陶瓷UO_2微球尺寸与球度的控制方法  

THE CONTROL METHOD OF SIZE AND SPHERICITY FOR CERAMIC UO 2 MICROSPHERES

作　　者：徐志昌[1] 张萍[1] 

机构地区：[1]清华大学核能技术设计研究院

出　　处：《核科学与工程》1997年第1期52-59,共8页Nuclear Science and Engineering

摘　　要：陶瓷ＵＯ２微球尺寸与球度的控制问题，不仅是溶胶－凝胶工艺研究中的重要课题，也是高温气冷堆燃料元件生产中的重要课题。因此，近几年来通过批量试验对全胶凝工艺控制包覆芯核尺寸与球度的方法进行了研究，并取得了阶段性进展，为１０ＭＷ高温堆燃料芯核的生产奠定了基础。结果表明：ＵＯ２芯核尺寸与球度的控制主要是通过控制溶胶分散参数来实现的。对单一振动喷嘴而言，其分散参数应当同时满足均匀分散流量方程和振动频率方程的要求；另一方面为了控制芯核的球度，还必须对喷嘴的振动加速度、３区高度及气相氨的分布进行控制。For the total gelation process of Uranium(TGU), the control method of size and sphericity for the ceramic UO 2 micro-spheres have been studied in recent year. The aim of this paper is to control quantity of coated kernels, UO 2 microspheres for HTGR. The results have shown that the size control is achieved by means of vibration frequency control for each nozzle, Viz. f =23 5 Q L ρ s, and the sphericity control is achieved by the control of sol compositions, three zone construction, i.e. the length of continuous phase, h 1, ammonia gas-free zone, h 2, and ammonia gas zone, h 3, and the vibration velocity of the nozzle, finaly, the control method of the oxygen content and the density are acheived by hydrogen reduction for low temperature and pure hydrogen sintering.

关 键 词：包覆芯核 球度控制 二氧化铀 气冷堆 燃料元件 

分 类 号：TL424[核科学技术—核技术及应用] TL352