Abstract

Different stresses can occur in the carbon cathodes due to melting and penetration of sodium during aluminum electrolysis. Under high temperatures and elevated stress, carbon blocks experience primary creep, which can be extended to the secondary and tertiary creep stages. It is quite necessary to characterize the creep behavior of carbon cathodes. Therefore, uniaxial compressive creep testing devices have been used for measuring the creep strain of a semi-graphitic cathode material during aluminum electrolysis under various stress levels. The Graham creep equation is applied for the evaluation of the creep curves and the relationship between creep coefficient and stress is determined. The creep properties of carbon cathode are obtained via numerical simulation. The extracted model effectively supports the obtained experimental results. This work introduces a new insight into the development of cell design and quality control of carbon cathode materials.

中文翻译：

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铝电解中碳基正极材料蠕变应变的模拟

摘要

由于铝电解过程中钠的熔化和渗透，碳阴极中会出现不同的应力。在高温和高应力下，碳块经历了一次蠕变，可以扩展到二次蠕变和三次蠕变阶段。表征碳阴极的蠕变行为是非常必要的。因此，已经使用单轴压缩蠕变测试装置来测量在各种应力​​水平下铝电解期间半石墨阴极材料的蠕变应变。应用Graham蠕变方程评估蠕变曲线，并确定蠕变系数与应力之间的关系。碳阴极的蠕变性能是通过数值模拟获得的。提取的模型有效地支持了获得的实验结果。