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Characterization and Interpretation of the Aluminum Zone Refining through Infrared Thermographic Analysis

机译：红外热成像分析表征和解释铝区精炼

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摘要

High purity metals are nowadays increasingly in demand to serve in electronic, photovoltaic, and target materials industries. The zone refining process is the most common way to achieve high purity in the final step of metal purification. Zone length and crystal growth rate are the main parameters that control the zone refining process. To determine these values, information about temperature profiles in the molten zone is necessary due to its direct correlation with these values. As the determination of this profile is not practically achievable in the present, the novel approach of applying an infrared (IR) camera during the zone refining of 2N8 aluminum is the focus of the investigation in this work. The whole temperature profile of the region near the molten zone was recorded by IR camera during the entire running process. The zone length and the crystal growth rate at each thermographic image shooting moment were successfully extracted by thermographic analysis. Results showed that both factors varied significantly, which is in contrast to the assumption in literature about their stability while running under constant input power and heater movement velocity, though noticeable purification took place in all of these experiments. However, the impurity concentration during refinement fluctuated remarkably. This was well-demonstrated by the tendency of variation in crystal growth rate attained in this work. These results provide a better understanding of the mechanisms of zone refining with an inductive heater and contributes to the optimization of the process.
机译：如今，对高纯度金属的需求日益增长，可用于电子，光伏和靶材行业。区域精炼工艺是在金属纯化的最终步骤中获得高纯度的最常用方法。区域长度和晶体生长速率是控制区域精炼过程的主要参数。为了确定这些值，有关熔融区温度曲线的信息是必需的，因为它与这些值直接相关。由于目前无法确定此轮廓，因此在本工作中研究的重点是在2N8铝的区域细化过程中应用红外（IR）相机的新颖方法。在整个运行过程中，通过红外热像仪记录了熔融区附近区域的整个温度曲线。通过热成像分析成功地提取了每个热成像图像拍摄时刻的区域长度和晶体生长速率。结果表明，这两个因素均发生显着变化，这与文献中关于在恒定输入功率和加热器运动速度下运行时其稳定性的假设相反，尽管在所有这些实验中均进行了明显的纯化。然而，精制过程中的杂质浓度显着波动。通过这项工作获得的晶体生长速率变化趋势可以很好地证明这一点。这些结果使人们对使用感应加热器进行区域精炼的机理有了更好的了解，并有助于工艺的优化。

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