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Processing of a low-cost γ–γ′ NiPtAl coating with improved oxidation resistance

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Abstract

A novel γ–γ′ (Ni solid solution—Ni3Al) NiPtAl coating was produced on advanced single-crystal (SC) superalloy N5 by electroplating of a thin Pt coating with ~ 3 μm in thickness followed by heat treatment at 1000 °C in vacuum. For comparison, a traditional γ–γ′ NiPtAl coating was also produced by electroplating of a thick Pt coating with ~ 6 μm in thickness followed by heat treatment at 1100 °C in vacuum. The novel coating has a mass gain of ~ 0.5 mg·cm−2 after 100 h 1-h cyclic oxidation at 1150 °C, showing better oxidation resistance than the traditional coating. An oxide scale mostly consisting of α-Al2O3 grew on the novel coating because the element Cr from the SC alloy substrate contributes to the formation of α-Al2O3. Pt content in the novel coating has significant effect on the oxidation resistance. The optimized Pt content in the coating is about 16 at%, which is helpful to reduce the diffusion of harmful elements from the substrate into the coating but also to reduce the cost of the coating.

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Acknowledgements

This research was financially sponsored by the National Natural Science Foundations of China (Nos. 51590894, 51425102, 51231001) and China Postdoctoral Science Foundation (No. 2017T100023).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Yan Jiang, Liang-Liang Wei, Jian He & Hong-Bo Guo

  2. Key Laboratory of High-Temperature Structural Materials and Protective Coatings, Ministry of Industry and Information Technology, Beihang University, Beijing, 100191, China

    Yan Jiang, Liang-Liang Wei, Jian He & Hong-Bo Guo

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  1. Yan Jiang
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  2. Liang-Liang Wei
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Correspondence to Hong-Bo Guo.

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Jiang, Y., Wei, LL., He, J. et al. Processing of a low-cost γ–γ′ NiPtAl coating with improved oxidation resistance. Rare Met. 43, 2832–2841 (2024). https://doi.org/10.1007/s12598-018-1139-2

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  • DOI: https://doi.org/10.1007/s12598-018-1139-2

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