Preparation of Al-Hf master alloy by aluminothermic reduction of HfO_(2)

作     者：Hai Liu Zhao-Hui Ma Jing-Cun Huang Jian-Dong Zhang Guo-Qing Yan Li-Jun Wang Hai Liu;Zhao-Hui Ma;Jing-Cun Huang;Jian-Dong Zhang;Guo-Qing Yan;Li-Jun Wang

作者机构：Division of Rare Metals Metallurgy and MaterialsGRINM Group Corp.LtdGRIMAT Engineering Institute Co.LtdBeijing 100088China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第12期

页      面：3645-3650页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key Research and Development Program of China (No.2017YFB0305400) 

主　　题：Al-Hf master alloy Aluminothermic reduction Hafnium oxide Slag-alloy separation 

摘      要：The Al-Hf alloy was prepared by open aluminothermic reduction of HfO_(2) using CaF_(2) and Na F as the flux. The influence of the slag composition, the amount of aluminum, and the heat energizer was studied detailly to establish optimum conditions for the sufficient recovery of the alloy and the complete slag-alloy separation. The Al-Hf alloy with 40 wt% Hf was obtained by this method, and the maximum recovery was 70.7%. The microstructure of the alloy was observed by scanning electron microscope(SEM). Moreover, X-ray diffraction(XRD) analysis and energy-disperse spectrometry(EDS) were applied to characterize the formation of the phases. The results show that the alloy consists of Al and Al_(3)Hf phases and the oxygen content is about 0.2 wt%.