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1375 |
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Wednesday, June 04, 2008, Room 04 8:40 AM HVOF and Flame Spraying New very hard coatings and modern powder feeding for economic dense coatings against wear and corrosion |
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Introduction to high velocity suspension flame spraying (HVSFS) |
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Andreas Killinger* / University of Stuttgart, Germany Johannes Rauch / IFKB Universität Stuttgart, Deutschland Rainer Gadow/ IFKB Universität Stuttgart, Deutschland |
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High velocity suspension flame spraying (HVSFS) has been developed to thermally spray suspensions containing micron, submicron and nano particles with hypersonic speed. For this purpose, the suspension is introduced directly into the combustion chamber of a modified HVOF torch. The aim in mind is to achieve dense coatings with a refined microstructure. Especially from nanostructured coatings superior physical properties are expected for many potential applications. Direct spraying of suspensions offers flexibility in combining and processing different materials, it is a cost saving process and allows the allocation of entirely new application fields. The paper gives an overview of the HVSFS spray method and will present some actual results that have been achieved by spraying different ceramic and cermetic materials. The future potential and impact of this spray technique for various industrial applications will be discussed. |