Journal
SURFACE ENGINEERING
Volume 28, Issue 4, Pages 266-272Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743294411Y.0000000024
Keywords
HVOF; MCrAlY coatings; Microstructure; Microhardness; Bond strength
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In the present study, NiCrAlY coatings were applied on steel substrate using high velocity oxygen fuel spraying process. The spray parameters were varied in order to study their influence on the coating properties. Powder and coating microstructures were investigated by a combination of X-ray diffraction, optical and scanning electron microscopy as well as energy dispersive spectroscopy analysis. Bond strength and microhardness tests were also performed on the coatings. It was found that the propane flowrate, the oxygen flowrate, the spray distance and powder feedrate have a significant effect on the coating characteristics. Finally, with the aim of minimising oxygen content and maximising bond strength, the optimum parameters were selected as the preferred spray parameters.
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