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基于固-气共晶定向凝固技术和单相合金的定向凝固原理,提出一种测定氢在金属熔体中扩散系数的方法。以Cu-H2系为例,研究氩气分压和熔体过热度对氢在金属熔体中熔点处扩散系数的影响。结果显示,不同工艺参数条件下所获得的扩散系数差别很小,且采用该方法获得的氢在金属Cu熔体中温度相关的扩散系数方程与文献中采用实验方法获得的结果吻合得较好,并验证了该方法的可行性。除Cu-H2系外,还计算了氢在金属Mg、Si以及Cu-34.6%Mn合金熔点温度熔体中的扩散系数值以及温度相关的扩散系数方程。
Based on the solid-gas eutectic directional solidification technique and the directional solidification principle of single-phase alloy, a method for determining the diffusion coefficient of hydrogen in a metal melt is proposed. Taking Cu-H2 as an example, the influence of partial pressure of argon and superheat on the diffusion coefficient of hydrogen at the melting point of metal melt was studied. The results show that the diffusion coefficient obtained under different process parameters is very small, and the temperature-dependent diffusion coefficient equation of hydrogen obtained by this method is in good agreement with the experimental results obtained in literature. And verified the feasibility of the method. In addition to the Cu-H2 system, the diffusion coefficient values and temperature-dependent diffusion coefficient equations for hydrogen in the melting temperatures of metallic Mg, Si and Cu-34.6% Mn alloys were also calculated.