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Assessment of the Oxidation Behavior of a Pt-Based Alloy for High Temperature Applications

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Abstract

Pt-based alloys are being developed as a possible future replacement for Ni-based superalloy components in the hottest section of turbine engines. The critical properties of these alloys are their ability to withstand higher thermal and mechanical stresses as well as to resist aggressive corrosive and oxidizing environments in applications. Oxidation properties of these alloys were investigated between 1150 and 1350 °C. The surface roughness of the as-polished samples was determined using atomic force microscopy, while the microstructures of both the as-polished and oxidized samples were examined using scanning electron microscopy. The alloy was found to be composed of a two-phase gamma/gamma prime microstructure, while the average surface roughness decreased from 5.78 nm after 1 μm diamond paste polishing to 4.13 nm with 0.25 μm diamond paste polishing. Microstructure examination of the oxidized alloy samples revealed the formation of compact and protective external oxide scale composed of α-alumina, as confirmed by the XRD and Raman spectroscopy. The results also showed that the oxide scale thickens with increased exposure time and temperatures according to parabolic kinetics. It was concluded from the results that the Pt-based alloys possess good oxidation resistance and thus will be suitable for high temperature applications, such as turbine engines.

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Acknowledgments

The authors wish to acknowledge the technical assistance provided during the course of this study by R. Erasmus (Raman spectroscopy), C. Oliphant (SEM), G. Malgas (SEM), and S. K. Pillai (SEM). The DST/NRF Centre of Excellence in Strong Materials is also acknowledged for funding the research and Mintek for support, especially Dr R. Süss. Prof. K. Pruessner is thanked for initial interest. The support of the University of Ilorin, Ilorin, is also acknowledged.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Engineering, University of Ilorin, Ilorin, Nigeria

    J. K. Odusote

  2. School of Physics and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, South Africa

    J. K. Odusote

  3. DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, South Africa

    L. A. Cornish & J. M. Papo

  4. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa

    L. A. Cornish

  5. Advanced Materials Division, Mintek, Randburg, South Africa

    J. M. Papo

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  1. J. K. Odusote
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Correspondence to J. K. Odusote.

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Odusote, J.K., Cornish, L.A. & Papo, J.M. Assessment of the Oxidation Behavior of a Pt-Based Alloy for High Temperature Applications. J. of Materi Eng and Perform 22, 3466–3475 (2013). https://doi.org/10.1007/s11665-013-0611-2

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  • DOI: https://doi.org/10.1007/s11665-013-0611-2

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