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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 friction and wear resistance of n-SiO2 additives with different mass percentages were investigated respectively with and without ultrasonic vibration, and the lubricating mechanism of the nanosilica (n-SiO2) additive under ultrasonic vibration was discussed. The results show that: Ultrasonic vibration can improve the lubrication state of the friction surface by reducing the positive pressure on the nanoparticle, promoting the rolling of the nanoparticles and increasing the activity of the friction surface. Ultrasonic vibration decreases the depth of the wear scar under the n-SiO2 lubrication and reduces the surface hardness , The content of Si in the wear surface increased, which effectively improved the lubrication state of the friction surface.Under the experimental range, ultrasonic vibration had the most significant effect on the friction and wear resistance of 0.5% n-SiO2 additive, and the friction coefficient 45 # steel surface wear volume decreased by 12% and 34%.