Ir/PuO/sub 2/ compatibility: transfer of impurities from plutonium dioxide to iridium metal during high temperature aging

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Plutonium oxide fuel pellets for powering radioisotopic thermoelectric generators for NASA space vehicles are encapsulated in iridium which has been grain-boundary-stabilized with thorium and aluminum. After aging for 6 months at 1310/sup 0/C under vacuum, enhanced grain growth is observed in the near-surface grains of the iridium next to the PuO/sub 2/. Examination of the grain boundaries by AES and SIMS shows a depletion of thorium and aluminum. Iron, chromium, and nickel from the fuel were found to diffuse into the iridium along the grain boundaries. Enhanced grain growth appears to result from thorium depletion in the grain boundaries of … continued below

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25 pages

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Taylor, D. H.; Christie, W. H. & Pavone, D. January 1, 1984.

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Plutonium oxide fuel pellets for powering radioisotopic thermoelectric generators for NASA space vehicles are encapsulated in iridium which has been grain-boundary-stabilized with thorium and aluminum. After aging for 6 months at 1310/sup 0/C under vacuum, enhanced grain growth is observed in the near-surface grains of the iridium next to the PuO/sub 2/. Examination of the grain boundaries by AES and SIMS shows a depletion of thorium and aluminum. Iron, chromium, and nickel from the fuel were found to diffuse into the iridium along the grain boundaries. Enhanced grain growth appears to result from thorium depletion in the grain boundaries of the near-surface grains next to the fuel. However, in one instance grain growth was slowed by the formation of thorium oxide by oxygen diffusing up the grain boundaries.

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25 pages

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NTIS, PC A02/MF A01; 1.

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  • 113. annual meeting of the American Institute of Mining, Metallurgical and Petroleum Engineers, Los Angeles, CA, USA, 26 Feb 1984

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  • Other: DE84008301
  • Report No.: DP-MS-83-85
  • Report No.: CONF-840218-4
  • Grant Number: AC09-76SR00001
  • Office of Scientific & Technical Information Report Number: 5048057
  • Archival Resource Key: ark:/67531/metadc1053130

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  • January 1, 1984

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 20, 2021, 9:55 p.m.

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Taylor, D. H.; Christie, W. H. & Pavone, D. Ir/PuO/sub 2/ compatibility: transfer of impurities from plutonium dioxide to iridium metal during high temperature aging, article, January 1, 1984; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1053130/: accessed July 14, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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