学術雑誌論文 Thermal analyses of beryllide pebbles in water vapor atmosphere as advanced neutron multipliers

金, 宰煥  ,  中道, 勝

(124)  , pp.805 - 808 , 2017-04 , Elsevier
ISSN:0920-3796
内容記述
The safety of the water coolant solid breeder blanket of a fusion reactor has become one of the most critical issues. In particular, Be pebbles as a multiplier material have been well-known to generate hydrogen and exothermally react while reacting with water vapor at high temperature. Unlike these Be pebbles,beryllium intermetallic compounds (i.e., beryllides) are one of the most promising materials because oftheir significantly higher chemical stability. Beryllides pebbles have been successfully fabricated by a number of approaches develop combining plasma sintering synthesis and rotating electrode granulation methods Thus, as-received Be12Ti peb-bles (consisting of Be, Be12Ti, and Be17Ti2 phases), homogenized Be12Ti pebbles, and as-received Be17Ti2 pebbles have been successfully fabricated. The oxidation, hydrogen generation, and thermal expansion properties of these pebbles were investigated and compared with those of the reference Be pebbles. Beryllides pebbles were significantly more resistant to oxidation by H2O while generating lower amounts of hydrogen as compared to Be pebbles. Among these beryllides pebbles, homogenized Be12Ti pebbles and as-received Be17Ti2 pebbles showed lower weight gain and hydrogen generation than as-received Be12Ti because the latter contained some fractions of Be phase inside the pebbles. With regard to thermal expansion, it was obvious that the beryllides exhibited lower coefficients of thermal expansion(CTE) than Be.

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