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Abstract: A series of Fe–xCr cored wires (x =15, 20, 25, 30, 35 and 40% in weight) were used to produce protective coatings for components used in high-temperature environments by wire-arc spraying. The microstructure, morphology and high-temperature oxidation behavior of the Fe–xCr coatings were investigated. The Fe–xCr coatings presented a homogeneous structure with thin oxide inclusions and low porosity. Thermogravimetric analysis was used to evaluate the high-temperature oxidation behavior of the coatings at a temperature of 650°C under cyclic oxidation conditions. The results showed that all the Fe–xCr coatings exhibited significantly lower weight gain than the uncoated substrate. As Cr content of the coatings increased, the thickness of oxide scales decreased and oxidation resistance improved. [Copyright &y& Elsevier]

Abstract In this study, an Al 0.6 TiCrFeCoNi high entropy alloy coating was produced by high-velocity-oxygen-fuel spraying. The microstructure and phase composition of the coating were investigated, moreover the hardness and the fracture toughness of the coating were determined. The wear behavior of the coating at different temperatures was evaluated using a pin-on-disc test. The results show that the coating was very dense and consisted of lamellae. Two BCC phases with similar lattice parameters were detected in the as-sprayed coating. The wear of the coating against an Al 2 O 3 counter body was mainly caused by abrasion at all temperatures. The role of fatigue wear increased with increasing test temperature. In addition, tribo-reaction played an important role at the test temperature of T = 500 °C, which led to the lowest friction coefficient of the coating under the given test conditions. Highlights • The wear behavior of Al 0.6 TiCrFeCoNi HVOF coating was investigated at room temperature, T=300°C and T=500°C in detail. • The wear behavior of the coating changed significantly with the increasing test temperatures. • The wear behavior of the coating changed significantly with the increasing test temperatures. • The wear mechanism changed with temperatures, tribo-reaction played an important role at test temperature of T=500°C. [ABSTRACT FROM AUTHOR]