铝热还原工艺条件对Al-Ti-Ce中间合金物相结构和合金元素浓度的影响  

Effect of Aluminothermic Reduction Conditions on the Phase Structure and Chemical Composition of Al-Ti-Ce Master Alloy

作　　者：李森 高锋 沈东东 龙文元 李新生 王开拓 王友彬 藤田丰久 韦悦周 Li Sen;Gao Feng;Shen Dongdong;Long Wenyuan;Li Xinsheng;Wang Kaituo;Wang Youbin;Toyohisa Fujita;Wei Yuezhou(Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials,Nanning 530004,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]广西有色金属及特色材料加工重点实验室,广西南宁530004 [2]广西大学资源环境与材料学院,广西南宁530004

出　　处：《稀有金属材料与工程》2022年第5期1805-1812,共8页Rare Metal Materials and Engineering

基　　金：广西创新驱动重大专项(AA18118030);广西自然科学基金(2019GXNSFAA185013,2017GXNSFAA198206)。

摘　　要：在Na_(3)AlF_(6)-NaCl-KCl氟氯混合电解质体系中,通过铝热还原法以TiO_(2)和CeO_(2)为Ti源和Ce源,制备Al-Ti-Ce中间合金。研究反应时间、反应温度、电解质构成(Na_(3)AlF_(6)含量)、K_(2)TiF_(6)添加量4种工艺条件对Al-Ti-Ce中间合金物相结构和合金元素浓度的影响。结果表明,在所有实验工艺参数范围内,制备的Al-Ti-Ce中间合金均由α-Al、Al_(3)Ti和Ti_(2)Al_(20)Ce三相构成。制备的最佳单因素工艺参数为:反应时间90 min,反应温度850℃,Na_(3)AlF_(6)质量分数40%、K_(2)TiF_(6)添加量20mol%。热力学分析结果从理论上进一步证明了在实验条件下几种主要化学反应的可行性。Al-Ti-Ce master alloy was prepared by aluminothermic reduction of TiO_(2) and CeO_(2) in Na_(3)AlF_(6)-NaCl-KCl electrolytic system.The effects of reaction time,reaction temperature,electrolytic composition(mass fraction of Na_(3)AlF_(6))and K_(2)TiF_(6) dosage on the phase structure and chemical composition of Al-Ti-Ce master alloy were studied.The experimental results show that there are only three phases in the Al-Ti-Ce master alloy,which areα-Al,Al_(3)Ti and Ti_(2)Al_(20)Ce,at the range of process parameters used in each experiment,and the optimal single-factor parameters in preparing Al-Ti-Ce master alloy by aluminothermic reduction are as follows:reaction time 90 min,reaction temperature 850℃,content of Na_(3)AlF_(6)40wt%,K_(2)TiF_(6) dosage 20mol%.The results of thermodynamic analysis further show that the main several chemical reactions proposed in this study are feasible on the checked experimental conditions.

关 键 词：Na_(3)AlF_(6)-NaCl-KCl电解质体系 铝热还原 Al-Ti-Ce中间合金 物相结构 化学成分 

分 类 号：TG146.21[一般工业技术—材料科学与工程]