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| Abstract No.: |
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Scheduled at:
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Thursday, May 22, 2014, Hall H3 2:20 PM
Cold Gas Spraying 3
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| Title: |
Determination of optimum cold spray parameter
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| Authors: |
Thomas Klassen / Helmut Schmidt University
Institute for Materials Technology, Germany
Frank Gärtner* / Helmut Schmidt University Institute for Materials Technology, Germany
Hamid Assadi/ Helmut Schmidt University Institute for Materials Technology, Germany
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| Abstract: |
Continuous improvements of cold spray equipment and the wider range of accessible process gas pressures and temperatures have a significant impact on the quality of coatings. Based on a comprehensive understanding of the influence of different conditions on the acceleration and bonding of impacting particles, optimum process and impact parameters for achieving high quality coatings can be determined by relating the impact velocity to the required critical velocity. The resulting unifying process variable enables a tuning potential to consider complex interdependencies between several process conditions. For example, for most high strength materials, higher impact temperatures and higher impact velocities are desired. However, detailed analysis shows that, for some materials, lower pressures actually yield better results. This obviously applies to materials with limited deformability at higher strain rates, but also to materials with low density and/or powder cuts with smaller particle sizes. These findings will be explained and the basic concept will be elucidated by selected application examples.
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