Performance of thermal spray coatings under dry abrasive wear conditions
The performance under dry abrasive wear conditions is studied for HVOF sprayed cermet coatings in comparison to APS Cr2O3 and cermet as well as electroplated hard chromium coatings in Taber Abraser tests. Investigations on the wear behavior depending on the use of different abrasive wheels as well as on the influence of hard phase size, microhardness and chemical composition of the metallic matrix alloy in HVOF sprayed cermet coatings are carried out. In general cermet coatings show superior wear resistance compared to APS Cr2O3 and electroplated hard chromium coatings in Taber Abraser tests with H-22 abrasive wheels. The chemical composition of the metallic matrix of HVOF cermet coatings proves to be decisive concerning optimized wear resistance. The size of hard phases shows only minor influence. Coatings produced with coarse carbides make the highest wear resistance accessible, but the wear behavior depends much more severely on an optimized processing compared to coatings with fine carbides.
A. Wank, B. Wielage, G. Reisel, T. Grund, E. Friesen
Institute of Composite Materials, Chemnitz University of Technology, GERMANY