Fabrication of the Li2TiO3 tritium breeder pebbles by a capillary-based microfluidic wet process

Fabrication of the Li2TiO3 tritium breeder pebbles by a capillary-based microfluidic wet process
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采用基于毛细管的微流体湿法工艺制造 Li2TiO3 氚增殖卵石

DOI:
10.1080/00223131.2015.1037806
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发表时间:
2016-02
影响因子:
1.2
通讯作者:
常振旗
常振旗
中科院分区:
工程技术4区
文献类型:
--
作者:
常振旗

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Li 2 TiO 3是氚增殖剂中最有前途的候选者之一。以商业Li 2 TiO 3粉体为原料,采用共流毛细管微流控湿法合成了粒径分布窄、密度高、粒径小、球形度好的Li 2 TiO 3小球。在微流控装置中形成了高度均匀的含有Li 2 TiO 3粉末和聚乙烯醇的浆料液滴,然后通过聚乙烯醇和Li 2 TiO 3之间的交联反应固化。烧结后的绿色体最终得到锂二氧化钛卵石。通过调节分散相和连续相的流速,可以将具有良好球形度(Dmax/Dmin < 1.05)的烧结Li 2 TiO 3小球的尺寸精确地控制在400-1000 µm的尺寸范围内。研究了煅烧方法、烧结条件、料浆固含量、粉体粒度等因素对所制备的Li 2 TiO 3小球相对密度的影响,得到了97. 16% T.D.(理论密度)制造具有5 µm粒度的卵石的最大相对密度。
Li2TiO3 is one of the most promising candidates among tritium breeders. In this work, Li2TiO3 pebbles with a narrow size distribution, high density, small grain size, and good sphericity are synthesized using the commercial Li2TiO3 powder as the raw material by a co-flow capillary-based microfluidic wet process. Highly uniform slurry droplets containing Li2TiO3 powder and polyvinyl alcohol were formed in the microfluidic device and then solidified with the cross-linking reaction between polyvinyl alcohol and borax. Li2TiO3 pebbles were finally obtained after sintering the green bodies. The size of sintered Li2TiO3 pebbles with a good sphericity (Dmax/Dmin < 1.05) can be controlled precisely in a size range of 400–1000 µm by adjusting the flow rate of disperse and continuous phases. The effects of the calcination method, sintering condition, solid content of slurry, and the particle size of Li2TiO3 powder on the relative density of Li2TiO3 pebbles prepared were studied in detail, and 97.16% T.D. (Theoretical Density) maximum relative density of the pebbles with 5 µm grain size were fabricated.
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