Erosion Studies of WC-Co-Cr Mixed TiC Powder Sprayed by HVOF Process on 16/5 Martensitic Stainless Steel

Abstract

WC-Co-Cr powder was mixed with 5 % micron sized TiC powder to form blended powder. The blended powder was deposited on 16/5 martensitic stainless steel (16/5 MSS) by high velocity oxy fuel process. The microhardness of the blended coating, WC-Co-Cr and 16/5 MSS was found to be 1271, 1081 and 337 VHN respectively. The coated specimen and 16/5 specimen were examined for slurry erosion test for 48h. The weight loss of the coated and coated specimen was measured after every 6h. WC-Co-Cr coating has the maximum erosion resistance behavior followed by blended coating and 16/5 MSS. The volume loss of modified coating due to erosion was found to be 65% less in comparison to 16/5 MSS. The enhanced erosion resistance of the blended coating is attributed to higher hardness of the coating w.r.t 16/5 MSS.