(TiZrNbMoTa)B_(2)高熵陶瓷的制备与摩擦学性能研究  

Preparation and Tribological Properties of(TiZrNbMoTa)B_(2)High Entropy Ceramics

作　　者：高显己 辛本斌 张爱军[1] 韩杰胜[1] 孟军虎[1] GAO Xianji;XIN Benbin;ZHANG Aijun;HAN Jiesheng;MENG Junhu(State Key Laboratory of Solid lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《摩擦学学报(中英文)》2025年第2期187-197,共11页Tribology

基　　金：中国科学院战略性先导科技专项(XDB047010102);国家自然科学基金项目(52101185);甘肃省青年科技基金项目(23JRRA633);兰州化学物理研究所青年科技工作者协同创新联盟合作基金项目(HZJJ23-09);中国科学院材料磨损与防护科技创新重点实验室青年基金项目(SYSQJ-2021-2)资助.

摘　　要：通过高能球磨和放电等离子烧结(SPS)技术制备了(TiZrNbMoTa)B_(2)高熵陶瓷,探讨了球磨条件对高熵陶瓷物相组成、微观结构和力学性能影响,着重研究了(TiZrNbMoTa)B_(2)高熵陶瓷从25~800℃的摩擦学性能及磨损机制.结果表明:随着球磨速度的提高,(TiZrNbMoTa)B_(2)高熵陶瓷内各元素分布趋向均匀,(TiZrNbMoTa)B_(2)逐渐形成单一均匀的具有六方最密堆积(HCP结构)的金属二硼化物固溶相;高熵陶瓷的硬度、断裂韧性和弯曲强度也随之提升.(TiZrNbMoTa)B_(2)高熵陶瓷的高温耐磨性能较低温耐磨性能提高了36倍,其磨损机制由中低温的磨粒磨损转变为高温下的氧化磨损和磨粒磨损.B_(2)O_(3)的高温自润滑效应和磨损表面氧化釉质层的生成是高熵陶瓷具有良好高温耐磨性能的主要原因.High-entropy diboride ceramics possess the advantages of refractory metal borides and high-entropy materials,with high hardness and good oxidation resistance,and are,therefore,expected to be applied in hightemperature wear-resistant fields.However,current research reports on high-entropy diboride ceramics mainly focus on synthesis,preparation,mechanical properties,and oxidation resistance,while tribological properties still need to be improved.In addition,high-entropy diboride ceramics still have problems,such as high synthesis temperature,poor density,element segregation,and poor fracture toughness.Therefore,it is necessary to improve the preparation process of high-entropy diboride ceramics and explore their tribological properties.This study selected(TiZrNbMoTa)B_(2)with high hardness as the basic component,and using five refractory transition metal element powders of Ta,Mo,Ti,Zr,Nb,and boron powder as raw materials,successfully prepared(TiZrNbMoTa)B_(2)high-entropy ceramics through high-energy ball milling and SPS in-situ reaction sintering.The improvement process aimed to reduce the reaction energy and the introduction of impurities.The influence of the preparation process of(TiZrNbMoTa)B_(2)high-entropy ceramics on its microstructure and mechanical properties was investigated.In order to further broaden the application of high-entropy diboride and provide technical and theoretical support for improving the tribological properties of high-entropy diboride,the tribological properties of(TiZrNbMoTa)B_(2)high-entropy ceramics from 25℃to 800℃were emphatically explored.The changes in the composition and structure of(TiZrNbMoTa)B_(2)high-entropy ceramics before and after friction were analyzed in detail using XPS,SEM,DSC-TG,and other characterization methods.The wear mechanism and wear resistance mechanism of(TiZrNbMoTa)B_(2)high-entropy ceramics were analyzed.The main results and conclusions were as follows:with the increase of milling speed,the distribution of elements in(TiZrNbMoTa)B_(2)high entropy diborid

关 键 词：高熵陶瓷 高熵硼化物 力学性能 摩擦学性能 磨损机制 

分 类 号：TH117.1[机械工程—机械设计及理论] TB321[一般工业技术—材料科学与工程]