Effects of Powder Characteristics and High Velocity Flame Spray Processes on Hardmetal Coatings: Part 1 — Cr3C2-NiCr-Coatings

Wednesday, May 13, 2015: 3:30 PM
Room 101B (Long Beach Convention and Entertainment Center)
Mr. Richard Trache , Technische Universität Dresden, Dresden, Germany
Dr. Lutz-Michael Berger , Fraunhofer IKTS, Dresden, Germany
Mr. Sven Thiele , Fraunhofer IKTS, Dresden, Germany
Dr. Filofteia-Laura Toma , Fraunhofer IWS, Dresden, Germany
Prof. Alexander Michaelis , Fraunhofer IKTS, Dresden, Germany
Prof. Christoph Leyens , Technische Universität Dresden, Dresden, Germany
Wear protection is a major application in thermal spray industry. Currently, Cr3C2-based hardmetal coatings with metallic binders of Co, Ni or NiCr are used for this including high-temperature performance. These materials are applied by high velocity flame spraying processes like HVOF and HVAF using liquid and gaseous fuel. However, these applications still face both economic and technical challenges, e.g. improving coating performance and increasing deposition efficiency.

This paper presents the latest results of a systematic study on the influence of Cr3C2-NiCr feedstock powder characteristics on the deposition efficiency and coating microstructures. Four commercial Cr3C2-NiCr powders with different microstructural features were characterised and sprayed with a liquid-fuelled and a gas-fuelled HVOF and a HVAF process. Coatings were analysed as-sprayed and heat-treated in argon at 800 °C. 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.

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See more of: Thermal Spray Applications