STP1175

    Effect of Neutron Irradiation on Thermal Conductivity of Carbon/Carbon Fiber Materials at 400 and 600°C in the Fluence Range 1 × 1022 to 1 × 1024 m-2

    Published: Jan 1994


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    Abstract

    Because of their low atomic number and excellent thermal conductivity, carbon/ carbon fiber materials are seen as potential candidates for plasma-facing components, such as divertors, in Tokamak fusion devices. In the technology phase of Next European Torus (NET) or International Thermonuclear Experimental Reactor (ITER), the surface of a divertor will operate between 400 and 1000°C, and the materials will accumulate a lifetime neutron fluence equivalent to a dpa damage of 0.1. Low doses of neutron irradiation cause a significant decrease in the thermal conductivity of graphitic materials at low temperatures. To quantify the effect, candidate materials such as fine- and superfine-grained graphites (as reference materials), carbon/carbon fiber composites, and an oriented pyrolytic carbon (PyC) were irradiated at 400 and 600°C up to 0.1 dpa. At this fluence and at 400°C, the thermal conductivity (/) is reduced by 40 to 60%, whereas irradiation at 600°C caused a reduction of the l-values at irradiation temperature by about 20 to 40%. This spread seems to be caused by material differences but could be due to the uncertainties in the measurement and neutron fluence.

    Keywords:

    neutron irradiation, carbon/carbon fiber composites, pyrocarbon, fine-grained graphites, thermal conductivity


    Author Information:

    Thiele, BA
    Research scientists, Institute for Reactor Materials, Forschungszentrum Jülich, Jülich,

    Binkele, L
    Research scientists, Institute for Reactor Materials, Forschungszentrum Jülich, Jülich,

    Koizlik, K
    Research scientists, Institute for Reactor Materials, Forschungszentrum Jülich, Jülich,

    Nickel, H
    Head of the Institute for Reactor Materials, Forschungszentrum Jülich, Jülich,


    Paper ID: STP24006S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP24006S


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