An improved internal gelation process without cooling the solution for preparing uranium dioxide ceramic microspheres
An improved internal gelation process without cooling the solution for preparing uranium dioxide ceramic microspheres
复制标题
一种改进的无需冷却溶液的内凝胶法制备二氧化铀陶瓷微球的方法
DOI：
10.1016/j.ceramint.2017.11.001
复制
发表时间：
2018-02-01
影响因子：
5.2
通讯作者：
Qin, Zhi
中科院分区：
文献类型：
--
作者：
Li, So;Bai, Jing;Qin, Zhi
描述了一种改进的内部凝胶化工艺，用于制备直径为 790 +/- 20 pm 的 UO2 陶瓷微球。 UO2 陶瓷微球是通过优化烧结和煅烧步骤中的原料溶液组成和加热速率来制备的。将两种进料溶液六亚甲基四胺(HMTA)-尿素和UO22+在液滴形成之前混合，在室温下通过两次液相色谱驱动，无需冷却溶液。采用1.45的尿素/UO22+摩尔比以确保溶液的稳定性。经过精确的洗涤步骤，去除杂质后，在烧结和煅烧过程中，升温速率为5K/min，即可得到球形良好、裂纹少的UO2陶瓷微球。与之前报道的传统方法不同，本文改进过程中采用了不冷却的溶液。
An improved internal gelation process for the preparation of UO2 ceramic microspheres with diameter of 790 +/- 20 pm is described. The UO2 ceramic microspheres are prepared by optimizing feed solution compositions and heating up rate during sintering and calcination steps. The two feed solutions Hexamethylenetetramine (HMTA)-urea and UO22+ were mixed just before the drop formation driven by two liquid chromatography at room temperature without Cooling the Solution. A urea/UO22+ mole ratio of 1.45 is applied to ensure the stability of the solution. After accurate washing steps to wipe out the impurities, good spherical and little cracked UO2 ceramic microspheres will be obtained at a heating-up rate of 5 K/min during sintering and calcination. Different from the traditional methods reported previously, solution which is not cooled is employed during the improved process in this paper.