Abstract
This work studies the effects that different percentages of WC reinforcement particles produce on the wear of a NiCrBSi coatings obtained by laser cladding. The density of the WC particles, which is higher than those of the matrix, makes it necessary to control the volume provided from each material to maintain the height of the coating. In addition, said difference of density promotes the precipitation of the WC particles inside the Ni matrix, causing a non-homogeneous distribution of the particles in the cross section of the coating. Unlike other studies in which the adjusted concentration of WC in the feeder is considered (wt% WCfeeder concentration), this work studies the dry wear behavior of coatings, using a ball-on-disk configuration tests, as a function of the actual WC% by weight present on the surface tested for wear (wt% WCactual concentration), this being determined by image processing software. Wear decreases exponentially with the increase in WC concentration, to a limit of 27 wt% WCactual. At this limit, an increase in reinforcement particles does not generate a significant decrease in wear. The predominant wear mechanism varies depending on the wt% WCactual, passing from the adhesive and oxidative types to abrasive when WC percentage increases.
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Acknowledgments
The authors wish to express their thanks to the Ministry of Science and Innovation, Spain, for supporting this work within the framework of the research project “Design and manufacturing of laser cladding functionally graded coatings with predefined tribological behaviors—DESCARTA” (DPI2010-15285). The authors also thank to Ministry of Economy and Competitiveness, Spain and Foundation for the Promotion in Asturias of the Applied Scientific Research and Technology (FICYT) for supporting the research project STARLUBE (DPI2013-48348-C2-1-R) and GRUPIN14-023 respectively.
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García, A., Fernández, M.R., Cuetos, J.M. et al. Study of the Sliding Wear and Friction Behavior of WC + NiCrBSi Laser Cladding Coatings as a Function of Actual Concentration of WC Reinforcement Particles in Ball-on-Disk Test. Tribol Lett 63, 41 (2016). https://doi.org/10.1007/s11249-016-0734-3
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DOI: https://doi.org/10.1007/s11249-016-0734-3