Characterization of Li2TiO3 pebbles by graphite bed process
Characterization of Li2TiO3 pebbles by graphite bed process
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DOI：
10.1016/j.jnucmat.2013.06.024
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发表时间：
2013-10
影响因子：
3.1
通讯作者：
M. Hong;Yingchun Zhang;Yingying Mi;Baojian Fu
中科院分区：
文献类型：
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作者：
M. Hong;Yingchun Zhang;Yingying Mi;Baojian Fu
钛酸锂（Li2TiO3）是聚变包层概念的重要氚增殖剂。采用石墨床法制备了Li2TiO3陶瓷小球。在此过程中，刻有球形凹坑的石墨床充当铸型。Li2TiO3悬浮液的液滴分散到球形凹坑中，由于石墨粉末的疏水性质而形成卵石。干燥后，将绿色卵石过筛并烧结以制备Li 2 TiO 3卵石。研究了卵石的制备工艺和性能。实验结果表明，固液比和粒径对Li2TiO3小球的球形度有影响。XRD结果表明，采用石墨床法制备了高纯度的Li2TiO3小球。扫描电镜显示，卵石具有均匀的微观结构和足够的开孔率。在1150 °C下烧结的Li2TiO3卵石具有最佳性能，例如高密度（约90%TD）和高压碎载荷（约40 N）。
Lithium titanate (Li2TiO3) is an important tritium breeder for fusion blanket concepts. In the present study, Li2TiO3ceramic pebbles were successfully fabricated by a graphite bed process. In this process, graphite bed which had been engraved with spherical pits acted as a casting mould. Droplets of Li2TiO3suspensions were dispersed into the spherical pits to form pebbles due to the hydrophobic nature of the graphite powder. After drying, green pebbles were sieved and sintered to produce Li2TiO3pebbles. The fabrication process and properties of the pebbles have been investigated. The experimental results showed that the sphericity of Li2TiO3pebbles was influenced by solid/liquid ratio and diameter. XRD results demonstrated that Li2TiO3pebbles with high purity have been prepared by the graphite bed process. SEM revealed that the pebbles have uniform microstructure and adequate open porosity. The Li2TiO3pebbles sintered at 1150 °C have optimal properties, such as high density (about 90% TD) and high crush load (about 40 N).