(TiZrNbTaMe)C(Me=V,Cr,Mo,W)高熵陶瓷的显微结构演变及元素分布  

Microstructural Evolution and Elemental Distribution of(TiZrNbTaMe)C(Me=V,Cr,Mo,W)High-Entropy Ceramics

作　　者：孔庆易 王恺 陈磊 苏文韬[2,3] 霍思嘉 王玉金 KONG Qingyi;WANG Kai;HEN Lei;SU Wentao;HUO Sijia;WANG Yujin(National Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin 150001,China;National Key Laboratory of Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China;Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学,材料结构精密焊接与连接全国重点实验室,哈尔滨150001 [2]哈尔滨工业大学,金属精密热加工国家级重点实验室,哈尔滨150001 [3]哈尔滨工业大学材料科学与工程学院,特种陶瓷研究所,哈尔滨150001

出　　处：《硅酸盐学报》2025年第2期241-248,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52032002)。

摘　　要：随着航空航天、核能和特种冶炼行业的快速发展,对新型超高温、抗辐照、耐腐蚀等极端环境使役性能需求不断提升,亟需新材料创制和性能调控。过渡金属碳化物具有高熔点、抗辐照、耐腐蚀和理化性能稳定等优异性能,是极端环境用特种陶瓷重要的组成部分。现今,碳化物陶瓷更是逐渐从单一组元发展到多组元碳化物固溶体体系,乃至高熵陶瓷体系。本工作采用热压烧结,制备4种高熵碳化物陶瓷(TiZrNbTaMe)C(Me=V,Cr,Mo,W),比较Me元素对陶瓷组织结构和力学性能的影响。结果表明:4种高熵碳化物陶瓷均呈现面心立方结构,其中V、Cr和Mo元素有助于烧结促进致密化,致密度均超过98%。除(TiZrNbTaCr)C外,其他高熵陶瓷体系的金属元素分布均匀,而Cr元素在(TiZrNbTaCr)C陶瓷中出现晶界偏聚现象,导致碳化物晶粒中的Cr含量较低。Cr元素在碳化物高熵陶瓷中的固溶度与金属元素的种类和含量密切相关。(TiZrNbTaCr)C陶瓷具有最佳的综合力学性能,其维氏硬度为29.8 GPa,断裂韧性为3.71 MPa·m^(1/2)。Introduction Ultra-high temperature ceramics include a series of high melting point materials,such as transition metal carbides,nitrides and borides,especially transition metal carbides with excellent high-temperature mechanical properties,stable physico-chemical properties,corrosion resistance and radiation resistance,showing broad prospects for application in the hypersonic aircraft,rocket engines,fourth-generation nuclear reactor,and other extreme environments.However,the traditional single-component transition metal carbide ceramics have been unable to meet the emerging requirements under extreme environments,there is an urgent need to develop a new high-performance material under ultra-high temperature.In recent years,the concept of multi-component“high entropy”has greatly expanded the scope of material composition design and property optimization.Compared with single-component carbides,multi-component ceramics perform better in terms of overall properties,including hardness,creep resistance,oxidation resistance and radiation resistance.These improvements mainly result from their complex component composition,electronic structure and lattice distortion.At present,the influence of elemental species on the microstructure evolution and mechanical properties of carbide high-entropy ceramics is not reported.In this paper,(TiZrNbTaMe)C(Me=V,Cr,Mo,W)high-entropy ceramics are prepared by hot press sintering,and the effects of Me elemental species on the physical phase,microstructure evolution,and mechanical properties of(TiZrNbTaMe)high-entropy ceramics are investigated.Methods In this work,(TiZrNbTaMe)C(Me=V,Cr,Mo,W)high-entropy ceramics with equimolar ratio were prepared by carbothermal reduction-assisted hot pressing using transition metal oxides and carbon black as raw materials.The oxides and carbon black were mixed using a planetary ball mill(Fritsch,model P4,Germany).Carbide powders were obtained by carbothermal reduction under vacuum using a pressureless sintering furnace(WS0404,Ningxia Sincere Co.Ltd.,C

关 键 词：过渡金属碳化物 高熵陶瓷 组织演变 力学性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]