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J. Korean Ceram. Soc. > Volume 42(9); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(9): 618.
doi: https://doi.org/10.4191/kcers.2005.42.9.618
Sol-Gel법을 이용한 구형 UO2 Kernel 제조에 관한 기초연구
김연구, 정경채, 오승철, 조문성, 나상호, 이영우, 장종화
한국원자력연구소 수소생산기술개발팀
A Basic Study on Spherical UO2 Kernel Preparation Using the Sol-Gel Method
Yeon-Ku Kim, Kyung-Chai Jeong, Seung-Chul Oh, Moon-Sung Cho, Sang-Ho Na, Young-Woo Lee, Jong-Wha Chang
Nuclear Hydrogen Production Technology Development Team, KAERI
ABSTRACT
HTGR (High Temperature Gas-Cooled Reactor) is highlighted to next generation power plant for producing the clean hydrogen gas. In this study, the spherical $UO_2$ kernel via $UO_3$ gel particles was prepared by the sol-gel process. Raw material of slightly Acid Deficient Uranyl Nitrate (ADUN) solution, which has pH = 1.10 and $[NO_3]/[U]$ mole ratio = 1.93, was obtained from dissolution of $U_3O_8$ powder with conc.-$HNO_3$. The surface of these spherical $UO_3$ gel particles, which was prepared from the broth solution, consisted of 1 M-uranium, 1 M-HMTA, and urea, were covered with the fine crystallite aggregates, and these particles were so hard that crushed well. But the other $UO_3$ gel particles prepared with the broth solution, consisted of 2 M-uranium, 2 M-HMTA, and urea, have soft surface characteristics and an amorphous phase. This type of $UO_3$ gel particles is some chance of doing possibility of high density from the compaction. The amorphous $UO_3$ gel particles was converted to $U_3O_8$ and then $UO_2$ by calcination at $600^{circ}C;in;4%;-;H_2;+;N2$ atmosphere.
Key words: Sol-Gel, Sphere
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