Oil-based superlubricity introduces a novel approach to energy conservation. Facing two main obstacles at present, i.e., higher viscosity of lubricating oil and special tribopairs, a novel solid-liquid combined system is built in this work, which is mainly based on excellent tribological property of oil-soluble dialkyl-dithiophosphoric-modified Cu nanoparticles (DDP-Cu NPs) and superior self-lubricating capability of polymeric tribopairs. In this system, polyetheretherketone (PEEK) is coupled with polytetrafluoroethylene (PTFE) to form a similar/dissimilar tribopair; and neat PAO40 (a real serving lubricating oil with high viscosity in poly-alpha olefin oil family), or PAO40 containing oil-soluble DDP-Cu NPs (PAO40 + Cu), is used as a lubricant during the sliding test. The results show that only dissimilar tribopair, i.e., PEEK-PTFE, can achieve oil-based superlubricity under the selected sliding conditions, which can be attributed to the synergistic effect between PEEK-PTFE tribopair and PAO40/PAO40 + 0.25 Cu. Furthermore, due to lower cohesive energy density (CED), PTFE is more likely to be transferred onto PEEK together with some tribochemical reactions, finally generating a high-performance tribofilm rich in carboxylated PTFE. In addition, it is concluded that, when lubricated with PAO40, the above synergistic effect is a key to achieve superlubricity; and for PAO40 + 0.25 Cu, the carboxylated PTFE and the exposed Cu core will create chelate effect, which can not only further enhance this synergistic effect, but also improve the wear-resistance of the system reaching near-zero wear. This work not only provides a novel idea for designing oil-based superlubricity system, but broadens the type of tribopair materials achieving oil-based superlubricity to some extent.
Herein, the modification of polydopamine (PDA) surface improved the high temperature stability of polysulfone (PSF)/PAO40 microcapsules ( D -microcapsules), which achieved the potential application of microcapsules in polyamide 6 (PA6). The D -microcapsules in PA6 for lubricative application has been investigated by ball-on-disc friction tests. In particular, the inclusion of 9 wt% D -microcapsules yielded the best tribological properties where the value of COF (0.088) was largely decreased as compared with that of the neat PA6(0.41). Moreover, the wear rate was found to be decreased from 4 × 10 −3 mm 3 /Nm to 4.3 × 10 −6 mm 3 /Nm. It has been demonstrated that better antifriction performance was associated with the lubricating film generated by PAO40. Therefore, the prepared PA6-based self-lubricating composites can be further applied in the field of self-lubricating materials.
Enhancing the tribological characteristics of polyamide 6 (PA6) represents an effective strategy for extending the service life of self-lubricating PA6 composites. In this investigation, hollow mesoporous carbon spheres (HMCs) with an average diameter of 10 μm were synthesized using the template method, and the crucial factors influencing HMCs preparation were thoroughly examined. Successful synthesis of polyalphaolefin oil-containing microcapsules (PAO40@HMCs) was achieved, utilizing HMCs as microcontainers and PAO40 lubricant as the core material. The self-lubricating PAO40@HMCs microcapsules exhibited a notable oil content of 76.0 wt%. The tribological properties of the prepared self-lubricating PA6 composites were significantly better than those of pure PA6. When the content of PAO40@HMCs microcapsules in the composite reached 7 wt%, the coefficient of friction (COF) for the PA6 composite decreased by 87.9% (from 0.420 to 0.051), and the wear loss was reduced by 80% (from 0.115 to 0.023 g/0.5h). Through an analysis of the morphology and transfer film of the wear surface and friction pair, it was evident that microcapsules played a pivotal role in enhancing the self-lubricating properties of PA6 composites.
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