Particulate Science and Technology, Vol.38, No.1, 34-44, 2020
Erosion tribo performance of HVOF deposited WC-10Co-4Cr and WC-10Co-4Cr+2%Y2O3 micron layers on pump impeller steel
SS 410 is widely used as pump impeller material due to its high erosion resistance property. On the other hand, the microhardness of SS 410 is comparatively lower than other steels. So in this paper, WC-10Co-4Cr and WC-10Co-4Cr + 2%Y2O3 (yttrium oxide) powders are used to improve the microhardness of SS 410. The erosion due to fly ash slurry mixture has been inspected in a slurry pot analyzer. The erosion wear experiments were performed for equisized slurry of different particle size range, namely <53 mu m, 53-106 mu m, 106-150 mu m, and 150-250 mu m. During the experimentation, concentration of fly ash slurry was varied from 35 to 65%. The rotation speed of pot tester was taken as 750, 1000, 1250 and 1500 rpm. Experiments were repeated for different time durations like 75, 120, 165 and 210 min. A high velocity oxygen fuel coating technique was utilized to deposit the coating powders on the pump impeller materials SS 410. WC-10Co-4Cr sprayed SS 410 was found to have better erosion wear resistance as compared to bare SS 410. The addition of 2% Y2O3 in WC-10Co-4Cr has enhanced the erosion wear resistance based on change in hardness from 1130 HV to 1190 HV and because of the densification impact of Y2O3.