制备致密UO_2核燃料芯核的外胶凝方法(Ⅱ)

PREPARATION OF DENSE UO_2 FUEL KERNELS BY EXTERNAL GELATION PROCESS (Ⅱ)

文章研究了用凝胶-支撑沉淀法制备密实UO_2包复颗粒芯核的干燥、煅烧和还原烧结三个阶段操作,分析了干燥方法、煅烧温度、中间产物的氧铀比、还原烧结温度以及升温速度对最终产品的影响,确定了UO_2致密化过程的最佳参数。小球密度达理论密度95%以上。

Three steps, the drying, calcining and reducing-sintering of wet gel spheresin heat-treatment of gel-supported process for preparing dense UO_2 microspheresare studied. The influences of the ways of drying, temperature of calcination,O/U ratio of the intermediate products, temperature of reducing-sintering, andthe rate of temperature elevation on the end-products are analysed. The parame-ters for UO_2 microspheres densification are optimized. The density of UO_2 micro-spheres is upto 95% T. D.