低密度UO_2燃料芯块的制备及微观结构  

Preparation and Microstructures of Lower Density UO_2 Fuel Pellet

作　　者：孙吉昌[1] 张惠英[1] 何长清 乔慧武[1] 

机构地区：[1]中国核动力研究设计院

出　　处：《核动力工程》1991年第2期72-77,共6页Nuclear Power Engineering

摘　　要：本文介绍了在UO_2粉末中加入造孔剂制备低密度UO_2燃枓芯块的方法。试验结果表明,加入4wt％草酸铵可获得85.31%TD的烧结块,其开口孔率为0.69%。加入2wt%聚乙烯醇可获得85.10%TD烧结块,其开口孔率为1.16%。而且,它们的孔隙形态、尺寸及分布都是令人满意的。两者再烧结后芯块密度分别增加了0.22%TD和0.30%TD,晶粒尺寸分别为14.3μm和16.1μm。In this paper, the method fabricating the lower density UO_2 fuel pellet is investigated. The experimental result shows that 85.31%TD pellet, whose open porosity is 0.69%, can be obtained if 4wt% ammonium oxalate is addded. However, 85.10% TD pellet, whose open porosity is 1.16%, can be obtained if 2wt% polyvinyl alcohol is added. In addition,their pore shape, size and distribution are also satisfactory. After resintering, their density increasements are 0.22% TD and 0.3% TD respectively. The grain sizes are 14.3μm and 16.1μm respectively.

关 键 词：UO2 燃料 芯块 低密度 造孔剂 

分 类 号：TL352.21[核科学技术—核技术及应用]