The Microstructure and Erosion Wear Performance of HVOF-Sprayed Cr3C2-NiCr Coatings with Different Feedstock Powder

In the present study, Cr3C2-NiCr coatings have been deposited using high velocity oxy-fuel (HVOF) system from two commercially available powders with different NiCr contents (25 and 40 wt.%) and manufactured by different process (the blended and agglomerated-sintered). Coating microstructures were studied by scan electron microscopy (SEM). Hardness, erosive wear performance of the two coatings was measurement. The influence of powder characteristics on the microstructure and erosive performance of Cr3C2-NiCr coatings was investigated. The erosion mechanism of Cr3C2-NiCr coatings was examined through the surface morphology of the eroded coatings. The results indicated that Cr3C2-NiCr coating hardness decreased from 822 to 702 Hv with increasing NiCr content from 25 wt.% to 40 wt.%, however, Cr3C2-40NiCr coating exhibits better erosive wear resistance in comparison to Cr3C2-25NiCr coating.