柠檬酸络合法结合球磨分散制备高熵碳化物及其性能研究  

Study on preparation and properties of high entropy carbides by combining citric acid complexing method and ball-milling dispersion

作　　者：刘虎林 党锋珍 刘长青[1] 薛云龙 伍媛婷[1] LIU Hu-lin;DANG Feng-zhen;LIU Chang-qing;XUE Yun-long;WU Yuan-ting(School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi′an 710021, China)

机构地区：[1]陕西科技大学材料科学与工程学院陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021

出　　处：《陕西科技大学学报》2022年第2期102-108,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51702192);陕西省科技厅自然科学基金项目(2019JQ-451);中国科学院上海硅酸盐研究所高性能陶瓷与超细微观结构国家重点实验室开放基金项目(SKL201901SIC);陕西科技大学博士科研启动基金项目(2016BJ-17)。

摘　　要：高熵碳化物陶瓷由于其熔点高、硬度大、热导率低和抗热震性强等优点,有望应用于航空航天领域,而粉体的合成是制备陶瓷的基础.本研究采用柠檬酸络合法结合球磨分散制备了(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Mo_(0.2))C和(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Hf_(0.2))C两种高熵碳化物粉体,并对其相组成、显微组织、元素分布和抗氧化性进行分析表征.结果表明:该方法可分别在1650℃和1850℃下合成单相的(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Mo_(0.2))C和(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Hf_(0.2))C碳化物粉体.两种碳化物元素分布均匀,平均粒径分别为44±9 nm和285±74 nm,氧含量为2.12%和0.58%.与混合的碳化物粉体相比两种高熵碳化物粉体具有良好的抗氧化性.High-entropy carbide ceramic has become new candidates of ultra-high temperature ceramics used as structural components in aerospace propulsion systems due to their advantages of high melting point,high hardness,low thermal conductivity and strong thermal shock resistance.The synthesis of powder is the basis of ceramic preparation.We developed a new method to synthesize single-phase high-entropy carbide powders by combining citric acid complexing method and ball-milling dispersion.Phase composition,microstructure,element distribution and oxidation resistance of the obtained carbide powders were investigated.Single-phase(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Mo_(0.2))C and(Zr_(0.2)Ti_(0.2)Ta_(0.2)Nb_(0.2)Hf_(0.2))C are fabricated at 1650℃and 1850℃.Metal elements of the obtained powders are distributed uniformly.The particle sizes were 44±9 nm and 285±74 nm,and the oxygen content was 2.12%and 0.58%,respectively.The synthesized high entropy carbide powders have better oxidation resistance compared with the mixed carbide powders.

关 键 词：高熵碳化物 微观结构 溶胶凝胶法 球磨混合 

分 类 号：TB321[一般工业技术—材料科学与工程]