In this investigation, spherical Cr7C3-(Ni,Cr)3(Al,Cr) powder with different compositions was prepared by vacuum melting and gas atomization. During the solidification process, Cr7C3 is in-situ synthesized and uniformly distributed in the Cr-doped Ni3Al phase. Coatings produced from the powders by HVOF spraying were characterized based on composition, microstructure, hardness, and tribological properties. The results show that the coatings compare well with commercial Cr3C2-NiCr coatings used on piston rings in heavy duty diesel engines. Optimization routes for further improvement are also discussed.

alloy powder, chromium carbide cermet coatings, high-velocity oxyfuel spraying, in-situ powder synthesis, microhardness, microstructure
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2016
DVS Media GmbH
Topics
Microstructure High-velocity oxyfuel spray coating Gas atomization Friction and wear properties Microhardness Chromium carbide cermets
Issue Section:
Poster Session: Wear Protection
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