冷冻干燥法制备Li2O氚增殖剂陶瓷小球

以Li₂CO₃粉末为原料，采用一种冷冻干燥湿法工艺，制备出综合性能较好的Li₂O陶瓷小球。通过研究冷冻成形、煅烧、分解和烧结等工艺过程，优化了Li₂O陶瓷小球的制备工艺，并对获得的Li₂O陶瓷小球进行了性能表征。结果表明:冷冻成形制备的凝胶小球在650 ℃煅烧后可得到纯净的Li₂CO₃小球，再于真空条件下多步程序升温至720 ℃可制得主要相为Li₂O的小球，小球尺寸分布均匀，直径约为0.8 mm，平均晶粒尺寸为9 μm，于900 ℃高温烧结后小球的密度可达理论密度的69.5%。

Fabrication of Li2O ceramic pebbles by freeze drying process

Lithium oxide (Li₂O) is one of the best tritium breeding materials. A new wet process, freeze drying method, was used to prepare Li₂O pebbles by Li₂CO₃ powder. Preliminary fabrication tests including freezing, calcination and decomposition were carried out to investigate the fabrication technique parameter of Li₂O pebbles. It is suggested that Li₂O pebbles can be fabricated by the decomposition of Li₂CO₃ pebbles at 720 ℃, which were prepared by freeze drying method and calcinated at 650 ℃. Li₂O pebbles sintered at 900 ℃ have a diameter of 0.8 mm, grain size of 9 μm, density of 69.5% theoretical density and porous structure.