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3785 |
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Wednesday, May 21, 2014, Hall F 2:00 PM Suspension Spraying 1 |
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New design of a spray torch for high velocity suspension flame spraying |
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Andreas Rempp* / IFKB University of Stuttgart, Germany Andreas Killinger / Institute for Manufacturing Technologies of Ceramic Components and Composites (IFKB), Germany Thomas Schläfer/ GTV Verschleißschutz GmbH, Germany Rainer Gadow/ Institute for Manufacturing Technologies of Ceramic Components and Composites (IFKB), Germany |
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In the last decade the HVSFS process has been established in the scientific area. The benefits of using fine powders on the coating structures and the mechanical properties for various coating materials and applications were shown. Until now the step from the laboratories to industrial scale is missing due to the lack of specific spraying equipment which allows a reliable and safe operation. The research work presented here is focused on the development of specialized spraying equipment for HVSFS. Therefore a HVSFS- torch and a mechanical suspension feeding system have been designed and built up. The new torch layout is based on the TopGun G system regarding the exterior design and the gas mixing unit. The gas inlet unit, feedstock injection and combustion chamber/nozzle have been redesigned. Three different injection types based on simple orifice and two fluid nozzle designs with integrated cooling systems were built. The functionality and reliability of the new torch and feeding system has been evaluated by testing different torch set-ups with suspensions containing submicron and nano oxides and carbides. |