Abstract No.:

Influence of Cr3C2-NiCr feedstock powder characteristics on the deposition efficiency, coating microstructures and abrasion wear resistance

Lutz-Michael Berger* / Fraunhofer Institute for Material and Beam Technology, Germany
Tim Börner / Fraunhofer IWS, Germany
Sven Thiele/ Fraunhofer IKTS, Germany
Leo Janka/ AC2T Research, Austria
Manel Rodriguez Ripoll/ AC2T Research, Austria

Among the thermal spray coating solutions wear protection is one of the dominating applications. For this purpose, including high temperature applications, hardmetal coatings based on WC and Cr3C2 with metallic binders (Co, Ni or NiCr) are widely applied. According to the state-of-the-art, these coatings are deposited by high velocity flame spraying processes (HVOF/HVAF). There both technical (improving coating performance) and economical challenges (lower the coating costs, e.g. by increasing the deposition efficiency (DE)) which have to be solved for future applications. There are also so far no established links between feedstock powder properties, thermal spray process and resulting tribological properties.
In this contribution first results of a systematic study on the influence of Cr3C2-NiCr feedstock powder characteristics on the deposition efficiency and coating microstructures. Several commercial Cr3C2-NiCr feedstock powders with different microstructural features were characterised and sprayed with a liquid-fueled HVOF process. The deposition efficiency of different spray parameters was linked with the coating microstructure, hardness and Youngs modulus. The abrasion wear resistance was studied using rubber and steel wheel.

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