Abstract: The Fe-Al intermetallics coating was produced by cored wires and high velocity arc spraying (HVAS), and the microstructure and sliding wear behavior from room temperature up to 650 ℃ of the coating were investigated. The results show that the average chemical composition of the coating is Fe-20.0Al-14.1O (molar fraction, %). The microstructure is found to consist of Fe3Al, FeAl and α-Fe phases mainly, together with fine oxide (Al2O3) layers and a little Al. The results of sliding wear indicate that the Fe-Al coating exhibits low wear rate from room temperature to 650 ℃. The reason of the friction coefficient decreasing at elevated temperatures is that protective oxide film forms on the worn surface during sliding wear process. And delamination is the predominant wear mechanism of the coatings. Fe3Al and FeAl intermetallics which have higher strength and hardness at elevated temperatures can effectively resist crack initiation, propagation and fracture of splat particles, resulting in excellent high temperature wear resistance of the Fe-Al coating.
Fe-Al intermetallics coating produced by high velocity arc spraying
Abstract:
The Fe-Al intermetallics coating was produced by cored wires and high velocity arc spraying (HVAS) , and the microstructure and sliding wear behavior from room temperature up to 650 ℃ of the coating were investigated. The results show that the average chemical composition of the coating is Fe-20.0Al-14.1O (molar fraction, %) . The microstructure is found to consist of Fe3Al, FeAl and α-Fe phases mainly, together with fine oxide (Al2O3) layers and a little Al. The results of sliding wear indicate that the Fe-Al coating exhibits low wear rate from room temperature to 650 ℃. The reason of the friction coefficient decreasing at elevated temperatures is that protective oxide film forms on the worn surface during sliding wear process. And delamination is the predominant wear mechanism of the coatings. Fe3Al and FeAl intermetallics which have higher strength and hardness at elevated temperatures can effectively resist crack initiation, propagation and fracture of splat particles, resulting in excellent high temperature wear resistance of the Fe-Al coating.