Cobalt-based PTA coatings, effects of addition of TiC nanoparticles

The novel filler metals of cobalt-based alloys reinforced with titanium carbide nanoparticles (TiC-NPs) were used for the fabrication of plasma transferred arc hardfacing coatings. The effect of tribological behavior for TiC-NPs addition on two Co-based filler metals (Stellite 6 and Stellite 12), as well as the dilutions, was studied. Mixtures of Co-based filler metals without and with 0.5% and 2% TiC-NPs were deposited onto D2 steel plates. Stellite 12 had an increase in the dilutions (70%) and enthalpies due to a major surface energy and endothermic reactions. The results of DSC (Differential Scanning Calorimeter) in the filler metals with TiC-NPs showed a shell of nanowhiskers on the sintered surface, which were observed and chemically analyzed via SEM (Scanning Electron Microscope) and EDS (Energy Dispersive Spectroscopy). Stellite 6 with 2% TiC-NPs was the most effective in increasing the wear resistance. These outcomes might be of interest for mining industries, where machinery and equipment are exposed to extreme wear conditions.