Transformation of Al2O3 to LiAlO2 in Pb-17Li at 800 °C

B. A. Pint; K. L. More

doi:10.1016/j.jnucmat.2007.12.010

Transformation of Al₂O₃ to LiAlO₂ in Pb-17Li at 800 °C

B. A. Pint, K. L. More

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

A FeCrAl substrate was pre-oxidized for 2 h at 1000 °C to thermally grow an external Al₂O₃ scale and then isothermally exposed to Pb-17 at.% Li for 1000 h at 800 °C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO₂ with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al₂O₃ as a permeation barrier in Pb-Li cooled fusion blanket systems.

Original language	English
Pages (from-to)	108-113
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	376
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2007.12.010
State	Published - May 15 2008

Funding

The research was sponsored by the US Department of Energy (DOE), Office of Fusion Energy Sciences, Fusion Energy Materials Program, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC. D.F. Wilson and J.R. DiStefano consulted on the experimental procedure. J.L. Moser, K.S. Reeves, T. Brummett and D. Coffey assisted with the experimental work. D. Hoelzer and J.R. DiStefano provided comments on the manuscript.

Funders	Funder number
Fusion Energy Materials Program	DE-AC05-00OR22725
U.S. Department of Energy
Fusion Energy Sciences

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jnucmat.2007.12.010

Cite this

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abstract = "A FeCrAl substrate was pre-oxidized for 2 h at 1000 °C to thermally grow an external Al2O3 scale and then isothermally exposed to Pb-17 at.% Li for 1000 h at 800 °C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO2 with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al2O3 as a permeation barrier in Pb-Li cooled fusion blanket systems.",

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N2 - A FeCrAl substrate was pre-oxidized for 2 h at 1000 °C to thermally grow an external Al2O3 scale and then isothermally exposed to Pb-17 at.% Li for 1000 h at 800 °C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO2 with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al2O3 as a permeation barrier in Pb-Li cooled fusion blanket systems.

AB - A FeCrAl substrate was pre-oxidized for 2 h at 1000 °C to thermally grow an external Al2O3 scale and then isothermally exposed to Pb-17 at.% Li for 1000 h at 800 °C to determine if this layer would protect the underlying alloy from dissolution. After exposure, a small mass gain was measured, indicating that the layer did inhibit dissolution. However, characterization of the external layer determined that it had transformed to LiAlO2 with an increased thickness and a much larger grain size than the original layer. This observation has implications for the use of Al2O3 as a permeation barrier in Pb-Li cooled fusion blanket systems.

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