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2250 |
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Tuesday, May 04, 2010, Olivia Room 12:20 PM Hard Chrome Replacement |
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Microstructure and enhanced mechanical properties of WC-Co coatings obtained by warm spraying |
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Seiji Kuroda* / National Institute for Materials Science, Japan Ganesh Sundra Raman / National Institute for Materials Science, Japan Makoto Watanabe/ National Institute for Materials Science, Japan Masayuki Komatsu/ National Institute for Materials Science, Japan Kazuto Kitamura/ Fujimi Incorporated, Japan Junya Kitamura/ Fujimi Incorporated, Japan |
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WC-Co cermet coatings were fabricated by using Warm Spraying, which is a modification of HVOF spraying to lower the temperature of the propellant gas below the melting point of Co. By changing the processing parameters, specimens were prepared for hardness, toughness, abrasion wear and particle erosion tests. Their microstructures were examined by SEM and XRD. The microstructure clearly showed the effects of suppression of the dissolution of WC into the Co phase, which is the major cause of embrittlement of the conventional HVOF sprayed WC-Co coatings. By a good combination of adequate feedstock powder and processing parameters, it was found possible to take advantage of fine WC grain size to surpass the wear performances of conventional HVOF coatings. |