基于立体光刻的弥散型核燃料的制备

Fabrication of Dispersion Ceramic Nuclear Fuel by a Stereolithography-based Addictive Manufacturing Process

弥散型核燃料芯块中的核素分布强烈的影响反应堆的行为。本研究首次提出将立体光刻快速成型技术应用于氧化镁-氧化钚弥散型陶瓷核燃料的制备,显著地提高了核燃料微球在芯块中的分布均匀性。其中氧化镁作为基体起着结构材料作用,维持芯块的形状并提高核燃料芯块的导热率。文章详细探究了氧化镁粒径对浆料粘度、切片厚度,以及后处理过程对芯块的影响。最终芯块中的氧化镁弥散介质的密度达到3.15g/cm3(理论密度的88.1%)。最终芯块的剖面图表明核燃料微球在芯块中的分布高度均匀,本研究提供了一种制备核素分布高度均匀的弥散型核燃料芯块的新方法。

The distribution of nuclear particles in dispersion-type nuclear fuel pellets is a crucial property since it strongly influences in-pile fuel behaviors.In this study,the stereolithography-based addictive manufacturing(SLAM)was introduced to the fabrication of the MgO-PuO2 dispersion nuclear fuel pellets to ensure a highly uniform distribution of the nuclear fuel microspheres in the pellet.The MgO matrix acts as a structural material that holds pellets in their three-dimensional shape and improves the heat transfer performance of the nuclear fuel pellet due to its high thermal conductivity.A detailed technical route and fabrication processes was described in this research.The influence of the size of MgO particle on the viscosity of the slurry and the thickness of the single slurry layer and the effect of the post processing of green nuclear fuel pellets were also investigated.The density of MgO in final pellet achieves 3.15 g/cm3(88.1%of the theoretical density)and the micro structure of MgO inert matrix was studied by scanning electron microscope(SEM).The cross-sectional views of the final pellet appeared that the distributioe of nuclear fuel microspheres in the pellet was very homogenous.The researches presented provide a way of improving the distribution of the fissile elements in the dispersion-type nuclear fuel pellets.