CNTs@T321纳米微囊填充PTFE的自润滑性能

Self-lubricating properties of CNTs@T321 nano-capsules filled PTFE

为了提高聚四氟乙烯(PTFE)的力学性能并改善其摩擦学性能,提出利用内部空腔负载润滑剂硫化异丁烯(T321)的碳纳米管微囊(CNTs@T321)作为PTFE的增强相,摩擦时纳米微囊可释放出T321,可使PTFE具有更好的润滑性能。研究填充量等对PTFE的力学和摩擦学性能的影响,分析纳米微囊在PTFE材料中的存在形式,揭示摩擦过程中微囊释放T321并产生自润滑效果的机理。结果表明:当填充量较少时,微囊可以提高PTFE的抗拉强度,当填充量超过3%(质量分数)时则会降低PTFE的强度;在不同的测试转速和载荷条件下,填充微囊都可以降低PTFE的摩擦因数和磨损率,且转速或载荷越高,减摩作用越明显,但磨损率也越大。摩擦过程中,随着PTFE的磨损,纳米微囊可释放出T321,T321在磨损界面上形成自润滑层,从而产生减摩、抗磨效果。

In order to improve the mechanical and tribological properties of polytetrafluoroethylene(PTFE),carbon nanotubes(CNTs)nano-capsules loaded with the isobutene sulfide(T321)in the internal cavity(CNTs@T321)were proposed as the reinforcing phase of PTFE.T321 can be released from the nano-capsules during friction to make PTFE have better lubrication properties.First,the effects of filling amount on the mechanical and tribological properties of PTFE composites were studied.The existing forms of nano-capsules in PTFE composites were analyzed,and the self-lubrication mechanism during friction was revealed.The results show that the tensile strength of PTFE can be improved when the content of nano-capsules is lower,and the strength of PTFE can be decreased when the mass fraction of nano-capsules exceeds 3%.Under different speeds and loads,the filling of nano-capsules can reduce the friction coefficient and wear rate of PTFE.The anti-friction effect are improved with the increase of load,while the wear rate will be increased.During the friction process,nano-capsules can release T321 with the wear of PTFE,and T321 forms a self-lubricating layer on the wear interface,thus producing anti-friction and anti-wear effects.