Eliminating carbon contamination with improved one-step electrochemical preparation of refractory high-entropy alloy TiZrHfNbTa  

作　　者：Peng Li Jinhang Fan Kaifa Du Peilin Wang Ao Liu Huayi Yin Dihua Wang 

机构地区：[1]International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province,Wuhan University,Wuhan 430072,China [2]School of Resource and Environmental Science,Wuhan University,Wuhan 430072,China

出　　处：《Journal of Materials Science & Technology》2023年第32期132-139,共8页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52031008,12102307,and 11872284).

摘　　要：Creating refractory high-entropy alloys(RHEAs)effectively without impurities is a momentous challenge.Conventional methods for the preparation of RHEAs have exacting requirements for raw material purity and energy consumption.Molten salt electrolytic oxides are applied to the preparation of HEAs by virtue of their low cost and high efficiency.However,the use of graphite anodes in electrolysis will result in the carbon contamination of the products due to the deposition of CO_(3)^(2−)at the cathode.Increasing the reaction temperature accelerates the deoxidation of the oxide,thus reducing the amount of carbide but not eliminating it.Switching HfH_(2)instead of HfO_(2)and using Nb_(2)O_(5)to shield the precursor can effectively remove carbon contamination.However,this leads to a complicated preparation process and energy waste.Herein,we use the solid oxygen ion-conducting membrane(SOM)containing graphite and Sn(named as SOM@C/Sn)anode to separate the carbon from the molten salt and prevent the circulation of CO_(3)^(2−).The pure single-phase TiZrHfNbTa RHEA can be produced in only one-step with the SOM@C/Sn anode,which completely solves the problem of carbon contamination in the molten salt electrolysis preparation of HEAs.This work provides a feasible solution for the preparation of novel complex alloys such as carbon-free RHEAs in a low-cost short process.

关 键 词：High entropy alloy TiZrHfNbTa Molten salt ELECTROLYSIS Carbon contamination 

分 类 号：TG139[一般工业技术—材料科学与工程]