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| Abstract No.: |
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Scheduled at:
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Thursday, September 29, 2011, Saal C2.2 2:50 PM
Pre- & Post-Treatment 3
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| Title: |
Mechanical properties of heat treated cold sprayed pure titanium coatings
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| Authors: |
Wilson Wong* / McGill University, Canada
Eric Irissou / National Research Council Canada - Industrial Materials Institute, Canada
Jean-Gabriel Legoux/ National Research Council Canada - Industrial Materials Institute, Canada
Stephen Yue/ McGill University, Canada
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| Abstract: |
Cold spray processing of titanium (Ti) powder is a very active field of research. Although a 100% dense coating can be obtained with helium as the propellant gas, when nitrogen is used, the density is currently limited to around 99%. For certain high performance automobile and aerospace applications, even 1% porosity makes these coatings unacceptable. Although in general, post-treatment is known to improve the mechanical properties of cold sprayed coatings, there has been very little research on improving these properties on cold sprayed Ti coatings via post-treatments. This research examines systematically the effect of heat treatment on the mechanical properties of Ti cold sprayed coatings. Nitrogen gas was employed throughout the deposition process of the Ti coatings. Gas temperature and pressure were adjusted to achieve maximum particle impact velocity. Four different heat treatment temperatures were performed under argon atmosphere on as-cold sprayed Ti coatings at 200, 400, 600, and 800°C for four hours each. All coatings were assessed for microhardness, deposition efficiency, porosity, and bonding properties. In addition, the feedstock powder and cold sprayed coatings were characterized with SEM and XRD. Results demonstrated differences in mechanical and microstructural properties among the heat treated and as-sprayed coatings.
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