Li4TixSi1-xO4氚增殖陶瓷制备及力学性能

正硅酸锂材料锂密度高、释氚性能好,是国际热核聚变实验堆(ITER)主要的候选氚增殖剂材料.通过异质元素掺杂,形成固溶体结构,可提高陶瓷抗压强度.本研究采用固相法合成陶瓷粉体,通过熔融喷雾工艺制备获得密度高、球形度好的Li4 Tix Si1-x O4固溶体陶瓷小球.Ti原子固溶可以改善陶瓷微观结构,提升力学性能.研究结果...

Fabrication and Mechanical Property of Li4TixSi1-xO4 Ceramic Tritium Breeders

Lithium orthosilicate(Li₄SiO₄) is considered as the promising ceramic tritium breeder materials for the International Thermonuclear Experimental Reactor(ITER) due to its high lithium density and good tritium release property. The mechanical property of the ceramic breeder material will be improved by hetero-element doping and forming solid solution. In this study, Li₄Ti_xSi_1-xO₄ pebbles with high density and good sphericity were fabricated by melt spraying method with the powders synthesized by solid state reaction. The microstructure of the pebbles was improved by doping Ti, thus increasing the crush load. The results indicate that the crush load of Li₄SiO₄ pebbles is decreased with the increasing of temperatures, the crush load is only 10.2 N for the pebble annealed 2 h at 800 ℃. Compared to Li₄SiO₄ pebbles, the mechanical property of Li₄Ti_0.1Si_0.9O4 is significantly improved, and the crush load is as high as 26.2 N annealed 2 h at 800 ℃. Besides, the Li₄Ti_0.1Si_0.9O4 pebbles also show considerable stability.