Wetting and erosive behavior of VC-TiC + CuNi-Cr based coatings developed by HVOF: Role of laser texturing

Laser texturing method was used in the current study to create a micro-textured surface over SS316 steel with HVOF (High Velocity Oxy-fuel) sprayed VC-TiC and CuNi-Cr based coatings. The static contact angle, cross-sectional characterization, hardness, EDS mapping, surface roughness, porosity percentage, XRD analysis, bond strength and slurry erosion resistance of textured and non-textured surfaces were measured. Slurry erosion experiments were carried out in accordance with ASTM G-73 standards. According to the findings, laser texturing was found as an effective technique for increasing the static contact angle of the surfaces, which in turn increases the slurry erosion resistance of the surfaces. SEM images were used to analyze the failure mechanism, and it was discovered that hard surfaces experienced a brittle mode of failure, whereas soft surfaces experienced a ductile mode of failure.