Enhanced fabrication process for lithium orthosilicate pebbles as breeding material
Enhanced fabrication process for lithium orthosilicate pebbles as breeding material
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DOI：
10.1016/j.fusengdes.2011.01.104
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发表时间：
2011-10
影响因子：
1.7
通讯作者：
M. Kolb;R. Knitter;U. Kaufmann;D. Mundt
中科院分区：
文献类型：
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作者：
M. Kolb;R. Knitter;U. Kaufmann;D. Mundt
欧盟提出的固体增殖毯概念将氚增殖陶瓷作为几个增殖单元内的卵石床。卵石床不会增加增殖装置的结构刚性。尽管如此，鹅卵石仍需要承受来自热膨胀不匹配和中子辐照的力。为这个概念指定的增殖陶瓷是锂正硅酸盐与硅的轻微过剩。研究表明，正硅酸锂可采用熔融喷涂工艺处理，有利于其他工艺的回收利用。这项工作总结了工艺的变化和对当前限制的研究，这些限制不仅要提高鹅卵石的机械性能，还要提高工艺的产量。改进的一个关键特征是比过去更精确地控制单个鹅卵石的形成。因此，不仅要避免孔隙的产生，而且要更精确地控制卵石的粒度分布。
The solid breeder blanket concept proposed by the European Union features the tritium breeding ceramics as pebble beds inside several breeder units. The pebble bed will not take part in the structural rigidity of a breeder unit. Still the pebbles need to withstand forces originating from thermal expansion mismatches and neutron irradiation. A designated breeder ceramic for this concept is lithium orthosilicate with a slight surplus of silica. It has been demonstrated that lithium orthosilicate can be processed by melt spraying, which is favorable to other processes in terms of recycling. This work summarizes changes to the process and investigations of the current limitations that have to be overcome to enhance not only the mechanical properties of the pebbles, but also the yield of the process. A key feature of the improvements is to control the forming of the single pebbles more precisely than in the past. Thereby, not only the generation of pores should be avoided, but also the size distribution of the pebbles should be more accurately controlled.