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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication and Characterization of Nickel Ferrite Based Inert Anodes for Aluminum Electrolysis
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Fabrication and Characterization of Nickel Ferrite Based Inert Anodes for Aluminum Electrolysis

机译：铝电解镍铁氧体惰性阳极的制备与表征

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摘要

Nickel ferrite-based cermets and their relevant composites have been widely used as inert anodes for aluminum electrolysis due to the good combination of chemical resistance, thermal, and mechanical stability. In this study, various NiO/NiFe_2O_4 composites consisting 5, 10, and 15% NiO in conjunction with Cu/NiFe_2O_4 cermets containing 5, 10, and 15% Cu have been prepared by powder metallurgy method. The degradation resistance of developed inert composites has been evaluated under hot corrosion conditions by plunging the samples in the molten electrolyte at 1,000℃ for various holding times. The strength, toughness, hardness, relative density, microstructural observation, phase analysis, and electrical resistivity have been investigated in details by the 3-points bending test, Vickers hardness test, Archimedes method, scanning electron microscope, x-ray diffraction, and conventional direct current four-probe technique, respectively. The experimental results for NiO/NiFe_2O_4 composites show that a significant improvement of toughness and degradation resistance occurred in conjunction with a moderate decrease in strength by adding NiO content from 5 to 15%, while the relative density has been increased only up to 5%NiO content and then decreased. Moreover, increasing of Cu content from 5 to 15% in the cermet samples, all of the mentioned engineering properties such as strength, toughness and electrical conductivity have been improved considerably, but the degradation resistance has been decreased.
机译：基于镍铁氧体的金属陶瓷及其相关的复合材料由于耐化学性，热稳定性和机械稳定性的良好结合而被广泛用作铝电解的惰性阳极。在这项研究中，通过粉末冶金方法制备了各种NiO / NiFe_2O_4复合材料，包括5％，10％和15％的NiO，以及含5％，10％和15％Cu的Cu / NiFe_2O_4金属陶瓷。已开发的惰性复合材料的抗降解性已在热腐蚀条件下进行了评估，方法是将样品在1000℃的熔融电解质中浸泡不同的保持时间。通过三点弯曲试验，维氏硬度试验，阿基米德法，扫描电子显微镜，X射线衍射和常规方法，详细研究了强度，韧性，硬度，相对密度，显微组织观察，相分析和电阻率。直流四探针技术。 NiO / NiFe_2O_4复合材料的实验结果表明，通过增加NiO含量（从5％到15％），强度和适度降低会显着提高韧性和抗降解性，而相对密度仅增加到5％NiO。含量然后下降。此外，金属陶瓷样品中的Cu含量从5％增加到15％，所有提及的工程性能，例如强度，韧性和电导率都得到了显着改善，但抗降解性却降低了。

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