Investigation of HVOF Thermal Sprayed Cr3C2-NiCr Cermet Carbide Coatings on Erosive Performance of AISI 316 Molybdenum steel

The objective of the work was to determine the effect of Cr3C2-NiCr coatings on erosive performance of AISI 316 molybdenum steel using Air Jet Erosion Tester. The coating of high velocity oxygen fuel (HVOF) thermal sprayed consisted of determining the differences in the composition mechanism. The coated samples were characterised by micro Vickers hardness and XRD. Erosion test were conducted with alumina particle of size 22-24 μm at temperature of 650 ̊C at impact angles 60̊, 75̊ and 90̊. The surface morphology of eroded higher impact angle (75̊) specimen was examined by scanning electron microscopy (SEM). On the basis of microstructural and experimental results of the particle mass effect on the compared three compositions smaller weight losses and erosion rates under all the selected working conditions, which account for their higher erosion resistances.