U-Mo/Nb扩散偶中扩散系数的测定

Measurement of Diffusion Coefficient in Diffusion Couple of U-Mo/Nb

摘要:

采用包覆热轧法制备了U-Mo/Nb固相复合扩散偶。分别在760和790 ℃下对U-Mo/Nb固相复合扩散偶进行了不同时间的扩散热处理。用能谱法(EDS)测定了扩散偶中主要元素在一维扩散方向上的分布；根据实验初边界条件建立了U-Mo/Nb的半无限长扩散偶模型，并用误差函数法获得了扩散方程的解析式。通过实验数据计算得到UMo合金中U元素在Nb基体中的扩散系数。结合实验方法分析认为计算结果基本合理

Abstract:

Solid bonding diffusion couples of U-Mo/Nb were prepared by coating and hot rolling. The diffusion couples were heat-treated at 760 oC and 790 oC for different time. The distribution of the main diffusion elements in linear dimension was measured by Energy Dispersive Spectrometer (EDS). The model of diffusion in semi-infinite media was established according to the experiment’s initial boundary conditions. Error function solutions of the diffusion equation were also presented. The diffusion coefficient of uranium diffused in Nb base metal was calculated with the experimental data. The calculation result is considered to be correct by analyzing the method of experiment