Preliminary study on the development of the fluidic system for the fabrication of pebble with core-shell structure

초록

Li4SiO4, used as a tritium breeder material in fusion reactors, has high lithium density but suffers from lower mechanical strength compared to another promising material, Li2TiO3. In this study, a fluidic system was designed to fabricate core-shell structured pebbles (Li4SiO4-Li2TiO3) consisting of a Li4SiO4 core and a Li2TiO3 shell. The system was constructed using a T-shaped fluid flow channel with a double-tube design, enabling the controlled formation of core-shell droplets by adjusting the flow rates of the continuous and dispersed phases. The resulting Li4SiO4-Li2TiO3 pebbles exhibited a crush load approximately 2.03 times higher than that of singlephase Li4SiO4 pebbles, and the stable formation of the core-shell structure was confirmed. This study presents a novel fabrication process with the potential to enhance the mechanical performance of Li4SiO4 as a tritium breeder material.

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