Influence of Spraying Powers on Surface Free Energy and Tribological Properties of NiCr-Cr3C2 Coating

doi:10.3901/JME.2015.23.096

Abstract

Abstract: The NiCr-Cr3C2 coatings are prepared by the supersonic plasma spraying under different spraying powers and the tribological properties are studied with surface free energy theory. By measuring the contact angles of the coating, the surface free energy and its components are calculated by the Owens-Wendt geometric mean method. By comparing the analysis, it finds that the porosity, micro-hardness and friction coefficient of the coating change as the spraying power, and the trend shows a certain similarity with the polar component. The analysis result indicates that the intermolecular force of surface is affected by the temperature and velocity of the flying particles under different spraying power. That indirectly changes the surface free energy and its components. When the change happened, the tribological properties of NiCr-Cr3C2 coating will be affected directly.

Key words: NiCr-Cr3C2 coatings, supersonic plasma spraying, surface free energy, tribological property

LI Nannan, KANG Jiajie, WANG Haidou, DONG Tianshun, XU Zhonglin, LI Guolu. Influence of Spraying Powers on Surface Free Energy and Tribological Properties of NiCr-Cr3C2 Coating[J]. Journal of Mechanical Engineering, 2015, 51(23): 96-102.

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