Abstract No.:
2629

 Title:
Influence of particle velocity on adhesion strength of cold spray deposits

 Authors:
Renzhong Huang* / Plasma Giken Co. Ltd., Japan
Hirotaka Fukanuma / Plasma Giken Co. Ltd., Japan

 Abstract:
The adhesion mechanism of deposit/substrate interface prepared by cold spray method has not been fully clarified up to now. It seems that the adhesion strength is mainly determined by the mechanical (including the plastic deformation of particle and substrate) and thermal interaction between the particle and substrate when the particles impact onto the substrate with high velocity. In this study, the copper powders were tested. The particle velocity was measured with DPV-2000 and also calculated using CFD simulation. The influences of particle impact velocity on the adhesion strength were investigated. The relationships between adhesion strength of deposit/substrate interface and particle velocity were discussed. The results show that stronger adhesion strength can be obtained with the increase of particle velocity. There are two available ways to obtain higher particle velocity. One is to increase the temperature of working gas, and the other is to employ helium instead of nitrogen gas.

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