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Reactivity of plasma-sintered beryllium in dry air and moisture at high temperature

高温における乾燥空気及び水蒸気でのプラズマ焼結ベリリウムの反応性

金 宰煥; 中道 勝

Kim, Jae-Hwan; Nakamichi, Masaru

Beryllium metal is a candidate material of not only neutron-multiplier for fusion reactors but also a water-cooled target material for an accelerator-based boron neutron capture therapy. To investigate its reactivity in dry air and 1% H$$_{2}$$O/Ar at 873, 1073, and 1273 K, Be samples were fabricated by a novel plasma-sintering method proposed herein. Because of its reactivity in dry atmosphere, parabolic oxidation of Be along grain boundaries was predominant up to 1173 K at an activation energy of 52 kJ/mol, while catastrophic oxidation occurred at 1273 K. The introduction of H$$_{2}$$O facilitated breakaway in Be oxidation. Hence, the weight and H$$_{2}$$ concentration of Be tested in 1% H$$_{2}$$O/Ar dramatically increased from 973 K, while samples tested for 24 h were completely oxidized in appearance.

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パーセンタイル:100

分野:Nuclear Science & Technology

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