Structure and properties of HVOF-sprayed and PTA-welded cermet hard phase reinforced Fe-matrix-based coatings

摘要

The aim of this study is to elaborate new composite coatings based on the hardmetal/cermet hard pahase - metallic-iron-based matrix for the heavy abrasive wear conditions. WC-based hardmetal and Cr-based cermet powders, produced by disintegrator milling, were used. Commercial Cr-Ni-steel and FeCrSiB alloy powders were used as matrix materials. Optimal content of hard phase (40 vol.%) was selected. For deposition of coatings, high-velocity oxy-fuel (HVOF) spraying and plasma transferred arc (PTA) hardfacing were used. Three different wear testing methods namely abrasive rubber wheel wear (ARWW), abrasive erosive wear (AEW) and abrasive impact wear (AIW) were studied. Wear rates and relative wear resistance values were determined. As a result, the advantages of experimental composite coatings in comparison with commercial powder-based coatings were demonstrated.