细棒状铀-氢化锆燃料芯块制备与显微结构初步研究

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Preliminary Study on Manufacture Process and Microstructure of Thin Rod Uranium-Zirconium Hydride Fuel Pellets

National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 采用熔炼铀-锆合金然后渗氢的工艺制造细棒状铀-氢化锆燃料芯块,通过改变熔炼工艺参数提高铀-锆合金的铸造质量和成品率。在渗氢的工艺中,采用不同工艺对铀-锆合金进行氢化,氢化后芯块中的氢/锆原子比在1.41～1.72之间,而芯块的尺寸相对于氢化前也有不同程度的增加。微观分析表明,氢化后得到的燃料芯块中含有多种相结构,其中金属铀比较均匀地弥散在氢化锆基体中,燃料芯块的氢分布出现边缘高中心低的特征。
- 铀-氢化锆燃料 /
- 制造工艺 /
- 显微组织 /
- 细棒
Abstract: Uranium-zirconium hydride fuel pellets were manufactured by the method of melting and casting U-Zr alloys and then hydrogenating the U-Zr alloys.The casting quality and yield were improved by changing the parameters of melting and casting process.U-Zr alloys were hydrogenated by using different parameters.The H/Zr atomic ratio of uranium-zirconium hydride fuel pellets was ranged from 1.41 to 1.71.The size of specimens was increased after hydrogenation process.The fuel pellet was composited by several phases,and uranium was present as metallic inclusions in a matrix of zirconium hydride.In addition,the concentration of hydrogen at fuel pellet brim was higher than that at fuel pellet center.
- Uranium-zirconium hydride fuel /
- Manufacture process /
- Microstructure /
- Thin rod