High-temperature oxidation behaviour of refurbished (Ni,Pt)Al coating on Ni-based superalloy at 1100 °C

Zhang, Chun Yu; Ma, Zhuang; Dong, Shizhi; Xu, Mengmeng; Li, S.; Zhang, C.; Jiang, Chengyang; Zhang, Bao; Zhu, Shenglong; Wang, F.H.

doi:10.1016/j.corsci.2021.109521

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…However, the cost of replacing the whole key components is usually high because of their high preparation and processing costs, especially for the nickel-based single-crystal superalloy substrate [8]. Instead, removing degraded TBC and refurbishing new TBC on components of nickel-based singlecrystal superalloys to extend their service life is highly cost-effective and feasible [15].…”

Section: Introduction mentioning

confidence: 99%

Comparative study on microstructure evolution and failure mechanisms of ordinary and refurbished EB-PVD TBC under cyclic oxidation

Li¹,

Jin²,

Lü³

et al. 2023

Journal of Advanced Ceramics

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Refurbishment of thermal barrier coating (TBC) has become a valuable technique to prolong the service life of high-temperature components. This study investigates the effect of the refurbishment process (coating removal and recoating) on the microstructure evolution and physical properties of TBC, including oxidation characteristics, element diffusion behavior, and crack failure mechanisms. The results showed that a certain amount of interdiffusion zone (IDZ) with Cr-rich would be retained in DD6 superalloy substrate after coating removal. The microstructure of the refurbished specimens showed equiaxed β-NiAl phases, while the ordinary specimens have elongated grain shapes with a high aspect ratio. Moreover, mixed oxides in the refurbished TBC specimens were earlier observed during cyclic oxidation, with a greater thickness compared to ordinary TBC, due to the influence of BC layer phase sizes. The growth mechanism of thermally grown oxide (TGO-Al 2 O 3 layer) in the refurbished TBC specimens was also different, resulting from the different mechanisms of mixed oxides growth. Furthermore, under cyclic oxidation with water quenching at 1100 ℃, the cracks in the refurbished specimen tend to occur in the mixed oxides layer, while the cracks in the ordinary specimen occur in the top coat (TC) layer, attributing to the earlier and thicker mixed oxides layer formed in refurbished specimens.

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Section: Introduction mentioning

confidence: 99%

Comparative study on microstructure evolution and failure mechanisms of ordinary and refurbished EB-PVD TBC under cyclic oxidation

Li¹,

Jin²,

Lü³

et al. 2023

Journal of Advanced Ceramics

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“…Pt-modified aluminide coatings have been proved to be satisfactory because of its superiority of resisting both high temperature oxidation and hot corrosion for protecting SX superalloys [7,8]. Amazingly, the refurbished Pt-modified aluminide coating also exhibited superior isothermal and cyclic oxidation resistance at 1100 • C [9]. Several studies [10][11][12][13] have shown that the presence of Pt can promote uphill diffusion and selective oxidation of Al, improve the stability of alumina and decrease the oxidation rate.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior and Oxide Transformation of a Pt-Modified Aluminide Coating at Moderate High Temperature

Zhang³

et al. 2021

Crystals

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The oxidation performance of a single-phase Pt-modified aluminide coating was assessed in oxidation test at 980 °C in comparison with the single crystal superalloy. The results suggested that the Pt-modified aluminide coating exhibited superior oxidation resistance. During oxidation, the oxide scale formed on bare alloy changed constantly followed by the constitution of the multi-layer scale structure: An outer scale mainly consisted of Cr2O3 + NiCr2O4 + TiO2 with scarce protection, and an internal scale mainly consisted of Al2O3. The thickness of the outer oxide scale increased with time, where the scale became looser and more porous. Meanwhile, the internal scale was discontinuous. Oxygen and nitrogen inwardly diffused into substrate, forming Ta2O5 and TiN particles. In contrast to the complex constitution of oxide scale, a uniform and continuous Al2O3 scale formed on Pt-modified aluminide-coated samples after oxidation at 980 °C for 1500 h, which showed no spallation and cracking. Interestingly, θ-Al2O3 and α-Al2O3 phases remained after such a long oxidation time. It is the relatively lower temperature and the presence of Pt retarded θ-α transformation. The degradation rate from β-NiAl to γ′-Ni3Al was very slow in the coating. The various development of oxide scale on the coating and substrate was individually studied.

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Oxidation behavior of Pt modified CoNiCrAl medium-entropy alloy under water vapour at 1100 ℃

Ma,

Kong,

Huang

et al. 2024

Corrosion Science

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High-temperature oxidation behaviour of refurbished (Ni,Pt)Al coating on Ni-based superalloy at 1100 °C

Cited by 8 publications

References 36 publications

Comparative study on microstructure evolution and failure mechanisms of ordinary and refurbished EB-PVD TBC under cyclic oxidation

Comparative study on microstructure evolution and failure mechanisms of ordinary and refurbished EB-PVD TBC under cyclic oxidation

Oxidation Behavior and Oxide Transformation of a Pt-Modified Aluminide Coating at Moderate High Temperature

Oxidation behavior of Pt modified CoNiCrAl medium-entropy alloy under water vapour at 1100 ℃

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