Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

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

Abstract

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.

Authors:
 [1];  [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Nuclear Infrastructure Programs. Nuclear Facility Operations; National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1460200
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Phase Equilibria and Diffusion
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Journal ID: ISSN 1547-7037
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALPHAD; Ir-Si-C-O; phase diagram; thermodynamics

Citation Formats

Ohriner, Evan, and Yang, Ying. Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment. United States: N. p., 2018. Web. doi:10.1007/s11669-018-0637-0.
Copy to clipboard
Ohriner, Evan, & Yang, Ying. Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment. United States. https://doi.org/10.1007/s11669-018-0637-0
Copy to clipboard
Ohriner, Evan, and Yang, Ying. Mon . "Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment". United States. https://doi.org/10.1007/s11669-018-0637-0. https://www.osti.gov/servlets/purl/1460200.
Copy to clipboard
@article{osti_1460200,
title = {Thermodynamic Analysis on Interactions of Silicon Dioxide with Iridium During Module Reduction and Monitoring Treatment},
author = {Ohriner, Evan and Yang, Ying},
abstractNote = {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.},
doi = {10.1007/s11669-018-0637-0},
journal = {Journal of Phase Equilibria and Diffusion},
number = 5,
volume = 39,
place = {United States},
year = {Mon May 21 00:00:00 EDT 2018},
month = {Mon May 21 00:00:00 EDT 2018}
}
Copy to clipboard
Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1007/s11669-018-0637-0
Copyright Statement
Other availability
Search WorldCat Search WorldCat to find libraries that may hold this journal
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: Assessed phase diagram of Ir-Si
All figures and tables (5 total)
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Works referenced in this record:

The thermodynamic modeling of multicomponent phase equilibria
journal, December 1997

Computational Thermodynamics
book, January 2007

Phase diagram calculation: past, present and future
journal, January 2004

SGTE data for pure elements
journal, October 1991

Thermochemistry of alloys of transition metals and lanthanide metals with some IIIB and IVB elements in the periodic table
journal, June 2001

Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF)
conference, January 1991

  • Johnson, Ernest W.
  • Proceedings of the eighth symposium on space nuclear power systems, AIP Conference Proceedings
  • DOI: 10.1063/1.39988

CALPHAD-Is It Ready for Superalloy Design?
journal, July 2002

Thermo-Calc & DICTRA, computational tools for materials science
journal, June 2002

Ir-Si (Iridium-Silicon)
journal, July 2007

Thermodynamic assessment of the Pt–Si binary system
journal, March 2008

    Sort by:
    [ × clear filter / sort ]

    Figures / Tables found in this record:

    Fig. 1 (p. 5)figure
    Table 1 (p. 5)table
    Fig. 2 (p. 7)figure
    Fig. 3 (p. 8)figure
    Table 2 (p. 10)table
      [ × clear filter / sort ]
      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

      Similar Records in DOE PAGES and OSTI.GOV collections: