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3884 |
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Influence of the cored wire design on the microstructure and properties of arc sprayed Fe-based coatings |
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Hanna Pokhmurska* / Institute of Material Science and Engineering, Chemnitz University of Technology
, Germany Stefan Schuberth/ Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany Christian Rupprecht/ Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany Thomas Lampke/ Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany Bernhard Wielage/ Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany |
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Arc spraying is widely used in many branches of the industry, in particular for wear and corrosion protection. The development of cored wires expands the range of sprayable materials significantly compared to solid wires. The application of cored wires with larger diameter allows increasing their filling coefficient (i.e. 20 and 50 vol.-% for wires with diameter 1.6 and 3,2 mm, respectively). Hence the extension of the chemical compositions is possible. An application of thick cored wires with hard particle filling for the deposition of wear resistant coatings could be especially attractive. Nevertheless, their handling is more complicated due to the higher stiffness. Besides that, higher currents and gas flows are required. This strongly influences the stability of the arc as well as the particle flow and therefore also the coating characteristics. The paper presents results regarding the properties of coatings arc-sprayed from Fe-base cored wires of 1.6, 2.4 and 3.2 mm diameter. Microstructure of coatings and their porosity, microhardness and oxidation grad as well as deposition efficiency have been investigated. The correlation of coating properties and characteristics of the coating-forming particles is discussed. |