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