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| Abstract No.: |
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Scheduled at:
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Wednesday, May 05, 2010, Hullet Room 9:20 AM
Cold Spraying 5
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| Title: |
Investigation of impact behavior of cold sprayed large annealed copper particles and characterizations of coatings
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| Authors: |
Wenya Li / School of Materials Science and Engineering,
Northwestern Polytechnical University,, China
Xueping Guo / LERMPS, UTBM, France
Hanlin Liao*/ LERMPS, UTBM, France
Christian Coddet/ LERMPS, UTBM, France
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| Abstract: |
In this research, large gas-atomized copper powder was annealed in a vacuum circumstance to avoid to the greatest extent the effect of grain boundaries on the high velocity impact behavior of particles during cold spraying. Both the as-atomized and the annealed Cu powders were deposited by cold spraying with respect to the single impacts and coating deposition under different gas conditions in which various particle velocities and temperatures of particles could be obtained. In addition, the rebounded copper particles were collected for morphology analysis compared to the adhered particles. The results show that the impact behavior of annealed Cu particles is significantly different from that of the as-atomized ones. The possible impact fusion and fracture at the interfaces of particles were investigated for a better understanding of the particle deposition behavior in cold spraying. Coatings with different thicknesses were also characterized by Vickers microhardness, optical microscopy, scanning electron microscopy.
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