Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment

Ohriner, Evan; Yang, Ying

doi:10.1007/s11669-018-0637-0

Title: Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment

Journal Article · 21 May 2018 · Journal of Phase Equilibria and Diffusion

DOI: https://doi.org/10.1007/s11669-018-0637-0 · OSTI ID:1460200

Ohriner, Evan ^[1]; Yang, Ying ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

The goal of this paper was to understand the possible reactions between Ir and SiO₂ contaminants in the presence of C (graphite insulation) and a cover gas for conditions representative of those for a module reduction and monitoring treatment at 1410 K. This treatment is for reduction of ²³⁸PuO₂ fuel used in isotopic heat sources for space missions. A thermodynamic analysis has been performed for the relevant portions of the Ir-Si-C-O phase diagram using the CALPHAD method. The results show that over the range of relevant pressures of CO and CO₂ in the argon cover gas, SiO₂ is not stable in the presence of Ir. Finally, levels of Si impurity dissolved in the iridium solid solution are expected to be up to 875 μg/g at or near the surface.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Infrastructure Programs. Nuclear Facility Operations; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1460200

Journal Information:: Journal of Phase Equilibria and Diffusion, Vol. 39, Issue 5; ISSN 1547-7037

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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