碳纳米管作为润滑油添加剂的摩擦磨损性能研究

采用催化裂解法制备了多壁碳纳米管,在M-200型摩擦磨损试验机上考察了碳纳米管作为长城SE级15W/30汽油机油添加剂的摩擦磨损性能,采用表面形貌仪测量其磨斑轮廓并计算磨损体积损失,用扫描电子显微镜对磨斑表面形貌进行观察分析. 结果表明: 碳纳米管作为润滑油添加剂表现出优良的抗磨性能,在质量分数仅为0.0125%～0.1000%时,润滑油的抗磨性能显著提高;在质量分数约为0.0500%时其抗磨效果最佳,磨损率降低幅值达57%;在较高载荷下,添加0.0250%的碳纳米管能够使其摩擦系数减小约15%,但随着碳纳米管质量分数的增加,摩擦系数迅速提高;含碳纳米管润滑油的磨斑表面平整,划痕较细且分布均匀.

Investigation on Tribological Properties of Lubricating Oil with Carbon Nanotubes Additive

Carbon nanotubes(CNTs), synthesized by catalytic decomposition of hydrocarbon gases method, can be well dispersed in lubricating oil when they were treated by ball milling. Effects of CNTs as an additive of commercial lubricating oil Great Wall SE 15W/30 on the friction and wear properties have been studied. Worn surface morphology was examined with scanning electron microscopy(SEM), and wear volume was measured with a Talysurf 5P-120 topographer. Results show that CNTs, in mass concentration of 0.01%~0.1%, can greatly improve the antiwear ability of lubricating oil. With addition of CNTs, the maximum reduction of wear rate is about 57%, and scratches on the worn surfaces become slighter and more uniform. The maximum decrease of friction coefficient is about 15% with 0.025% CNTs additive at the load of 300 N. The antiwear mechanism has been discussed.