Abstract No.:	5226
Scheduled at:	Friday, June 09, 2017, Hall 27 11:20 AM Suspension Spraying III
Title:	High velocity precursor and suspension flame spraying of metal coatings
Authors:	Peter Krieg* / University of Stuttgart, Germany Andreas Killinger / University of Stuttgart - Institute for Manufacturing Technologies of Ceramic Components and Composites, Deutschland Jan Luth/ obz innovation gmbh, Deutschland Max Winkelmann/ obz innovation gmbh, Deutschland Fabian Trenkle/ obz innovation gmbh, Deutschland Rainer Gadow/ University of Stuttgart - Institute for Manufacturing Technologies of Ceramic Components and Composites, Deutschland
Abstract:	Metallic coatings play a significant role in various industries: silver has the highest electrical conductivity of all elements and silver coatings can be used for electrical contacts. Additionally, due to its antibacterial properties, silver is a widely used material for various applications in the field of medicine. Nickel-chromium coatings offer resistance to oxidation as well as stability at high temperatures and are used as electrical heating elements. Due to the high material costs of some of these materials, for example silver, there is a need for thin, functional and cost-efficient coatings. A possibility to close the gap regarding coating thickness between classical thermal spray technologies and thin film technologies is the High Velocity Suspension Flame Spraying (HVSFS). Not only allows the HVSFS for the processing of submicron- and nanoscale particles as suspensions, it also offers the possibility for the spraying of liquid precursors by High Velocity Liquid Precursor Flame Spraying (HVLPFS). As a result, thin coatings between 10 and 50 µm are achievable. The scope of this study is the production of suspensions of the aforementioned materials, suitable for the HVSFS process in regard to their stability and rheological properties. The influence of the process parameters on the resulting coatings is investigated. Microstructure and phase composition of the different coatings are evaluated in order to establish a suitable processing window for each of the respective materials.

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