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Effects of powder characteristics and high velocity flame spray processes on Cr3C2-NiCr-coatings

: Trache, Richard; Toma, Filofteia-Laura; Leyens, Christoph; Berger, Lutz-Michael; Thiele, Sven; Michaelis, Alexander

McDonald, A. (eds.) ; ASM International; The Thermal Spray Society -TSS-:
Thermal spray 2015. International Thermal Spray Conference ITSC 2015. Proceedings : Innovative Coating Solutions for the Global Economy; Long Beach, California, May 11 - 14, 2015
Materials Park, Ohio: ASM International, 2015
International Thermal Spray Conference & Exposition (ITSC) <2015, Long Beach/Calif.>
Bundesministerium für Bildung und Forschung BMBF
Development of economically efficient thermally sprayed hardmetal coating solutions for high temperature applications
Fraunhofer IWS ()
Fraunhofer IKTS ()
thermal spray coatings; HVOF; hardmetal coatings; feedstock powders; coating properties; Cr3C2-NiCr

Wear protection is one of the major applications of thermally sprayed hard metal coatings. This paper presents the latest results of a systematic study on the influence of Cr3C2-NiCr feedstock powder characteristics on coating microstructures and economic parameters like deposition rate and deposition efficiency. Four commercial Cr3C2-NiCr powders with spherically shaped particles but different structural features were characterized and deposited by a liquid-fueled and a gas fueled HVOF and a HVAF process. Deposition rates and efficiencies were determined; all coatings were analyzed in as-sprayed condition and selected samples were heat-treated at 800 °C in argon atmosphere. The effects of the feedstock powders and spray processes on the coating characteristics (microstructure, hardness, Young’s modulus and diffusion processes during heat treatment) were studied.