Several different HVOF thermally sprayed coatings were determined to find out their abrasion wear resistance and mechanisms with respect to their mechanical properties and microstructure. Two types of cermets, WC-17%Co, Cr3C2-25%NiCr and NiCrBSi and 316L coatings were examined. The aim of this work was to investigate the influence of coating microstructure on abrasive wear behavior and also with regarding their fracture toughness measured by nanoindentation fracture toughness (IFT) method. In

more »

... se of thermally sprayed coatings evaluation it is necessary to take into account their unique lamellar microstructure and other characteristics such as hardness, Young modulus of elasticity or fracture toughness, porosity, cohesive strength, oxide content etc. The abrasive wear performance of the coatings was assessed using a dry/sand rubber wheel test according to ASTM G-65, wet slurry abrasion test according to ASTM G-75 and pin-on-disc test according to ASTM G-99. In all cases alumina was used as an abrasive medium. Wear mechanisms were assessed by SEM examination of the wear surfaces in the middle of the wear trace and understood in terms of the different coating microstructures.