摘要
采用热压烧结法制备了3组不同成分配比的TiB 2基切削刀具,对比分析了B73H18N0、B49H18N24和B41H18C32刀具的显微组织、力学性能和摩擦学性能。结果表明:添加TiN和TiC的B49H18N24和B41H18C32刀具中未形成新的物相;3种TiB 2基切削刀具试样的硬度、抗弯强度和断裂韧性从高至低顺序依次为B73H18N0>B41H18C32>B49H18N24,B73H18N0>B41H18C32>B49H18N24和B41H18C32>B49H18N24>B73H18N0。在相同滑动速度或者载荷下,3种TiB 2基切削刀具与TA2钛合金的磨损率都随着载荷或者滑动速度增加而增大,但B41H18C32刀具的磨损率最低,即其与TA2钛合金对磨时耐磨性更好。3种TiB 2基切削刀具在干摩擦磨损过程中的磨损机制为磨粒磨损、黏着磨损和氧化磨损,且主要为黏着磨损。
Three groups of TiB 2-based cutting tools with different compositions were prepared by hot pressing sintering.The microstructure,mechanical properties and tribological properties of B73H18N0,B49H18N24 and B41H18C32 samples were compared and analyzed.The results show that no new phase is formed in B49H18N24 and B41H18C32 samples which have TiN and TiC added.The hardness,bending strength and fracture toughness of three TiB 2-based cutting tools samples are respectively B73H18N0>B41H18C32>B49H18N24,B73H18N0>B41H18C32>B49H18N24 and B41H18C32>B49H18N24>B73H18N0.Under the same sliding speed or load,the wear rate of three TiB 2-based cutting tools against TA2 titanium alloy increases with the increase of load or sliding speed,and the wear rate of B41H18C32 sample is the lowest,indicating that B41H18C32 sample has relatively better wear resistance when grinding TA2 titanium alloy.The wear mechanisms of three TiB 2-based cutting tool specimens during dry friction and wear are abrasive wear,adhesive wear and oxidation wear,and mainly adhesive wear.
作者
范晓文
王国珍
卢凤祥
FAN Xiaowen;WANG Guozhen;LU Fengxiang(Department of Mechanical Engineering,Nanjing Institute of Mechatronic Technology,Nanjing 210037,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2019年第6期62-68,共7页
Diamond & Abrasives Engineering
基金
国家自然科学基金(31500482)
关键词
TIB
2基切削刀具
微观组织
摩擦学性能
磨损机理
TiB 2-based cutting tools
microstructure
tribological properties
wear mechanism
