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Pre-Oxidation to Improve Liquid Metal Compatibility

Abstract

Liquid metals represent an aggressive environment where selective degradation can attack structural alloys. Pre-oxidizing structural alloys, particularly those able to form alumina scales, have shown promise for Sn, Pb and Pb–Li concepts for fusion and fission applications. For Pb at 700 °C, a dramatic reduction in mass loss was observed for an alumina-forming austenitic (AFA) steel after pre-oxidation. Likewise, a ferritic FeCrAlMo alloy showed better compatibility in static Sn at 400–500 °C and flowing PbLi when pre-oxidized at 1000 °C to form α-Al2O3. Recent experiments with flowing PbLi at 675–700 °C has shown significant degradation suggesting that alumina-forming alloys are limited to ~ 650 °C in this environment. While the concept is promising, most experiments have been relatively short-term and long-term degradation mechanisms need to be evaluated.

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Acknowledgements

This research was funded by the U.S. Department of Energy, Office of Fusion Energy Sciences and Office of Nuclear Energy, GAIN program. The experimental work at ORNL was assisted by A. Willoughby, M. Stephens, T. Lowe and V. Cox. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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Correspondence to Bruce A. Pint.

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Pint, B.A., Jun, J. Pre-Oxidation to Improve Liquid Metal Compatibility. Oxid Met 96, 231–240 (2021). https://doi.org/10.1007/s11085-021-10057-4

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Keywords

  • Fusion energy
  • Nuclear energy
  • Liquid metal compatibility