Abstract
The present study is based on erosion wear analysis of WC-Co-Cr powder thermally sprayed on super-duplex stainless steel (SDSS) 2507. A high-velocity oxy-fuel (HVOF) process was used to deposit the WC-Co-Cr thermal spraying powder. A small weight proportion of Mo2C, Y2O3 and ZrO2 feedstock powders was mechanically blended to WC-Co-Cr thermal spraying powder for analyze the improvement in erosion wear. Erosion wear experiments were conducted using a slurry pot tester at a rotational speed of 600–1500 rev/min for time duration of 90–180 min. Sand was used as the erodent medium; the concentration of solid particles was varied from 30% to 60% (by weight). Present study was extended to analyze the mechanical properties of coatings. Results show that the 3% addition of feedstock powders was beneficial to improve the erosion wear resistance of SDSS-2507. The addition of Y2O3 and Mo2C had improved the erosion wear performance of WC-Co-Cr coating. The addition of Y2O3 provided high erosion wear as compared to Mo2C addition. The addition of ZrO2 was helpful to significantly improve the corrosion resistance of WC-Co-Cr coating whereas it decreases the erosion wear resistance of coating.
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