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4767 |
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Wednesday, May 11, 2016, Room 3E 10:20 AM Cold Gas Spraying II |
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Effect of gas pressure on interfacial bonding features of the cold sprayed Ni coatings on Al substrate |
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Y. Xie / Université de technologie Belfort-Montbéliard, FRANCE M. Planche*/ Université de Technologie de Belfort-Montbéliard, FRANCE R. Raoelison/ Université de Technologie de Belfort-Montbéliard, FRANCE P. Herve/ Université Paris Ouest Nanterre la Défense, , FRANCE C. Verdy/ Université de Technologie de Belfort-Montbéliard, FRANCE H. Liao/ Université de Technologie de Belfort-Montbéliard, FRANCE |
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In this study, isolated impacted of Ni particles were obtained on polished Al substrates at different gas pressures. They were analysed regardless particle/substrate interface after heat treatment. Relationships between the interfacial bonding features and gas pressures were discussed. It was found that metallurgical bonding area plays an important factor that induces interfacial atomic diffusion. It revealed also that higher gas pressure increased intermetallic phase area leading to enhance adhesion between the coating and the substrate. In addition, the corresponding coatings were formed at the same conditions. As the gas pressure increased, the porosity decreased, thus enabling the formation of denser coating layer. Hardness values of coating increased by work hardening and denser coating. The relationships between the adhesion strength of coating and the gas pressure were also studied. The results showed that stronger adhesion strength can be obtained with higher gas pressure. |