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传统上,铝、稀土和碱金属及碱土金属等活泼金属主要是通过高温熔盐电解法得到,其电解工艺流程能耗高.近几年来,对离子液体的不断深入研究,提出离子液体为电解质体系用于金属铝、铝精炼和铝合金.综述目前采用离子液体体系进行铝及铝合金电沉积,粗铝、铝合金和铝基复合材料电解精炼回收铝的研究现状和研究进展.介绍和评述离子液体电解质电沉积、精炼铝的应用情况和所取得的研究成果,探讨离子液体电解质用于铝行业的发展趋势和研究动向. 相似文献
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采用铝热还原—真空电磁悬浮熔炼法,对废弃的选择性催化还原(SCR)钛基脱硝催化剂制备Ti-Al基金属间化合物进行了试验研究。通过SEM和XRD分析,发现合金中所观察到的相主要由TiAl_2,Ti_5Si_3和TiAl相组成,而杂质相主要以氧化物和碳化物的形式存在。随着合金的精炼,钛铝化合物的组成由富钛钛铝化合物相转变为富铝钛铝化合物相,杂质含量逐渐减少,三次精炼后的总杂质去除率可达85%以上。硬度测试表明,随着精炼次数增加,硬度呈上升趋势。这是由于高硬度的TiAl_2相增加和低硬度的TiAl相减少所导致的。 相似文献
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文章主要阐述了镍铁精炼的工艺流程以及镍铁精炼化学升温过程中,当达到目标温度时,镍铁成分的变化、铝的加入量与吨镍铁温升的关系、吹氧强度与温升的关系以及镍铁中碳含量与加铝量的关系。在镍铁精炼工艺中,首次使用了铝作为发热剂补偿镍铁精炼过程中的温度损失。实践表明,镍铁精炼过程采用铝升温技术,升温的速度和幅度都超出设计值,也突破了钢铁行业对于铝升温技术的原有认识。 相似文献
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以V2O5和Al粉为原料,利用自制竖炉在实验室条件下进行铝热法制备电解精炼用粗钒合金试验,研究了单位炉料热量和配铝系数对V回收率和合金中Al含量的影响。稳定性试验结果表明:单位炉料热量为4 080 kJ/kg、配铝系数为100%的条件下,得到的粗钒合金平均含V 92.65%,Al 2.79%,过程中钒回收率平均为84.34%,该种合金可用于电解精炼制备金属钒。 相似文献
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The process of plane stress local torsion (PSLT) has been recently proposed as localized severe plastic deformation to enhance the mechanical properties of the fastener holes. The PSLT process can create large shear strains and, consequently, substantial grain refinement in the vicinity of the hole with a gradient in the radial direction. It is of great interest and importance to investigate the effect of the PSLT process on a range of materials commonly used in the industry. An introductory investigation of mechanical and microstructural properties of Al6061 samples processed by the PSLT is performed in this work. The PSLT is simulated using the finite-element method, and the torque twist curves obtained from finite-element simulations are compared with experimental measurements. Microstructural changes and the extent of grain refinement are investigated by means of optical microscopy. It is shown that the PSLT is responsible for a considerable improvement in the mechanical properties within the deformation zone. The microhardness tests were used to measure the degree of enhancement in ultimate and yield strengths of the material processed by the PSLT. 相似文献
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本文介绍了铝合金消除残余应力的深冷处理技术,分析了深冷处理过程的应力状态,给出了残余应力消除的机理是应力反转、晶粒细化和原子间的动能转移。 相似文献
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分析了再生铝合金熔炼过程中环境影响因素及工艺技术特点,引导企业结合自身的生产实际,因地制宜,制定出适合本企业实际的工艺技术操作方法。 相似文献
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X. Zhou Y. Liu G. E. Thompson G. M. Scamans P. Skeldon J. A. Hunter 《Metallurgical and Materials Transactions A》2011,42(5):1373-1385
Near-surface deformed layers, which are characterized by nano-sized fine grains, are generated in aluminum alloys by hot and
cold rolling. During the rolling processes, the alloy surface and near-surface regions experience a high level of shear deformation
that results in significant microstructure refinement, leading to formation of near-surface deformed layers with microstructures
different from that of the underlying bulk alloy. Two types of near-surface deformed layers are observed. Type A is characterized
by fine grains with grain boundaries decorated by oxide particles; type B is characterized also by fine grains but with the
grain boundaries free of oxide particles. The high levels of shear deformation result in dynamic recrystallization. Together
with mechanical alloying, this is responsible for the formation of the near-surface deformed layer. Furthermore, the structure
in the near-surface deformed layer can survive the typical annealing process particularly if the grain boundaries are pinned
by oxide particles. 相似文献
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