超声振动对纳米二氧化硅(n-SiO2)添加剂减摩抗磨性能的影响

在有和无超声振动条件下,分别考察了含不同质量百分数n-SiO2添加剂的减摩抗磨性能,初步探讨了超声振动下纳米二氧化硅(n-SiO2)添加剂的润滑机理.结果表明:超声振动通过减小纳米微粒所受的正压力、促进纳米微粒滚动及增加摩擦表面的活性3种方式改善摩擦表面的润滑状态.超声振动使n-SiO2润滑下的磨痕深度下降,表面硬度降低,磨损表面Si元素含量增加,有效地改善了摩擦表面的润滑状态.在试验范围内,超声振动对0.5%n-SiO2添加剂的减摩抗磨性能影响效果最显著,摩擦副间的摩擦系数和45#钢表面的磨损体积量分别降低了12%和34%.

The Effect of Ultrasonic Vibration on Tribological Performance with n-SiO2 Additives

The tribological performance was investigated with different content of n-SiO₂ additives, with or without ultrasonic vibration conditions, and the lubrication mechanism with ultrasonic vibration and n-SiO₂ additives was discussed. The results show that ultrasonic vibration can improve the lubricating state of friction surface by three ways which are reducing the nano-particles suffered positive pressure, promoting the rolling of nano-particles and increasing the activity of friction surface. The wear scar depth and surface hardness decreased under n-SiO₂ lubrication with ultrasonic vibration, the content of Si element in the wear surface increased, and the lubricating state of friction surface was effectively improved. Within the experimental range, the tribological performance was remarkably affected by ultrasonic vibration when the content of n-SiO₂ additives is 0.5%, and the friction coefficient between friction pair and the wear volume of the 45 steel surfaces was reduced by 12% and 34% respectively.