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铀锆合金熔炼中铀的挥发行为对控制合金成分及调控合金性能具有重要意义。应用热力学、动力学理论对金属铀及铀锆合金的挥发行为进行了研究,采用miedema模型对铀锆合金中铀活度系数进行了计算,并对不同温度、不同合金成分中铀的蒸气压、挥发速率变化规律进行了研究。结果表明,铀的挥发主要受熔炼温度及锆的含量影响。温度越高铀越易挥发,二者近似为指数关系,而锆合金含量越高,则铀越不易挥发,锆组元的加入有利于抑制铀的挥发损失。研究结果为后续工艺研究提供了参考依据。
The volatilization of uranium in uranium-zirconium alloy smelting plays an important role in controlling alloy composition and controlling the properties of alloy. The volatilization behavior of uranium metal and uranium-zirconium alloy was studied by thermodynamics and kinetic theory. The activity coefficient of uranium in uranium-zirconium alloy was calculated by miedema model. The effects of different temperatures, Volatilization rate was studied. The results show that the volatilization of uranium is mainly affected by the melting temperature and zirconium content. The higher the temperature, the more volatile uranium, the two approximate exponential relationship, and the higher the content of zirconium alloy, uranium is less volatile, the addition of zirconium components is conducive to inhibiting the loss of uranium volatilization. The research results provide reference for the subsequent technological research.