快堆燃料芯块压制成型技术研究

本文采用双向压制的方法制备MOX燃料芯块生坯，通过一系列实验，对压制压力、保压时间和成型剂添加量对燃料芯块生坯和烧结芯块性能的影响进行了研究，得到一套快堆燃料芯块压制成型的工艺技术参数：压制压力400 MPa、保压时间2 s、硬脂酸锌添加量0.4%（质量分数）。验证实验结果表明，采用上述工艺参数制出的生坯质量良好，烧结得到的芯块微观组织均匀、无宏观及微观缺陷，可用于快堆燃料芯块的制造，同时对其他类型燃料元件芯块制造有较好的参考作用。

Study of Pressing Molding Technology for Fast Reactor Fuel Pellet

MOX fuel pellets were prepared by bidirectional pressing. Through a series of experiments, the influence of pressing pressure, dwell time and addition amount of lubricants on the performance of fuel pellets was studied. A set of pressing technological parameters of fast reactor fuel pellet were obtained. The pressing pressure is 400 MPa, the dwell time is 2 s, and the content of zinc stearate is 0.4%. The results of the verification test show that the green billet made by the above process parameters is of good quality. The microstructure of the sintered pellets is uniform and there are no macro and micro defects, and the sintered pellets can be used in the manufacture of fuel pellets in fast reactor, and can be used as a reference for the manufacture of other types of fuel element pellets.