Mechanisms and Process Model of Ultra-Refining of Metals by Crystallization via a rotating cooled cylinder

旋转冷却筒结晶超精炼金属的机理和过程模型

• 批准号: 421743304
• 负责人: Dr. Markus Apel
• 金额: --
• 依托单位: Access e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/421743304?language=en
• 关键词: Mechanisms; Process; Model; Ultra; Refining

The project aims to explore an alternative method for the synthesis of pure metals. The core element is fractional crystallization, which is to be conducted through an internally cooled rotating crystallizer (in short named "cooled finger"), on which the ultra-pure metal from a contaminated melt grows. This method has in the case of success the potential to replace the current zone melting process. However, the understanding of an effective application of this method, particularly the process controlling parameters as well as a description of the mechanisms in the process, is currently lacking. By interplay of thermophysical computations and solidification simulation on a macroscopic process and microscopic microstructure scale, the demixing processes at the progressive phase boundary are to be quantitatively described and correlated with process parameters. Extensive DoE-supported experimental investigations to verify and validate numerical predictions are performed on aluminum. Aluminum has been chosen here as the model metal due to the existance of the required thermodynamic and physical data for the simulation that allowing a quantitative study of the fundamental principles and dominant process parameters for the cold finger method. Aluminum is cost-effective in various purities, which means a significant reduction in research costs. The project results are aimed at process windows for efficient cleaning and the associated parameters and process models for controlling the solidification front dynamics. The cooperation of three working groups with different research interests aims to provide a quantitative understanding of the potential of this - so far - unexplored crystallization process. The physically-based simulation model will facilitate simplified transfer to other alloying systems.

该项目旨在探索纯金属合成的另一种方法。核心元素是分数结晶，可以通过内部冷却的旋转结晶器（简称为“冷却手指”）进行，从而在其上生长了超色的金属。在成功的情况下，该方法具有替换当前区域熔化过程的潜力。但是，目前缺乏对这种方法的有效应用的理解，尤其是过程控制参数以及对过程中机制的描述。通过在宏观过程和微观微观结构量表上的热物理计算和固化模拟的相互作用，应定量描述渐进相边界处的分解过程并与过程参数相关。在铝上进行了广泛的DOE支持实验研究以验证和验证数值预测。由于存在模拟所需的热力学和物理数据，因此在这里选择了铝作为模型金属，从而允许对冷手指方法的基本原理和主要过程参数进行定量研究。铝在各种纯度上具有成本效益，这意味着研究成本大大降低。该项目结果针对的是处理窗口的有效清洁以及相关的参数和用于控制固化前部动态的过程模型。具有不同研究兴趣的三个工作组的合作旨在提供对这一潜力的定量理解 - 到目前为止 - 未开发的结晶过程。基于物理的仿真模型将有助于简化转移到其他合金系统。