(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)高熵陶瓷的相结构及电化学性能  

Phase Composition and Electrochemical Properties of(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2) High-entropy Ceramics

作　　者：李雪婷 魏志帆 祖宇飞[1] 陈国清[1] 付雪松[1] 周文龙[1] LI Xueting;WEI Zhifan;ZU Yufei;CHEN Guoqing;FU Xuesong;ZHOU Wenlong(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,Liaoning,China)

机构地区：[1]大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116085

出　　处：《陶瓷学报》2023年第4期688-694,共7页Journal of Ceramics

基　　金：国家自然科学基金(52075073)。

摘　　要：硼化物高熵陶瓷因其优异的力学性能、良好的抗氧化性以及电化学性能,而具有广阔的应用前景。采用硼/碳热还原法结合放电等离子烧结技术制备了(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)高熵陶瓷,并对物相组成和电化学性能进行研究。结果表明,在1600℃、1650℃、1700℃还原得到的(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)高熵陶瓷粉体和经2000℃烧结后的块体均未呈现单一六方结构的高熵相,烧结体中含有少量的(Hf,Zr)B2和(Hf,Zr)O_(2)次生相弥散分布于高熵相之间。随着还原温度的升高,粉体的结晶度越好。(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)的致密度为96%,其硬度为(23.4±1.2)GPa。此外,(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)表现出较好的能量存储特性和抗腐蚀性能,当其在3.5 wt.%NaCl中,且电流密度为0.1 mA·cm^(−2)时,充/放电比电容可达50.29/44.50 F·cm^(−2),库伦效率可达87%以上,满足作为超级电容器电极材料的要求。Boride high-entropy ceramics have broad application prospects because of their excellent mechanical properties,high oxidation resistance and promising electrochemical properties.(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)high-entropy ceramics were prepared through boro/carbothermal reduction combined with spark plasma sintering technology.Phase composition and electrochemical properties of the as-sintered samples were studied.It is demonstrated that the(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)high-entropy ceramic powders obtained at 1600℃,1650℃and 1700℃and the bulk ceramics sintered at 2000℃did not exhibit single hexagonal structure high-entropy phase.The as-sintered bulk had small content of second phase(Hf,Zr)B2 and(Hf,Zr)O_(2)distributed in between the high-entropy phase.As the reduction temperature is increased,the crystallinity of the powder is increased.The sintered(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)ceramics have a relative density of 96%and a hardness of(23.4±1.2)GPa.In addition,the(Hf_(0.2)Zr_(0.2)Ta_(0.2)Mo_(0.2)Ti_(0.2))B_(2)ceramics exhibited high energy storage performance and corrosion resistance.At a current density of 0.1 mA·cm^(−2)in 3.5 wt.%NaCl,the charge/discharge ratio capacitance can reach 50.29/44.50 F·cm^(−2)and the coulombic efficiency can be>87%,satisfying the standards of the electrode material for supercapacitors.

关 键 词：硼化物 高熵陶瓷 相结构 电化学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]