[2L01-08] トリチウム放出挙動・生産・測定

[2L03] Comprehensive Stability Improvement of Core-shell Structured Li₄TiO₄-Li₂TiO₃ Tritium Breeding Ceramic Pebbles by Pvp-Assisted Granulation

*Ruichong Chen¹、片山 一成² (1. 四川大学、2. 九州大学)

キーワード：トリチウム増殖材、Li4TiO4、Li2TiO3

The development of tritium breeder materials with high lithium density and stable chemical properties has become an active research field in recent years. we have designed a novel approach with PVP acting as a bridging agent when fabricating Li₄TiO₄-Li₂TiO₃ core-shell pebbles by granulation technology. The phase compositions, morphology and microstructure of Li₄TiO₄-Li₂TiO₃ core-shell pebble were investigated. Such an advanced pebbles exhibit a uniform core-shell structure with a Li₄TiO₄ core diameter of ~800 μm and Li₂TiO₃ shell thickness of ~500 μm. The results show that the weight of Li₄TiO₄-Li₂TiO₃ core-shell pebble does not increase during the temperature rise to 900 °C in a 100.vol% CO₂ atmosphere, indicating that it has satisfactory CO₂ barrier properties. It is also noted that the Li₂TiO₃ shell can also significantly improve the crush load of Li₄TiO₄ pebbles, which can prevent damages caused by the high-density accumulation of pebbles in the blanket. Moreover, the water vapor release behavior and weight reduction of Li₄TiO₄-Li₂TiO₃ core-shell pebble at elevated temperatures under hydrogen atmosphere were also investigated.