中文摘要：

基于多元多相平衡原理,建立了氢气还原NbCl5和SnCl2蒸汽合成Nb3Sn超细粉末过程的热力学模型,使用FactSage软件计算了NbCl5,SnCl2的蒸发温度和载气Ar（g）用量,H2（g）用量和还原反应温度、收集温度等关键参数对反应产物的影响。计算结果给出了合成Nb3Sn（s）所需要的蒸发温度与载气使用量的组合、不同还原反应温度时99%转化率时所需要的最小H2（g）用量以及不同收集温度时最终固体产物中杂质的含量。

英文摘要：

Based on the principle of multi-component and multi-phase equilibrium principle, a thermodynamic model was developed for the synthesis of Nb3Sn powder by the method of hydrogen reduction of NbCl5 and SnCl2 vapors. The effects of the key parameters, such as evaporation temperatures of NbCl5, SnCl2, the amounts of the loading gases Ar and reducing gas H2,the reduction and collection temperatures, were investigated by means of the calculation with FactSage software. The calculated results demonstrated the optimized evaporation temperatures and loading gases amounts, the least amount of H2 for the 99% conversion rate of Nb3Sn, and the impurities in the final product at the different collection temperatures.