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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal B2.1 11:00 AM
HVOF & Flame Spraying 1
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| Title: |
Computer controlled detonation spraying: From basic physical phenomena towards advance applications
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| Authors: |
Igor Smurov* / Ecole Nationale d'ingénieurs de Saint-Etienne (ENISE), France
Vladimir Ulianitsky / Lavrentyev Institute of Hydrodynamics SB RAS, Russia
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| Abstract: |
The ability of the detonation spraying to deposit metal coatings on ceramic surfaces is explored. Elementary processes and phenomena of coating formation and, in particular, collisions of individual metal particles with a ceramic substrate are studied theoretically and experimentally. Spraying parameters are optimized for aluminium, copper, and titan. Along with the conventional sandblasting method, other techniques employing the detonation spraying for activating ceramic surfaces in order to enhance adhesion are analyzed: machining by abrasive flow of cold particles of different materials, and heat pre-treatment by detonation pulses.
The deposition is performed on CCDS2000 apparatus which allows to automatically generate gradient structures from two different materials. Layered and layered-graded coatings are found to be appropriate for matching physical and mechanical characteristics of metallic coatings and ceramic substrates. Metallizing aluminium/copper gradient layers up to 500 µm thick are obtained on ceramics with adhesion strength up to 30 MPa. The obtained coatings have electrical conductivity of 80% of wrought material, and it is close to 100% after annealing in hydrogen atmosphere.
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