Materials property changes in ETU-10 graphite due to neutron irradiation at elevated temperatures

Campbell, Anne A.; Selby, Aaron; Cetiner, Nesrin; Snead, Mary; Ohashi, Jun; Takagi, Takashi; Katoh, Yutai

doi:10.1016/j.carbon.2025.120178

Materials property changes in ETU-10 graphite due to neutron irradiation at elevated temperatures

Journal Article · Fri Feb 28 00:00:00 EST 2025 · Carbon

DOI:https://doi.org/10.1016/j.carbon.2025.120178· OSTI ID:2538445

^[1]; Selby, Aaron ^[1]; ^[1]; Snead, Mary ^[1]; Ohashi, Jun ^[2]; Takagi, Takashi ^[2]; ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
IBIDEN Co., Ltd. (Japan)

Graphite grade ETU-10, from IBIDEN Co., Ltd. Has been irradiated in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). The irradiation program was developed to provide a preliminary study the irradiation-induced property changes to the dimensions/volume, elastic properties, strength, electrical resistivity, coefficient of thermal expansion, and thermal diffusivity/conductivity over a range of temperatures and neutron exposures that may be relevant for future nuclear reactors. The irradiation envelope covers a range of irradiation temperatures (300°C–900 °C) and fluences (up to 40 × 10²⁵ n/m² [E > 0.1 MeV] or ~30 dpa) that would be relevant for advanced nuclear reactors. Further, the dimensional change was observed to be anisotropic for an isotropic graphite, the specimen dimensions, volume, Young's modulus, shear modulus, and strength all displayed a parabolic fluence dependence, the electrical resistivity had a rapid rise followed by a decrease and a later increase, at high fluence the mean coefficient of thermal expansions was similar for all irradiation temperatures, and thermal conductivity rapidly decreased followed by a continued loss.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2538445

Journal Information:: Carbon, Journal Name: Carbon Vol. 238; ISSN 0008-6223

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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