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High-Temperature Oxidation Behavior of a Silico-Aluminized MCrAlY Coating on a Ni-Based Superalloy

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Abstract

In this research, silico-aluminide diffusion coating was applied on a conventional NiCoCrAlY coating that was deposited on Hastelloy-X superalloy via the high-velocity oxy-fuel (HVOF) thermal spraying technique. The slurry method was utilized as the diffusion coating method. Diffusion heat treatment was carried out at 1050 °C. High-temperature oxidation behavior of NiCoCrAlY/silico-aluminide coated samples was studied at 1000 °C and compared with those of conventional NiCoCrAlY coatings. The coatings were explored using X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis before and after oxidation testing. Both coatings followed parabolic kinetics. The silico-aluminide overlay coating outperformed the NiCoCrAlY coating with respective parabolic rate constants of 0.0958 and 0.1702 μm2/h. After 150 h of oxidation, the silico-aluminized overlay coating maintained a single layer of alumina, while a double-layered oxide consisting of spinel and aluminum oxide was observed in the case of conventional NiCoCrAlY coating, reflecting higher stability of the NiCoCrAlY/silico-aluminized coating.

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taken from the outer layer of the diffusion coating (20–30 μm from the surface) to determine the distribution of precipitates in the matrix (Fig. 13). It seems that a similar mechanism occurred in sample C as well. This also proves the existence of silicide precipitates in the aluminide matrix

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Authors and Affiliations

  1. Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran

    E. Hatami & S. M. M. Hadavi

  2. Department of Ceramic, Materials and Energy Research Center, Karaj, Iran

    D. Salehi Doolabi

  3. Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

    M. Bahamirian

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  1. E. Hatami
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  2. S. M. M. Hadavi
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  3. D. Salehi Doolabi
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  4. M. Bahamirian
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Correspondence to M. Bahamirian.

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Hatami, E., Hadavi, S.M.M., Salehi Doolabi, D. et al. High-Temperature Oxidation Behavior of a Silico-Aluminized MCrAlY Coating on a Ni-Based Superalloy. Oxid Met 97, 575–597 (2022). https://doi.org/10.1007/s11085-022-10109-3

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  • DOI: https://doi.org/10.1007/s11085-022-10109-3

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