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Composition and structure of Ti–Al alloy powders formed by electrochemical co-deposition in KCl–LiCl–MgCl2–TiCl3–AlCl3 molten salt
Intermetallics ( IF 4.4 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.intermet.2021.107341
Fuxing Zhua 1, 2 , Kaihua Li 2, 3 , Wenchen Song 4 , Liang Li 2 , Dafu Zhang 1, 2 , Kehui Qiu 1
Affiliation  

Direct electrochemical deposition from titanium and aluminum chlorides is a green and short process for preparing Ti–Al alloy powders, thereby relevant for replacing the conventional smelting process characterized by intermittent and high production costs. However, the morphologies and compositions of resulting Ti–Al alloy powders have not yet been systematically studied. Here, Ti–Al alloy powders with different compositions and morphologies were successfully prepared from a molten KCl–LiCl–MgCl2 salt containing AlCl3 and TiCl3 under different electrodeposition parameters. The electrochemical behaviors of Ti and Al ions were examined on Mo and Al working electrodes by cyclic voltammetry at different temperatures. The results revealed variable numbers of redox peaks with temperature and working electrode material. The influences of the cathodic parameters on compositions and morphologies of Ti–Al alloy products studied through potentiostatic and galvanostatic electrolysis revealed that factors like cathodic potentials, initial current densities, and mole ratios of TiCl3/AlCl3 greatly influenced the chemical compositions of Ti–Al alloy products except for temperatures. Also, phase compositions of Ti–Al alloy products were mainly controlled by the electrodeposition potentials and mole ratios of TiCl3/AlCl3. Meanwhile, the morphologies and particle sizes of Ti–Al alloy powders varied with temperature, current density, and electrolyte composition. In sum, these findings look promising for future formation of Ti–Al alloy powders for various uses.



中文翻译:

在KCl-LiCl-MgCl2-TiCl3-AlCl3熔盐中电化学共沉积形成的Ti-Al合金粉末的组成和结构

钛和氯化铝的直接电化学沉积是制备 Ti-Al 合金粉末的绿色短流程,可替代具有间歇性和高生产成本的传统冶炼工艺。然而,尚未系统地研究所得 Ti-Al 合金粉末的形态和成分。在这里,从含有 AlCl 3和 TiCl 3的熔融 KCl-LiCl-MgCl 2盐中成功制备了具有不同成分和形貌的 Ti-Al 合金粉末在不同的电沉积参数下。通过循环伏安法在不同温度下检测了 Ti 和 Al 离子在 Mo 和 Al 工作电极上的电化学行为。结果显示氧化还原峰的数量随温度和工作电极材料而变化。通过恒电位和恒电流电解研究阴极参数对Ti-Al合金产品成分和形貌的影响表明,阴极电位、初始电流密度和TiCl 3 /AlCl 3摩尔比等因素对Ti-Al合金的化学成分有很大影响。铝合金产品,温度除外。此外,Ti-Al 合金产品的相组成主要受电沉积电位和 TiCl 的摩尔比控制3 /AlCl 3。同时,Ti-Al 合金粉末的形貌和粒径随温度、电流密度和电解质组成而变化。总之,这些发现对于未来形成各种用途的 Ti-Al 合金粉末很有希望。

更新日期:2021-09-20
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