碳纳米管在润滑脂中的摩擦学性能及机制研究
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摘要
以碳纳米管为添加剂制备锂基润滑脂,并探究碳纳米管含量、管径及管长对其摩擦学性能的影响。结果表明:碳纳米管可明显提高润滑脂的摩擦学性能;随碳纳米管质量分数的增加,润滑脂的摩擦学性能先提高后下降,碳纳米管质量分数为0.05%时润滑脂的摩擦学性能最佳;添加管径小、管长大的碳纳米管时润滑脂表现出更优秀的摩擦学性能,这是因为管径小、管长大的碳纳米管可能更容易被填充到表面微凸体的凹槽中。磨斑XPS结果显示,润滑膜中有氧化铁及碳纳米管的存在,氧化铁与碳纳米管等边界膜起到减摩抗磨的作用。
The lithium-based grease was prepared by using carbon nanotubes as an additive,and the effects of additive content,diameter and length of the tubes on the tribological properties were investigated.The results show that carbon nanotubes can obviously improve the tribological properties of lithium-based grease.With the increasing of the mass fraction of carbon nanotubes,the tribological properties of grease are first increased and then decreased.When the mass fraction of carbon nanotubes is 0.05%,the grease has the best tribological properties.The grease exhibits better tribological properties when adding the carbon nanotubes with small diameter and large tube length.This is because carbon nanotubes with small diameter and large tube lengths may be more easily filled into the grooves of the surface asperities.XPS analysis results show that there are iron oxide and carbon nanotubes in the lubricating film,and the boundary films such as iron oxide and carbon nanotubes play the role of friction-reducing and antiwear properties.
The lithium-based grease was prepared by using carbon nanotubes as an additive,and the effects of additive content,diameter and length of the tubes on the tribological properties were investigated.The results show that carbon nanotubes can obviously improve the tribological properties of lithium-based grease.With the increasing of the mass fraction of carbon nanotubes,the tribological properties of grease are first increased and then decreased.When the mass fraction of carbon nanotubes is 0.05%,the grease has the best tribological properties.The grease exhibits better tribological properties when adding the carbon nanotubes with small diameter and large tube length.This is because carbon nanotubes with small diameter and large tube lengths may be more easily filled into the grooves of the surface asperities.XPS analysis results show that there are iron oxide and carbon nanotubes in the lubricating film,and the boundary films such as iron oxide and carbon nanotubes play the role of friction-reducing and antiwear properties.
引文
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[2]PENG Y T,HU Y Z,WANG H.Tribological behaviors of surfactant-functionalized carbon nanotubes as lubricant additive in water[J].Tribology Letters,2007,25(3):247-253.
[3]PEI X W,HU L T,LIU W M,et al.Synthesis of water-soluble carbon nanotubes via surface initiated redox polymerization and their tribological properties as water-based lubricant additive[J].European Polymer Journal,2008,44(8):2458-2464.
[4]YU B,LIU Z L,ZHOU F,et al.A novel lubricant additive based on carbon nanotubes for ionic liquids[J].Materials Letters,2008,62(17/18):2967-2969.
[5]AHMADI H,RASHIDI A,NOURALISHAHI A,et al.Preparation and thermal properties of oil-based nanofluid from multiwalled carbon nanotubes and engine oil as nano-lubricant[J].International Communications in Heat and Mass Transfer,2013,46:142-147.
[6]YU B,LIU Z L,MA C B,et al.Ionic liquid modified multiwalled carbon nanotubes as lubricant additive[J].Tribology International,2015,81:38-42.
[7]LIU H T,JI H M,HONG H P,et al.Tribological properties of carbon nanotube grease[J].Industrial Lubrication and Tribology.2014,66(5):579-583.
[8]MOHAMED A,OSMAN T A,KHATTAB A,et al.Tribological behavior of carbon nanotubes as an additive on lithium grease[J].Journal of Tribology,2015,137(1):011801-1-5.
[9]姜鹏,姚可夫.碳纳米管作为润滑油添加剂的摩擦磨损性能研究[J].摩擦学学报,2005,25(5):394-397.JIANG P,YAO K F.Investigation on tribological properties of lubricating oil with carbon nanotubes additive[J].Tribology,2005,25(5):394-397.
[10]CORNELIO J A,CUERVO P A,HOYOSPALACIO L M,et al.Tribological properties of carbon nanotubes as lubricant additive in oil and water for a wheel-rail system[J].Journal of Materials Researchand Technology,2016,5(1):68-76.
[11]陈传盛,陈小华,刘天贵,等.碳纳米管的化学修饰以及作为润滑油添加剂的摩擦学性能研究[J].化学学报,2004,62(14):1367-1372.CHEN C S,CHEN X H,LIU T G,et al.Chemical modification of carbon nanotubes and tribological properties as lubricant additive[J].Acta Chimica Sinica,2004,62(14):1367-1372.
[12]CHEN C S,CHEN X H,XU L S,et al.Modification of multiwalled carbon nanotubes with fatty acid and their tribological properties as lubricant additive[J].Carbon,2005,43(8):1660-1666.
[13]MENG Y,SU F,CHEN Y,et al.Au/Graphene oxide nanocomposite synthesized in supercritical CO2fluid as energy efficient lubricant additive[J].ACS Applied Materials&Interfaces,2017,9(45):39549-39559.
[14]XU Y F,PENG Y B,DEARN K D,et al.Synergistic lubricating behaviors of graphene and MoS2 dispersed in esterified bio-oil for steel/steel contact[J].Wear,2015:297-309.
[15]MENG Y,SU F H,CHEN Y Z,et al.A novel nanomaterial of graphene oxide dotted with Ni nanoparticles produced by supercritical CO2-assisted deposition for reducing friction and wear[J].ACS Applied Materials&Interfaces,2015,7(21):11604-11612.
[16]郭晓燕,彭倚天,胡元中,等.碳纳米管添加剂摩擦学性能研究及机制探讨[J].润滑与密封,2007,32(11):95-97.GUO X Y,PENG Y T,HU Y Z,et al.The Tribological behaviors and mechanism of carbon nanotubes as oil additive[J].Lubrication Engineering 2007,32(11):95-97.