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Efficient, durable protection of the Ti6242S titanium alloy against high-temperature oxidation through MOCVD processed amorphous alumina coatings

  • Metals & corrosion
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Abstract

With their exceptional strength-to-weight ratio, titanium alloys find applications in numerous key enabling technologies. However, their implementation in harsh environments comes up against their limited resistance to high-temperature oxidation. To face this problem, in this work dense, amorphous alumina, Al2O3 coatings are applied on the surface of Ti6242S alloy by metalorganic chemical vapor deposition, MOCVD, from aluminum triisopropoxide, ATI and from dimethylaluminum isopropoxide, DMAI. Isothermal oxidation tests show that the parabolic rate constants of the mass gain of the coated Ti6242S coupons are reduced up to two orders of magnitude compared with the bare material. 5000 h long oxidation of DMAI Al2O3 coated alloy at 600 °C results in 0.180 mg cm−2 weight gain to be compared with 1.143 mg cm−2 for the bare alloy. In these conditions, an interfacial layer is formed, containing the complex Ti3(Al0.5Sn0.5) (or (Ti,Sn)2N) phase. Cyclic oxidation consisting of eighty, 1 h cycles between 50 and 600 °C show null mass gain of the coated sample. Finally, the hardness profiles determined on cross sections of oxidized coupons reveal a very limited oxygen dissolution for the coated alloy. MOCVD coatings of amorphous Al2O3 have great potential for efficient, durable protection against oxidation of Ti6242S alloys.

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Notes

  1. https://materialsproject.org/materials/mp-1823/, and https://materialsproject.org/materials/mp-21030/for Ti3Al and Ti3Sn, respectively. Last visited November 15, 2019.

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Acknowledgements

The support by the STAE-RTRA Foundation (Toulouse, France) under the RTRA-STAE/2014/P/VIMA/12 (Fondation Sciences et Technologies pour l’Aéronautique et l’Espace) Project Grant is acknowledged.

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Authors and Affiliations

  1. CIRIMAT - CNRS, Université de Toulouse, 4, Allée Emile Monso, BP-44362, 31030, Toulouse Cedex 4, France

    Diane Samélor, Loïc Baggetto, Alain N. Gleizes, Thomas Duguet, Daniel Monceau & Constantin Vahlas

  2. CIRIMAT - CNRS, Université de Toulouse, 118 Route de Narbonne, 31062, Toulouse Cedex 9, France

    Raphaël Laloo & Viviane Turq

Authors
  1. Diane Samélor
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  2. Loïc Baggetto
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  4. Viviane Turq
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  5. Alain N. Gleizes
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  6. Thomas Duguet
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  7. Daniel Monceau
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  8. Constantin Vahlas
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Contributions

DS and LB performed the deposition experiments and the SEM characterizations. They contributed equally to this work. RL and VT performed the mechanical characterizations. TD performed the nanoAuger characterizations. ANG performed the XRD characterizations. DM defined the experimental design for isothermal and cyclic oxidation tests. CV designed the project and coordinated the work. All co-authors contributed to the manuscript composition.

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Correspondence to Constantin Vahlas.

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Samélor, D., Baggetto, L., Laloo, R. et al. Efficient, durable protection of the Ti6242S titanium alloy against high-temperature oxidation through MOCVD processed amorphous alumina coatings. J Mater Sci 55, 4883–4895 (2020). https://doi.org/10.1007/s10853-019-04277-y

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