固态氚增殖材料新型孔道结构设计及释氚性能改善机理研究

聚变堆燃料循环中的关键问题之一就是氚的获得，因此，聚变堆氚增殖包层设计已成为参与聚变能研发的世界各国竞争的核心技术，用于产氚的新型结构锂基陶瓷的开发对于我国聚变能源的发展具有重要意义。本项目针对目前固态氚增殖剂陶瓷材料孔结构和氚释放性能改善途径缺乏的瓶颈问题，拟采用定向梯度冷冻干燥法和光固化3D打印成型技术制备Li2TiO3、Li4SiO4、复相Li2TiO3-Li4SiO4氚增殖剂陶瓷微球和三维有序孔道结构陶瓷块体材料，系统研究孔道结构设计（径向孔、直通孔和三维有序孔）、制备工艺参数包括陶瓷浆料配比、冷冻梯度分布及速率、光固化时间及精度等对氚增殖陶瓷材料孔道结构调控的影响及机理，揭示孔结构和孔道结构对材料热机械性能和氚释放与传输行为的影响，获得通过孔道结构调控改善氚增殖材料性能的有效途径，为探索和开发出具有自主知识产权的新型结构固态氚增殖陶瓷材料提供技术支撑。

The key issue of fuel cycle in fusion reactor is obtaining of tritium, So the design of tritium producing blanket in fusion reactor has been become the key technology that all country competed in the world. and the exploitation of blanket materials with new structure is very important for developing fusion energy of our country. In view of the bottleneck issue in improving of properties of tritium release and pore structure, the ceramic pebbles of Li2TiO3、Li4SiO4 and Li2TiO3-Li4SiO4, and the bulk ceramics with 3D ordered pore canal will be prepared by gradient freeze casting method and stereo lithography technique in this project. The mechanism of pore canal structure design (radial pore, straight-through proe and 3D ordered pore), preparation possessing parameters ( ratio of ceramic slurry, freeze gradient distribution and rate, photocuring time and accuracy) on controlling of pore structure for ceramics pebbles will be systematically investigated. The effects of pore structure on the properties of thermal mechanical and tritium release and transmission will be studied, and the efficient path of improving properties of ceramic pebbles will be illustrated by controlling the pore structure. Finally, this project will provide technical support for developing the ceramic pebbles with new structure.