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J. Korean Ceram. Soc. > Volume 50(5); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(5): 333.
doi: https://doi.org/10.4191/kcers.2013.50.5.333
리튬용액 침투방법에 의한 Li2TiO3 페블 제조
유민우, 박이현1, 이상진
국립목포대학교 신소재공학과
1국가핵융합연구소
Fabrication of Li2TiO3 Pebbles by Lithium Solution Penetration Method
Min-Woo Yu, Yi-Hyun Park1, Sang-Jin Lee
Department of Advanced Materials Science & Engineering, Mokpo National University
1National Fusion Research Institute
ABSTRACT
To fabricate spherical lithium titanate ($Li_2TiO_3$) pebbles which are used for a breeder material in fusion reactor, titanium oxide ($TiO_2$) granules were used as a starting material. The granules were pre-sintered, and then aqueous lithium nitrate solution infiltrated into the granules at vacuum condition. The granules were crystallized to $Li_2TiO_3$ after sintering under the control of process parameters. In this study, the concentration of lithium in the solution, as well as the number of penetration times and sintering temperature affected the final crystallite phase and the microstructure of the pebbles. In particular, the sphericity and size of the pebbles were effectively controlled by a technical rolling process. The useful spherical $Li_2TiO_3$ pebbles which have 10~20% porosity and 60~120 N compressive strength were obtained through the sintering at $1000{sim}1100^{circ}C$ in the multi-times infiltration process with 50 wt% solution. The physical properties of pebbles such as density, porosity and strength, can be controlled by a selection of $TiO_2$ powders and control of processing parameters. It can be thought that the lithium penetration method is a useful method for the fabrication of mass product of spherical $Li_2TiO_3$ pebbles.
Key words: $Li_2TiO_3$ Pebble, Lithium solution, Penetration method, Breeder material, Granules
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