Abstract
HVOF sprayed WC-CoCr coatings are used to in wear and corrosion applications. Commercially available hard metal powders for HVOF spraying are normally manufactured from virgin raw materials. In the present work, the possibility to manufacture WC-CoCr spray powder with excellent properties and quality from recycled cemented carbide tools and tool bits was studied. The powders were manufactured from hard metal scrap by a series of processing steps. The powders were sprayed by using the HVOF process. The properties of the powders and coatings were studied and compared to those of commercially available state-of-the-art WC-CoCr powders and coatings with the same nominal composition. Experimental powders worked well during spraying and the quality of the coatings was equal or even better than that of the reference coatings. Equal or even better corrosion properties compared to reference coatings were obtained with the new spray powder manufactured from recycled hard metal.
