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3816 |
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Thursday, May 22, 2014, Hall H3 3:00 PM Cold Gas Spraying 3 |
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Influence of substrate temperature on adhesion strength of cold sprayed coatings |
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Yuta Watanabe* / Toyohashi University of Technology, Japan Chisato Yoshida / Toyohashi University of Technology, Japan Keisuke Atsumi/ Toyohashi University of Technology, Japan Motohiro Yamada/ Toyohashi University of Technology, Japan Masahiro Fukumoto/ Toyohashi University of Technology, Japan |
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Cold spraying is a promising process to fabricate functional coatings. Conventional thermal spraying requires molten or semi-molten, feedstock powder materials, especially in high temperature plasma or gas flame spraying technique, before deposition onto a substrate. The most important factor to deposit a particle through cold spraying is known as the critical velocity. When the particle velocity is beyond the critical velocity, the plastic deformation of both sprayed metallic particle and metallic substrate cause the removal of surface oxide layers and newly-formed surfaces are explored. The newly-formed surface yields the metallic bond, and then the cold spray deposition can be obtained. Therefore, the substrate conditions also must be considered to understand the cold spray process. In this study, the influence of substrate temperature on adhesion strength of coatings was investigated by substrate pre-heating. The adhesion strength was examined by a shear adhesion test. The shear adhesion test showed that the substrate pre-heating enhances the adhesion strength between dissimilar materials. As the causes of these, a thermal stress was suggested. |