Wear and high temperature oxidation behaviour of wire arc sprayed iron based coatings

Abstract

In the present work, FeCrB(CSi) cored wires (C17, C21 and C25) were designed and deposited as coatings by wire arc spraying. The microstructure, microhardness, wear and high temperature corrosion behaviour of the new coatings were investigated in comparison with a commercial Fe–Cr–Al coating. The FeCrB(CSi) coatings presented lamellar microstructures with some pores and microcracks and a few oxide inclusions. The microhardness of the coatings is much harder than those of the substrate and the commercial Fe–Cr–Al coating. The wear resistance of the coatings is much better than that of the uncoated substrate. Thermogravimetric analysis was used to evaluate the high temperature oxidation behaviour of the coatings at a temperature of 650°C under cyclic oxidation conditions. The results show that the high temperature oxidation resistance of the C17 coating was not as good as the Fe–Cr–Al coating, while the C21 and C25 coatings exhibited better oxidation resistance than the FeCrAl coating.

Keywords:

• FeCrB(CSi) coating
• Wire arc spraying
• Microstructure
• Wear
• High temperature oxidation

Acknowledgements

The authors would like to acknowledge the financial support from Beijing Natural Science Foundation (2142010).