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1525 |
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Monday, June 02, 2008, Room 05 11:50 AM New Equipment 1 Latest developments in thermal spray equipment, modern multiple arc plasma guns, optimized powder feeder, new vacuum processes |
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Development of WC-Co coatings deposited by warm spray process |
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Pornthep Chivavibul* / National Institute for Materials Science, Japan Makoto Watanabe / National Institute for Materials Science, Japan Seiji Kuroda/ National Institute for Materials Science, Japan Jin Kawakita/ National Institute for Materials Science, Japan Masayuki Komatsu/ National Institute for Materials Science, Japan Kazuto Sato/ Fujimi Incorporated, Japan Junya Kitamura/ Fujimi Incorporated, Japan |
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The high-velocity oxy-fuel (HVOF) process is commonly used to deposit WC-Co coatings. There are some problems with this process, especially the decomposition and decarburization of WC during the spraying. To eliminate these degradation, the warm-spray process originally developed by our group was applied to deposit WC-12Co coatings. This process provides a possibility to control the flame temperature and the fabrication of WC-Co coatings can be made at lower temperature ranges that those of HVOF process. Microstructural characterization and phase analysis were carried out on deposited coatings by SEM and XRD. The results show that there is no detrimental phase such as W2C and W. The mechanical properties were also evaluated. |