Effects of Cr on Microstructure and Hardness of HVOF-Sprayed WC-Co Coating

Abstract:

In the areas of remanufacturing and working conditions with requirements of wear and corrosion resistance, the WC-Co thermal spray coating has a wide applications. WC-10Co-4Cr is an excellent, has great application potential as a coating composition. In this research, the two kinds of coatings, WC-12Co and WC-10Co-4Cr, were sprayed by high velocity oxygen-flame(HVOF). The phase composition is studied by X-ray diffraction(XRD). The porosity is investigated by lase confocal scanning microscope(LCSM), and the micro-hardness is measured. The results show that, The porosity of two coatings don't differ, this maybe has relation with the parameters in the spraying process.The micro-hardness of WC-10Co-4Cr coating is higher than that of WC-12Co coating. Compared with the phase composition of WC-12Co coating, there are new phase composition Cr7C3, Cr23C6 and Cr2WO6 in the WC-10Co-4Cr coating. And the content of W2C and η phase are reduced in WC-10Co-4Cr coating. Cr had no effect on the lattice transformation of cobalt.

• Periodical: Advanced Materials Research (Volumes 317-319)
• Pages: 301-306
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.317-319.301
• Online since: August 2011
• Authors: Li Jun Wang, Hui Chen, Yan Liu, Guo Qing Gou, Da Li
• Keywords: Microhardness, Porosity, WC-10Co-4Cr Coating, WC-12Co Coating, X-Ray Diffraction (XRD)

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