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1141 |
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Wednesday, June 04, 2008, Room 05 8:40 AM Characterization 1 Modern characterization offers a good possibility for proofing the reliability and the performance of thermal sprayed coatings |
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Plasma spraying of tungsten carbide cobalt coatings by the water-stabilized system WSP® |
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Pavel Ctibor / Instritute of Plasma Physics ASCR, Czech Republic Pavel Ctibor* / Institute of Plasma Physics, Czech Republic Michaela Ka?parová/ Skoda Research, Czech Republic Jeremy Bellin/ Engineering National School of Limousin, France Emmanuel Le Guen/ Engineering National School of Limousin, France |
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Tungsten carbide ? cobalt powders (WC-17wt.%Co) were plasma sprayed by water-stabilized system WSP®. A matrix of experiments with variable feeding distances and spray distances was realized. Thinner coatings were carried out on carbon steel substrates and thicker coatings on stainless steel substrates to compare better cooling conditions ? the former case - with worse cooling conditions. Basic characterization of coatings was done by XRD, SEM and light microscopy plus image analysis. Microhardness was measured on polished cross sections. In main focus of our investigation were resistances against wear at dry as well as wet conditions. The appropriate tests were performed in set-ups based on ASTM G65 and G75 respectively. Influence of spray parameters onto coating wear performance was observed. The results of mechanical tests are discussed in connection with changes of phase composition and with the character of coating?s microstructure. |