17 June 2009; Revised 19 October 2009; Accepted 19 October 2009

Academic Editor: Jenn-Ming Yang

Copyright © 2009 Pavel Ctibor et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tungsten carbide-cobalt powders (WC-17wt% Co) were plasma sprayed by a water-stabilized system WSP. Experiments with variable feeding distances and spray distances were carried out. Thinner coatings were deposited on carbon steel substrates and thicker coatings on stainless steel substrates to compare different cooling conditions. Basic characterization of coatings was done by XRD, SEM, and light microscopy plus image analysis. Microhardness was measured on polished cross-sections. The main focus of investigation was resistance against wear in dry as well as wet conditions. The appropriate tests were performed with set-ups based on ASTM G65 and G75, respectively. The influence of spray parameters onto coating wear performance was observed. The results of mechanical tests were discussed in connection with changes of phase composition and with the quality of the coating's microstructure. The results show that for obtaining the best possible WC-17Co coating with WSP process, from the viewpoint of wear resistance, the desired parameters combination is long feeding distance combined with short spray distance.