钒添加量对Mo2FeB2基金属陶瓷显微组织和力学性能的影响  

Effect of V Addition Amount on Microstructure and Mechanical Properties of Mo2FeB2-Based Cermets

作　　者：李万发 周佳 王浩 吕学鹏[1,2,3] 郑勇[3] LI Wanfa;ZHOU Jia;WANG Hao;LU Xuepeng;ZHENG Yong(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing Institute of Technology,Nanjing 211167,China;College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211100,China)

机构地区：[1]南京工程学院材料工程学院,南京211167 [2]南京工程学院江苏省先进结构材料与应用技术重点实验室,南京211167 [3]南京航空航天大学材料科学与技术学院,南京211100

出　　处：《机械工程材料》2019年第11期32-36,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(NSFC-51602145);江苏省博士后基金资助项目

摘　　要：采用真空液相烧结技术制备了Mo2FeB2基金属陶瓷,研究了钒添加量(质量分数,0~7.5%)对其组织和力学性能的影响。结果表明:当钒添加量不大于2.5%时,金属陶瓷的孔隙率无明显变化,当钒添加量大于2.5%时,金属陶瓷中的孔隙明显增多,金属陶瓷的致密性下降;钒的添加对金属陶瓷的相组成无显著影响,Mo2FeB2硬质相均匀分布在铁基黏结相中;当钒添加量为2.5%时,硬质相呈长条状且明显细化;当钒添加量大于2.5%时,硬质相发生团聚,且形貌由长条状向等轴状转变;随着钒添加量的增加,金属陶瓷的硬度、抗弯强度和断裂韧度均先增后降,当钒添加量为2.5%时均达到最大值,分别为90.6HRA、2 350MPa和15.1MPa·m1/2。Mo2FeB2-based cermets were prepared by vacuum liquid phase sintering technique.The effect of V addition amount(0-7.5 wt%)on the microstructure and mechanical properties of cermets was investigated.The results show that the porosity of cermets had little change when V addition amount was not more than 2.5 wt%.When V addition amount was more than 2.5 wt%,pores in cermets increased obviously and the relative density of cermets decreased.V addition had no effect on the phase composition of cermets,and Mo2FeB2 hard phase was uniformly distributed in the iron-base bonding phases.When the V addition amount was 2.5 wt%,hard phase was long ribbon shape and was obviously refined.When V addition amount exceeded 2.5 wt%,hard phase agglomerated and its morphology changed from long ribbon shape to equiaxial shape.With the increase of V addition amount,the hardness,rupture strength and fracture toughness all first increased and then decreased,and reached their maximum values with V addition amount of 2.5 wt%,which were 90.6 HRA,2 350 MPa and 15.1 MPa·m1/2,respectively.

关 键 词：MO2FEB2基金属陶瓷 显微组织 硬度 抗弯强度 断裂韧性 

分 类 号：TB33[一般工业技术—材料科学与工程]