Sol-Gel法制备球形UO_2陶瓷颗粒  

Preparation of Spherical UO_2 Ceramic Particles by Sol-Gel Method

作　　者：卢振明[1] 符晓铭[1] 郭文利[1] 梁彤祥[1] 唐春和[1] 

机构地区：[1]清华大学核能与新能源技术研究院,新材料研究室,北京102201

出　　处：《无机材料学报》2007年第2期259-262,共4页Journal of Inorganic Materials

基　　金：国家"863"计划项目(863-614-02)

摘　　要：以U3O8粉末为原料,采用外凝胶与内凝胶结合的sol-gel法,经过溶解制胶、凝胶成球、陈化、洗涤干燥、煅烧、还原烧结、筛选得到球形UO2陶瓷颗粒．采用该方法制备的陶瓷颗粒为面心立方结构,密度为理论密度的98．18％;基本不含杂质, O／U比为2．00,平均标准偏差为0．001;平均直径为498．1μm,标准偏差为14．7μm;球形度分布在1．00～1．10区间,平均值为1．04;平均畸形比为2．2×10-4,各项指标都达到设计要求．同时,研究分析了各参数的影响．The spherical UO2 ceramic particles were prepared by a sol-gel method with U3O8 powders as raw material, which combines advantages of external gelation and internal gelation methods. The process includes steps of sol preparation, gel particles forming, aging, washing, drying, calcining, reducing, sintering, sieving and separating. The crystal form of the ceramic particle is face-centered cubic, and its density reaches 98.18% of the theoretical density value. All of the O/U ratio, diameter, sphericity and oddshaped particles fraction can reach the design specification. Influences of many factors are also analyzed.

关 键 词：溶胶-凝胶 球形陶瓷颗粒 二氧化铀 核燃料 

分 类 号：TB321[一般工业技术—材料科学与工程] TL352[核科学技术—核技术及应用]