Solid tritium breeding materials are used in a high temperature condition for a long time in a fusion reactor blanket. It is expected that a certain amount of Li will be evaporated and the pebble structure will be changed. Understanding of Li mass transfer behavior in the blanket is an important issue from viewpoints of establishment of tritium cycle and tritium safety. In this work the pebbles of Li₂TiO₃ with excess Li were heated at 900 °C in 1000 Pa H₂/Ar flow for a long time (72, 240, 720, 1200 h). The amount of Li mass loss under the hydrogen atmosphere was 0.665 wt% which was less than that under the water vapor atmosphere observed in the previous study. No significant Li mass loss was observed after 240 h. By heating for 240 h, the grain diameter increased from 1.8 to 3.1 μm and the specific surface area decreased from 0.72 to 0.20 m²/g. After 240 h, no significant grain growth and no significant decrease in the specific surface area were observed. From these results, it seems that there is a relation between Li mass loss and grain growth.

固态tri育种材料在高温条件下在聚变反应堆毯子中长期使用。预计会蒸发掉一定量的Li，从而改变卵石结构。从建立cycle循环和and安全性的角度来看，了解毯子中锂的传质行为是一个重要的问题。在这项工作中，将含过量Li的Li ₂ TiO ₃小卵在900 Pa的H ₂中加热到900°C/ Ar流长时间（72、240、720、1200 h）。在氢气氛下Li质量损失的量为0.665wt％，这比先前研究中观察到的在水蒸气气氛下的Li质量损失的量少。240小时后未观察到明显的锂质量损失。通过加热240小时，晶粒直径从1.8增加到3.1μm，并且比表面积从0.72减少到0.20m ² / g。240小时后，未观察到明显的晶粒长大，比表面积也没有显着降低。从这些结果看来，Li质量损失与晶粒生长之间存在关系。