油酸修饰纳米BN/TiN润滑添加剂的摩擦学性能研究EI北大核心CSCD

使用油酸对BN,TiN,BN/TiN纳米添加剂进行表面改性修饰,通过傅里叶红外光谱仪进行表征,利用四球摩擦磨损试验机考察润滑油纳米添加剂的摩擦学性能。结果表明:油酸成功枝接在纳米颗粒表面,提高其分散性能。与纯基础油相比,纳米添加剂工况摩擦因数降低11.7%,磨斑直径降低29.5%,磨斑表面未出现起皮脱落现象,沟槽深度、宽度明显降低,混合BN/TiN纳米添加剂表现出协同润滑作用。纳米BN,TiN颗粒能够进入摩擦副中,起到微轴承作用,降低摩擦磨损,进入摩擦副中的纳米BN与摩擦副基体材料发生化学反应,生成氮化硼、氧化硼、氧化铁等物质修复磨损表面。

Tribological properties of nano-BN/TiN lubricating additives modified with oleic acid

BN,TiN and BN/TiN nano-additives were modified by oleic acid,characterized by Fourier transform infrared spectroscopy.The tribological properties of lubricating oil nano-additives were tested by four-ball friction and wear tester.The results show that oleic acid is grafted onto the surface of nanoparticles to improve their dispersibility.Compared with pure base oil,lubricating oil with nano-additives reduces friction coefficient by 11.7%and wear scar diameter by 29.5%,respectively.No peeling and falling off appears on the surface of wear scar,and the depth and width of groove are obviously reduced,compared with single nano-additive BN or TiN,BN/TiN displays synergistic lubrication when mixed nano-additive BN/TiN is used.The nano-BN and TiN particles can enter the friction pair,play the role of micro-bearing,reduce friction and wear.The nano-BN entering the friction pair and reacting with the matrix material of the friction pair can form boron nitride,boron oxide and iron oxide to repair the wear surface.