Influence of WC/Co Concentration on Structure and Mechanical Properties of the Thermally Sprayed WC/Co-NiCrBSi Coatings

Abstract

In this study the influence of WC/Co concentration in thermally sprayed WC/Co-NiCrBSi coating on its properties was evaluated using different analytical methods. A number of coatings were deposited on steel substrates by flame spraying using powder with different WC/Co concentrations (0 %, 15 %, 20 %, 25 %, 30 %, 45 %). Those coatings were subsequently remelted at high temperature using flame torch. Microstructure of as-sprayed and remelted coatings was evaluated using optical microscope. XRD analysis as well as hardness testing and wear testing, were performed on the samples. Wear tracks were also analyzed to estimate the nature of the wear of the different coatings. Experimental results were compared to determine which coating shows the best quality in terms of the wear resistance.