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1555 |
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Tuesday, June 03, 2008, Room 08 9:10 AM Fe-based Materials 1 Due to the worldwide rise of material costs Fe-based materials are becoming more and more a suitable alternative to established hard phase coatings |
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Influence of spray parameters and nozzle geometry on microstructure and properties of HVOF sprayed FeCr-VC coatings |
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Stefan Schuberth* / Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany Bernhard Wielage / Chemnitz University of Technology, Institute for Composite Materials and Surface Technology, Germany Thomas Grund/ Chemnitz University of Technology, Institute for Composite Materials and Surface Technology, Germany Hanna Pokhmurska/ Chemnitz University of Technology, Institute for Composite Materials and Surface Technology, Germany |
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The thermal spray application of inert gas atomised iron based powders for combined wear and corrosion protection prospectively offers important economical advantages compared to the well-established cermet coatings due to their lower price. Recent studies revealed basic knowledge about the thermal spray processing of these materials. For protecting the substrate from corrosive media, coatings have to be dense and impermeable to fluids. Especially poor bonding, occurring between partially melted or unmelted spray particles, leads to open porosity. Hence a certain degree of melting of particles is required. The GTV K2 spray gun allows the use of different nozzles to vary process temperature and velocity in a wide range. This paper shows the influence of applicated nozzles and process conditions on coating structure and properties. Characterisation is done by means of optical microscopy, digital image analysis, SEM, XRD and microhardness measurements. Additionally, some results regarding wear and corrosion behaviour are given. |