3D打印制备核素分布高度均匀的弥散型陶瓷核燃料芯块

Fabrication of dispersion ceramic nuclear fuel pellets with a highly uniform distribution of nuclide by 3D printing

核燃料微球在弥散型核燃料芯块中的分布均匀性对核燃料芯块的性能影响很大,是高性能核燃料的重要参数之一.提出了一种提高可裂变核素在芯块中分布均匀性的弥散型核燃料制备方法.首次提出将基于选择性激光烧结技术(selective laser sintering,SLS)的3D打印技术应用于弥散型陶瓷核燃料的制备,显著提高了核燃料微球在惰性弥散介质中的分布均匀性.详细描述了双组分陶瓷材料的3D打印技术路线的实现,并对惰性介质氧化镁的粒径、激光扫描参数和后处理过程与燃料芯块性能间的关系开展了研究.研究制备的核燃料芯块的截面图表明核燃料微球在芯块中的分布高度均匀.

The distribution of nuclear particles in dispersion-type nuclear fuel pellets is a crucial property since it strongly influences in-pile fuel behaviors.A way of improving the distribution of the fissile elements in the dispersion-type nuclear fuel pellets was presented.In this study,the selective laser sintering(SLS)was introduced to the fabrication of the dispersion nuclear fuel pellets to ensure a highly uniform distribution of the nuclear fuel microspheres in the pellet.A detailed technical route and fabrication processes was described.The effect of the size of MgO particle,scanning parameters and the post-processing of green nuclear fuel pellets were also investigated.The cross-sectional views of the final pellet showed that the distribution of nuclear fuel microspheres in the pellet was very homogeneity.