Singh J, Gill R, Kumar S, Mohapatra S. Comparative Analysis on Reinforcement of Potential Additives in WOKA
Cermet HVOF Coating Subjected to Slurry Erosion in Ash Conditions. IJMSE 2022; 19 (4) :1-12
URL:
http://ijmse.iust.ac.ir/article-1-2834-en.html
Abstract: (7646 Views)
In this paper, an investigation was carried out to test the suitability of potential additive materials in
WOKA 3533 (WC-10Co4Cr) cermet HVOF coating subjected to slurry erosion in ash conditions. The additives
namely molybdenum carbide, yttrium oxide, and zirconium oxide were added in equal percentages (3 wt.%) in
WOKA cermet powder. High-velocity oxy-fuel (HVOF) spraying was performed to develop the additive-based
WOKA cermet coatings. The slurry erosion in ash conditions was tested using the pot tester. Microstructural and
mechanical properties of traditional and additive-based WOKA cermet coatings were also tested in the present
study; for example, microstructure, crystalline phases of as-sprayed coatings, and microhardness. Results present a
comparison of surface erosion wear of different cermet coatings. It was found that the yttrium oxide was a suitable
additive for the WOKA cermet coatings than the molybdenum carbide. However, zirconium oxide is unsuitable for
WOKA cermet coatings in erosion wear applications.
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Highlights
- The slurry erosion resistance order for the variation of concentration, time, and speed of rotation is found as WOKA-Y > WOKA-M > WOKA > WOKA-Z.
- Increment in slurry erosion was lower in the case of FA particles as compared to BA particles.
- Maximum slurry erosion for FA and BA slurry was perceived at 60º impact angle for standard and modified WOKA coatings.
- The characteristic of slurry erosion specifies that standard and modified WOKA coatings show brittle mode of failure.