氚增殖剂Li_4SiO_4陶瓷小球的制备工艺  

Preparation Process of Li_4SiO_4 Pebbles as Tritium Breeding Materials

作　　者：尹邦跃[1] 牛恺[1] 

机构地区：[1]中国原子能科学研究院反应堆工程研究设计所,北京102413

出　　处：《原子能科学技术》2011年第1期73-79,共7页Atomic Energy Science and Technology

摘　　要：欧洲和中国聚变堆固态产氚包层(TBM)的氚增殖剂倾向于采用直径0.5～2mm的Li4SiO4陶瓷小球填充床。本工作探讨锂陶瓷小球的性能指标设计,研究挤压-滚圆、烧结法制备Li4SiO4小球的工艺可行性,测试分析小球的密度、直径、球形度、晶粒尺寸、压碎载荷等性能。研究表明:挤压-滚圆成型、1 050℃无压烧结的Li4SiO4陶瓷小球密度为90.4%TD,堆积密度为52.9%TD;平均直径为0.95mm,标准偏差为0.15mm;球形度为1.10;平均压碎载荷为18.50N,标准偏差为2.76N;平均晶粒尺寸为14μm;相结构由Li4SiO4主晶相、少量Li2SiO3和Li2Si2O5等组成。采用优化的挤压-滚圆、烧结工艺可制备出合格的Li4SiO4陶瓷小球产品。Li4SiO4 with a diameter of 0.5-2 mm has been candidated as solid-state tritium breeder material for the testing blanket module（TBM） of fusion reactor being developed in Europe and China.Performance designs of Li ceramics pebbles were discussed,extrusion-spheronisation-sintering process of Li4SiO4 pebbles were studied,and density,diameter,sphericity,grain size and crush load of pebbles were analyzed and characterized.Li4SiO4 pebbles sintered at 1 050 ℃ have a density of 90.4%TD,pebbled bed density 52.9%TD,diameter（0.95±0.15） mm,sphericity 1.10,crush load（18.50±2.76） N,average grain size 14 μm,phase structures of Li4SiO4（main）,Li2SiO3 and Li2Si2O5.Products of Li4SiO4 pebbles can be fabricated by the improved extrusion-spheronisation and sintering processes.

关 键 词：Li4SiO4 小球 挤压-滚圆 成型 烧结 

分 类 号：TL352[核科学技术—核技术及应用] TL349