Title: Development of thermal spray powders for improved tribological and corrosive applications and cost-effective solutions

Authors: Ulla Kanerva, Juha Lagerbom, Petri Vuoristo

Addresses: Institute of Materials Science, Tampere University of Technology, P.O. Box 589, FIN-33101 Tampere, Finland. ' Institute of Materials Science, Tampere University of Technology, P.O. Box 589, FIN-33101 Tampere, Finland. ' Institute of Materials Science, Tampere University of Technology, P.O. Box 589, FIN-33101 Tampere, Finland

Abstract: HVOF sprayed carbide/metal coatings are used widely to prevent wear and corrosion of engineering components. However, in some specific applications additional properties, such as low friction surfaces with good sliding properties and/or more improved corrosion resistances with simultaneous high wear resistance are required. Often such properties are not obtained by using conventional commercial spray powder compositions. The cost of the spray powders and sprayed coating plays very often also an important role. Therefore, cost-effective solutions are also needed. The aim of the present work is to describe the development of special hard metal powders with tailored powder compositions and structures. Experimental Cr₃C₂-25Ni + 10vol-% solid lubricant powders, WC-15% corrosion resistant metal binder powders, and WC-10Co-4Cr powder manufactured from recycled hard metal scrap were prepared by using the spray drying and sintering process. The powders were sprayed by High-Velocity Oxy-Fuel (HVOF) spray process. The microstructures of the developed powders and coatings are reported.

Keywords: HVOF spraying; powder manufacturing; hard metal coatings; multi component coatings; solid lubricants; recycled hard metals; high velocity oxy fuel; thermal spray powders; tribology; corrosion; metal powders; spray drying; sintering.

DOI: 10.1504/IJMPT.2007.013086

International Journal of Materials and Product Technology, 2007 Vol.28 No.3/4, pp.377 - 398

Published online: 07 Apr 2007 *

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