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

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Pub Date : 2025-02-28 DOI:10.1016/j.carbon.2025.120178

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

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Abstract

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. 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.

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高温中子辐照对ETU-10石墨材料性能的影响

石墨级ETU-10， IBIDEN有限公司在橡树岭国家实验室（ORNL）的高通量同位素反应堆（HFIR）中辐照。开发辐照程序是为了对辐照引起的尺寸/体积、弹性性能、强度、电阻率、热膨胀系数和热扩散率/电导率在一定温度范围内的变化进行初步研究，这些变化可能与未来的核反应堆有关。辐照包线涵盖辐照温度范围（300°C - 900°C）和影响范围（高达40 × 1025 n/m2） [E >；0.1 MeV]或~ 30 dpa)，这将与先进的核反应堆相关。各向同性石墨的尺寸变化呈各向异性，试样的尺寸、体积、杨氏模量、剪切模量和强度均呈抛物线型影响关系，电阻率呈先上升后下降后增加的趋势，在高影响下，各辐照温度下的平均热膨胀系数基本一致，导热系数迅速下降后继续下降。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.