溶胶凝胶法制备铝硅酸锂氚增殖陶瓷粉体

Fabrication of Lithium Aluminosilicate Tritium Breeder Ceramic Powder by Sol-gel Process

铝硅酸锂(Li_(9)AlSiO_(8))陶瓷材料可以结合偏铝酸锂(LiAlO_(2))和正硅酸锂(Li_(4)SiO_(4))的优点,显著提升锂含量、热导率和机械性能,获得较高的氚增殖率、释氚能力和球床稳定性。制备Li_(9)AlSiO_(8)采用溶胶凝胶法,通过水解和缩合反应获得凝胶,再通过高温烧结获得陶瓷粉体。通过热重-差示扫描量热分析确定干凝胶的预分解温度和产物的烧结温度。对烧结的产物粉体进行X射线衍射和扫描电子显微镜分析,获得产物的晶相、晶格常数和粒径等,进而计算得到材料锂含量。

Lithium aluminosilicate(Li_(9)AlSiO_(8))ceramic material can combine the advantages of lithium metaaluminate(LiAlO_(2))and lithium orthosilicate(Li_(4)SiO_(4)),significantly increase lithium content,thermal conductivity and mechanical properties,and obtain higher tritium breeder rate and tritium release capacity and stability of the pebble bed.The preparation of Li_(9)AlSiO_(8) adopted the sol-gel process,through hydrolysis and condensation reaction,and then obtained ceramic powder through high temperature sintering.Through thermogravimetric-differential scanning calorimetry analysis,the pre-decomposition temperature of the xerogel and the sintering temperature of the product were determined.The sintered product powder was analyzed by X-ray diffraction and scanning electron microscope to obtain the crystal phase,lattice constant and particle size of the product,and then calculate the lithium content of the material.