Fabrication of Li2O ceramic pebbles by freeze drying process
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摘要: 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%。Abstract: 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.
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Key words:
- Li2O /
- pebbles /
- freeze drying /
- calcination /
- decomposition /
- sintering
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图 1 不同温度下煅烧凝胶小球的表面形貌图
Figure 1. SEM photographs of gel spheres at different calcination temperature
图 2 650 ℃温度煅烧后的Li2CO3小球的XRD谱图
Figure 2. XRD pattern of Li2CO3 spheres after calcination at 650 ℃
图 3 不同分解温度下小球的XRD谱图
Figure 3. XRD patterns of Li2O spheres after thermal decomposition at different temperature
图 4 900 ℃烧结的Li2O小球的粒径分布与宏观图片
Figure 4. Statistical distributions of diameter and morphology of Li2O pebbles (sintered at 900 ℃)
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