添加纳米TiC对Mo_(2)BC复合材料力学性能和摩擦学行为的影响  

Effect of Nano-TiC Additive on Mechanical and Tribilogical Behavior of Mo_(2)BC Composites

作　　者：张智源[1,2] 和淑文 王帅 逄显娟[1] 杜三明[1] 张永振[1] ZHANG Zhiyuan;HE Shuwen;WANG Shuai;PANG Xianjuan;DU Sangmin;ZHANG Yongzhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Henan Institute of Technology,Xinxiang 453003,China)

机构地区：[1]河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳471023 [2]河南工学院材料科学与工程学院,河南新乡453003

出　　处：《河南科技大学学报（自然科学版）》2023年第6期9-15,M0002,M0003,共9页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(92266205,51805513);河南省自然科学基金项目(2022M712942);固体润滑国家重点实验室开放课题项目(LSL-2014)。

摘　　要：本文以Mo_(2)BC粉为原料,纳米TiC粉为添加相,采用快速热压烧结技术制备了Mo_(2)BC-TiC陶瓷复合材料。研究了添加质量分数5%的纳米TiC对Mo_(2)BC-TiC复合材料的微观组织、力学性能和摩擦学性能的影响。结果表明:添加质量分数5%的纳米TiC可以显著改善Mo_(2)BC陶瓷的烧结性能和微观组织,提高其力学性能。添加纳米TiC后,复合材料的相对密度、维氏硬度、弯曲强度、压缩强度和断裂韧性可以分别达到98.9%、18.1 GPa、480.5 MPa、2.9 GPa和4.1 MPa·m^(1/2)。Mo_(2)BC-TiC复合材料的断裂方式主要是穿晶断裂。Mo_(2)BC-TiC复合材料还表现出了良好的摩擦磨损性能,摩擦因数为0.42,磨损率为0.6×10^(-5)mm^(3)/(N·m)。Mo_(2)BC-TiC composites were fabricated by fast hot-pressing sintering method with Mo_(2)BC powder as raw material and nano-TiC powder as sintering additive.The effect of nano-TiC additive(mass fraction of 5%)on microstructure and tribilogical behavior of Mo_(2)BC composite was investigated.The results show that the addition of nano-TiC significantly improves the sintering properties,microstructure and mechanical properties of Mo_(2)BC ceramic.The relative density,Vickers hardness,flexure strength,compressive strength and fracture toughness of Mo_(2)BC composites are 98.9%,18.1 GPa,480.5 MPa,2.9 GPa and 4.1 MPa·m^(1/2),respectively.Transgranular fracture is the main fracture mode of Mo_(2)BC-TiC composite.Mo_(2)BC-TiC composite also exhibites a good tribological properites with the friction coefficient of 0.42 and wear rate of 0.6×10^(-5)mm^(3)/(N·m).

关 键 词：Mo_(2)BC-TiC复合材料 微观组织 力学性能 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]