二氧化钍箔片制备技术研究  

Research on Preparation Technology of Thorium Dioxide Foil

作　　者：茹利利 何亚斌[1] 郭洪[1] 刘文涛[1] 蔡振方 

机构地区：[1]中核北方核燃料元件有限公司,内蒙古包头014035

出　　处：《原子能科学技术》2015年第B05期443-448,共6页Atomic Energy Science and Technology

摘　　要：二氧化钍箔片是用于新型反应堆的模拟燃料芯块，其厚度仅为0．5-1mm，直径为17-31mm，成型难度大、烧结变形严重。本文采用粉末制粒、成型及烧结三道主要工序制备二氧化钍箔片。对不同方法制得的粉末进行箔片生坯成型，通过比较箔片的表面质量判断制粒方法的优劣，用成型获得的箔片进行包括箔片装料方式及温度控制的烧结工艺研究。结果表明：二氧化钍粉末中添加适量聚乙烯醇黏结剂后进行制粒和成型，能克服由于箔片强度低而生坯脱模开裂的问题，从而获得表面质量较好的二氧化钍箔片生坯，同时采用“块夹片”的烧结装料方式，并延长低温保温时间，可获得满足尺寸要求且表面平整的箔片。The thorium dioxide foils are used as simulation fuel pellets for the new reactor, the thickness is only 0.5-1 mm, and the diameter is 17-31 mm, with the difficulty of compaction and the severe deformation of sintering. The thorium dioxide foils were prepared by three main processes of powder granulation, compaction and sintering. The powders prepared by different methods were used for compaction foils, which surfaces quality were compared for determining optimal granulation method, and the foils prepared by compaction were used to research the sintering process including foil loading method and temperature control. The results show that adding the appropriate amount of PVA binder to thorium dioxide power before granulation and compaction can overcome the problem of stripping cracking owing to low intensity of the foil, and excellent surface quality of green foils can be acquired, meanwhile using the loading way of ＂foils clamped by pellets＂ and extending the low-temperature holding time, the foils with suitable size and flat surface can be obtained.

关 键 词：二氧化钍 箔片 制粒 成型 烧结 

分 类 号：TL364.5[核科学技术—核技术及应用]