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Performance of Bond Coats Modified by Platinum Group Metals for Applications in Thermal Barrier Coatings

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Abstract

We have investigated the partial replacement of Pt with other less expensive Pt group metals on the properties of γ′ + γ bond coats used in thermal barrier coatings (TBCs) deposited on a nickel-base superalloy. The microstructure, thermal stability, oxidation behavior and performance in TBC systems of bond coats synthesized with Pt + Ru, Pt + Ir and Pt + Rh are compared with those of a reference bond coat synthesized with Pt. Yttria-stabilized zirconia has been employed as top coat in all coating systems. It is shown that at high temperatures all bond coats are degraded by interdiffusion and oxidation, however, with different kinetics. The lifetime of each TBC system is found to be limited by the cohesion between the thermally grown oxide and underlying bond coat. Differences in the behavior of various bond coats are correlated with their properties. Among the three Pt group metals investigated, the properties of the Pt + Ru bond coat are shown to closely approach those of the Pt bond coat. It is concluded that Ru with much lower cost presents a potential candidate for reducing the consumption of Pt.

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Acknowledgments

The authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science and Technology Unit at King Fahd University of Petroleum and Minerals (KFUPM) for funding this work through Project No. 12-ADV2398-04 as part of the National Science, Technology and Innovation Plan.

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Authors and Affiliations

  1. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, KFUPM Box 1639, Dhahran, 31261, Saudi Arabia

    H. M. Tawancy & Luai M. Alhems

  2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA

    M. O. Aboelfotoh

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  1. H. M. Tawancy
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Correspondence to H. M. Tawancy.

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Tawancy, H.M., Alhems, L.M. & Aboelfotoh, M.O. Performance of Bond Coats Modified by Platinum Group Metals for Applications in Thermal Barrier Coatings. J. of Materi Eng and Perform 26, 3191–3203 (2017). https://doi.org/10.1007/s11665-017-2749-9

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