Wear and Friction Analysis of Plasma Sprayed Cr3C2-NiCr Coating

Sliding wear has been recognized as the severe problem on hot forming tools. The degradation of the tool steels occurs through the synergistic effects of the thermal, chemical and mechanical conditions. To enhance the performance of the dies, the work was planned to develop and study the behaviour of thermal spray coatings on the surface of hot forming dies. Therefore, in the present work , the experimentation analysis of the sliding wear and friction of bare AISI H11 tool steel and the Plasma sprayed Cr₃C₂-NiCr coated tool steels was done. The analysis was performed on the Pin-on-disc tribometer at room temperature under dry conditions. The in-depth characterization of the as-sprayed and the worn samples was carried out by X-ray diffraction (XRD) analysis, Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS).  Friction coefficients and the wear rates were evaluated for both the uncoated and the coated specimens.