High-temperature tests of fine-grained dense graphite composites to predict the lifetime of a neutron target converter |
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| Authors: | E I Zhmurikov A I Romanenko P V Logachev K V Gubin O B Anikeeva Tecchio Luigi |
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| Institution: | (1) Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia;(2) Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia;(3) Novosibirsk State University, Novosibirsk, Russia;(4) Lenjaro National Laboratory, National Institute of Nuclear Physics, Italy |
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| Abstract: | The conductivity of graphite composite samples MPG-6 and MPG-7 has been measured before and after 1.4 MeV electron irradiation and heating by alternating current up to temperatures higher than 2500°C, causing the fracture of the samples. It has been shown that both heating and electron irradiation result in a shift of the temperature dependence of the conductivity of the samples, namely, in an increase in conductivity. The measurements of the relative magnetoresistance at helium temperature in fields of ±1.15 T have shown that the imperfection of the macrostructure increases. The noticeable changes in the x-ray phase diagram do not observed up to the fracture of the samples. All the obtained data make it possible to suppose that the ultimate strength and the lifetime of graphite composites are limited by intercrystalline or grain boundaries. |
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