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        Microstructure Analysis of the Pack Cementation Aluminide Coatings Modified by CeO2 Addition

        Hamid Zahedi,Farhad Shahriari Nogorani,Mahdi Safari 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

        Minor additions of reactive elements (Y, Ce, Hf, etc.) can improve the oxidation behavior of high temperature alloys andcoatings such as aluminide coatings. In the current investigation cerium-modified aluminide coatings were developed viaadditions of CeO2to the powder mixture of high activity pack cementation aluminizing. Nickel-based substrates were aluminizedat 750 °C and then diffusion annealed at 1080 °C. Microstructure of the coatings was studied using scanning electronmicroscopy, energy dispersive spectroscopy and X-ray diffraction. The results were compared with the characterization resultsof specimens achieved by aluminizing an electrodeposited Ni–CeO2 interlayer at 1030 °C. The coatings modified by CeO2addition to the pack showed a dense Al-rich NiAl surface layer with cerium distributed in the coating, however, the coatingsmodified by Ni–CeO2 interlayer revealed a porous Ni-rich aluminide layer containing CeO2particles. Increasing the CeO2content of the pack decreased the thickness of the final coating, but the presence of CeO2particles in the interlayer increasedthe thickness of the final aluminide coating. The observed microstructural features were explained using thermodynamicanalysis of equilibrium concentration of the involved gaseous species.

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