Microstructure and Properties of Fe/Al2O3 Gradient Coatings on Steel Substrate
The composites of Fe/Al2O3 gradient coatings on steel substrate were prepared by spraying and sol-gel method, and the microstructure and performances of the composites were analyzed. The results show that the adhesion strength of Fe/Al2O3 gradient coatings with FeAlNi transitional layers reaches 25.3MPa when the sintering temperature is 1220°C, and the surface hardness of coatings is four times higher than that of steel substrate. The coatings are mainly composed of α-Al2O3, AlFeO3 and NiFe2O4. There is no obvious hole or macro-interface, while some organization similar to the branch appears in the coatings. The bonding of Fe/Al2O3 gradient coatings and steel substrate mainly depends on adsorption, diffusion and chemical combination.
Jinglong Bu, Zhengyi Jiang and Sihai Jiao
J. F. Liu et al., "Microstructure and Properties of Fe/Al2O3 Gradient Coatings on Steel Substrate", Advanced Materials Research, Vols. 150-151, pp. 1325-1329, 2011