Increase in pyrolytic carbon optical anisotropy and density during processing of coated particle fuel due to heat treatment

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2007.10.003· OSTI ID:936282

Hunn, John D ^[1]; Jellison, Jr, Gerald Earle ^[1]; Lowden, Richard Andrew ^[1]

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1. ORNL

Measurements of pyrolytic carbon optical anisotropy and density have been made on a series of tri-isotropic (TRISO) coated particles prepared for the United States Department of Energy's Advanced Gas Reactor Fuel Development and Qualification (AGR) program. These measurements show the effect of varying the deposition conditions, especially the deposition temperature, on the density and optical anisotropy of the carbon layers. Additional heat treatment studies of the coated particles at various stages illustrate the strong effect of post-deposition thermal processing on these two pyrolytic carbon properties. Such post-deposition heat treatment occurs during SiC deposition and fuel compact firing, resulting in a microstructural modification of the pyrolytic carbon which increases the anisotropy and density of these layers.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 936282
• Journal Information: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 3 Vol. 374
• Country of Publication: United States
• Language: English

Related Subjects

2-MGEM
TRISO
anisotropy
coated particle fuel
diattenuation