KF-AlF_3-Sc_2O_3熔盐体系下沉阴极法制备Al-Sc合金的实验研究  

Experimental Study on Preparation of Al-Sc Alloy with Sinking Cathode in KF-AlF_3-Sc_2O_3 Molten Salt System

作　　者：向燕 郑鑫 张蔚 曾文华 刘红霞 张小联 XIANG Yan;ZHENG Xin;ZHANG Wei;ZENG Wen-huat;LIU Hong-xia;ZHANG Xiao-lian(School of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341100, China;Ganzhou Feiteng Light Alloy Co. ,Ganzhou 341000,China)

机构地区：[1]赣南师范大学化学化工学院,江西赣州341100 [2]赣州飞腾轻合金有限公司,江西赣州341000

出　　处：《稀有金属与硬质合金》2018年第2期37-41,共5页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51464002)

摘　　要：在KF-AlF_3-Sc_2O_3熔盐体系中,研究下沉阴极法制备Al-Sc合金的工艺技术。采用XRD、SEM分析了所制备Al-Sc合金的物相组成、微观组织以及微区成分含量;研究了电解温度、阴极电流密度、熔盐组成对熔盐电解电流效率的影响。实验结果表明,Al-Sc合金中含有Al相、Sc相以及Al_3Sc相;Al-Sc合金夹杂了少量熔盐,Al_3Sc相在合金中的分布和形态呈不规则状。电解过程的最佳工艺条件为:在KF-AlF_3-Sc_2O_3熔盐体系中,液态铝为下沉阴极,Sc_2O_3为电解质,熔盐体系KF/AlF_3摩尔比1.3,电解温度800℃,电解时间25min,电流密度1.592A/cm^2;此条件下所制备Al-Sc合金中Sc含量最高可达6.710%,平均电流效率达到57.28%。The preparation process of Al-Sc alloy with sinking cathode in KF-AlF3-Sc2O3 molten salt system was studied. The phase composition, microstructure and micro area composition of AI-Sc alloy were analyzed by XRD and SEM. The effects were investigated of electrolysis temperature,cathode current density and molten salt proportion on electrolysis current efficiency. The experimental results show that Al-Sc alloy is composed of Al phase, Sc phase and Al3 Sc phase, and the alloy is mixed with a small amount of mol- ten salt. The distribution and morphology of Al3 Sc phase are irregular in the alloy. The optimal electrolysis process conditions are as follows：in KF-AlF3-Sc2O3 molten salt, liquid aluminum is the sinking cathode, and Sc203 is the electrolyte, with KF/AlF3 molar ratio in the molten salt of 1.3,electrolysis temperature of 800 ℃ ,electrolysis time of 25 min,and current density of 1. 592 A/cm^2. Under the above conditions,Sc content in the Al-Sc alloy is up to 6. 710% and the average current efficiency reaches 57.28%.

关 键 词：AL-SC合金 熔盐电解 液态阴极电解法 下沉阴极 KF-AlF3-Sc2O3 电流效率 

分 类 号：TG146.451[一般工业技术—材料科学与工程]