Characterization of Li₂TiO₃ pebbles by graphite bed process

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• 作者：Ming Hong ; Yingchun Zhang ; Yingying Mi ; Baojian Fu
• 刊名：Journal of Nuclear Materials
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：441
• 期：1-3
• 页码：390-394
• 全文大小：1447 K

文摘

Lithium titanate (Li₂TiO₃) is an important tritium breeder for fusion blanket concepts. In the present study, Li₂TiO₃ ceramic 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 Li₂TiO₃ suspensions 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 Li₂TiO₃ pebbles. The fabrication process and properties of the pebbles have been investigated. The experimental results showed that the sphericity of Li₂TiO₃ pebbles was influenced by solid/liquid ratio and diameter. XRD results demonstrated that Li₂TiO₃ pebbles with high purity have been prepared by the graphite bed process. SEM revealed that the pebbles have uniform microstructure and adequate open porosity. The Li₂TiO₃ pebbles sintered at 1150 ¡ãC have optimal properties, such as high density (about 90 % TD) and high crush load (about 40 N).