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Studies on the erosion resistant HVOF Ni-Cr-Cr3C2 coatings for boiler tubes
By A. Shyamsundar Reddy, K. Asokkumar, and P. Bala Srinivasan
Boiler steels, coatings, microstructure, erosion resistance
The applicability of NiCr-Cr3C2 coating by high-velocity-oxy-fuel (HVOF) thermal spray technique for imparting the elevated temperature erosive wear resistance to 1Cr-0.5Mo boiler grade steel was attempted in this work. It was observed that deposits to the thickness level of about 300 m could be built on these substrates by HVOF, with acceptable bond strength and quality. The elevated temperature erosive wear tests performed at 420 °C with bed-ash particles as erodent revealed that this NiCr-Cr3C2 HVOF coating can offer excellent resistance to erosion and shall provide the protection to the boiler tubes from degradation/failures.
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