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2981 |
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The influence of metal binder of WC cermet powder for cold spraying |
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Junya Kitamura / Fujimi Incorporated, Japan Kazuto Sato* / Fujimi Incorporated, Japan Down Seo/ Tohoku University, Japan Haruhiko Furukawa/ Fujimi Incorporated, Japan Kazuhiro Ogawa/ Tohoku University, Japan |
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From the appearance of HVOF thermal spray system on 1980s, WC cermet coatings have been used as an antiwear coating in many industrial manufacturing. Recently, WC cermet spray materials were applied to new thermal spray method such as Warm Spray and Cold Spray under research phase. In HVOF spraying, WC-Co or WC-Ni series powder are used as standard contents. Ni and Co are binder metal for WC because of good wettability and suitable melting point. On the other hand, Warm Spray and Cold spray are lower temperature process than HVOF. It is considered that any other factors of metal material such as hardness, toughness and crystal phase should be investigated in Warm Spray and Cold Spray. In this study, WC with Co, Ni or Fe powders were sprayed by Cold Spray to investigate the influence of binder metal for spray efficiency and coating property. It is cleared that Ni and Fe were superior to Co in spray efficiency and coating property. The detail of above reason was under investigation, however, hardness of binder metal is expected to be an important factor for WC cermet cold spraying. |