Self-lubricating Mechanism Research Articles

Construction of biomimetic textures and modification of self-lubrication mechanisms on the surface of sulfonated polyether ether ketone films

Construction of biomimetic textures and modification of self-lubrication mechanisms on the surface of sulfonated polyether ether ketone films

Laser Direct Writing of Setaria Virids-Inspired Hierarchical Surface with TiO2 Coating for Anti-Sticking of Soft Tissue.

In minimally invasive surgery, the tendency for human tissue to adhere to the electrosurgical scalpel can complicate procedures and elevate the risk of medical accidents. Consequently, the development of an electrosurgical scalpel with an anti-sticking coating is critically important. Drawing inspiration from nature, we identified that the leaves of Setaria Virids exhibit exceptional non-stick properties. Utilizing this natural surface texture as a model, we designed and fabricated a specialized anti-sticking surface for electrosurgical scalpels. Employing nanosecond laser direct writing ablation technology, we created a micro-nano textured surface on the high-frequency electrosurgical scalpel that mimics the structure found on Setaria Virids leaves. Subsequently, a TiO2 coating was deposited onto the ablated scalpel surface via magnetron sputtering, followed by plasma-induced hydrophobic modification and treatment with octadecyltrichlorosilane (OTS) to enhance the surface's affinity for silicone oil, thereby constructing a self-lubricating and anti-sticking surface. The spreading behavior of deionized water, absolute ethanol, and dimethyl silicone oil on this textured surface is investigated to confirm the effectiveness of the self-lubrication mechanism. Furthermore, the sticking force and quality are compared between the anti-sticking electrosurgical scalpel and a standard high-frequency electrosurgical scalpel to demonstrate the efficacy of the nanosecond laser-ablated micro-nano texture in preventing sticking. The findings indicate that the self-lubricating anti-sticking surface fabricated using this texture exhibits superior anti-sticking properties.

Self-Lubrication Mechanism of Surface-Textured Polymer-Matrix Composites under the Induction of Frictional Stress.

Polymer-matrix composites have been widely used in the manufacture of seals, bearings, electrical insulators, and self-lubricating films as engineering applications move toward lighter weight, higher strength, and corrosion resistance. However, the high-speed shear effect of the friction pairs in relative motion leads to localized heating of the polymer surface, resulting in deformation or softening of the device. Herein, acer mono maple and canna leaves were used as templates to construct polymer-matrix sulfonated polyether-etherketone/polytetrafluoro-wax (SPEEK/PFW) composites with a surface-textured structure. As the bionic texture reduces the level of direct contact between the friction pairs, the frictional thermosoftening of SPEEK occurs in the localized areas of the bumps and leads to the release of PFW stored in textures, resulting in the formation of a soft polymer sliding layer in the worn area and greatly enhancing the frictional stability. By investigation of the tribological properties of textured SPEEK/PFW composites under different loads and sliding speeds, the mechanisms from surface wear to matrix softening and spontaneous construction of a slipping layer are summarized. The results of scanning electron microscopy and three-dimensional profilometer characterization of the wear scars show the surface state of SPEEK/PFW after friction, revealing the friction-thermotropic deformation of the surface texture. The results of this study not only improve our understanding of the frictional heat-induced surface self-lubrication mechanism of textured polymer composites but also provide a reference for the development of multiphase hybrid polymer-matrix composites with excellent self-lubrication properties.

Sliding interface characteristics and self-lubrication mechanism of B4C-Al2O3 composite ceramics

B4C ceramics are an important structural material in the field of engineering. However, B4C ceramics have two fatal drawbacks: low fracture toughness and high friction coefficient. The design strategy and tribological mechanism of B4C ceramics with low friction are studied in this paper. The results show that the incorporation of Al2O3 as a second phase can not only increase the fracture toughness but also reduce the friction coefficient of B4C ceramics, achieving the self-lubrication of B4C ceramics. The low friction design strategy of B4C ceramics is realized by incorporating a second phase of Al2O3 to change the physical characteristic of the sliding surface. The sliding interface characteristic of in situ formed surface texture with an appropriate proportion of valleys in the sliding process is the most important factor for the improved tribological properties of B4C-Al2O3 composite ceramics. As the amount of Al2O3 incorporated is 30 wt%, B4C-Al2O3 composite ceramics have the most appropriate proportion of valleys in the surface texture, thus exhibiting the lowest friction coefficient. The clean phase boundary makes the bonding between B4C and Al2O3 grains firm, which is the key to achieving the function of the surface texture formed in situ. B4C-Al2O3 composite ceramics with both high fracture toughness and low friction coefficient will open a wider range of applications.

Analysis of Lubrication Regimes for Porous Sliding Bearing

The purpose of this paper is to analyze the lubrication quality of porous sliding bearings, starting from the bearing model and in combination with experimental results aimed at analyzing the lubrication regimes of different working conditions. The separation between the surfaces by the lubricant layer is what determines the regime. The quality and type of lubrication regime are determined by parameters in the mathematical model including typically speed, load, motion, materials, environment, etc., which have an impact on friction. Besides those elements, important parameters such as coefficient of friction (COF) and working temperature are to be measured due to experimental investigations to detect an equilibrium working state. The self-lubrication mechanism in porous metal bearings improves their service life and lubrication processes; however, the COF still varies within a wide interval. This variability can be understood, considering that during bearing operation it operates within a broad range of lubrication regimes. Those findings are explained in the paper by using a combination of calculated parameters according to the bearing model and in combination with our own results of experimental investigations. With the obtained results for particular working conditions, the authors are trying to explain, in the form of a diagram with the limit line as an important outcome of the work, that the lubrication regime for porous metal bearings could arise from boundary lubrication (BL) close to hydrodynamic lubrication (HDL).

Design of solid-liquid composite lubrication coatings based on thermal sprayed ceramic templet

A solid-liquid composite lubrication coating capable of controlling friction and wear has received widespread attention among researchers. Here, a novel self-lubricating ceramic coating was created through a combination of thermal spraying, hydrothermal reactions, and vacuum impregnation. Its mechanical properties, tribological performance, and self-lubrication mechanism were thoroughly analyzed. The results indicate that the thermally sprayed ceramic coating contained carbon spheres and perfluoropolyether. As a result of the in-situ synthesis of carbon spheres, the coating exhibited enhanced mechanical properties. Compared to the single solid lubricant coating, the solid-liquid composite coating decreased the coefficient of friction by 46.7% to 0.112 and decreased the wear rate from 1.25 × 10−6 mm3/m N to 3.70 × 10−7 mm3/m N. It is proposed in this work that solid-liquid composite coatings can be prepared by utilizing the defects such as pores and microcracks inherent in thermal spray coatings for introducing solid lubricating phases and liquid lubricating phases. This strategy addresses the issue of degradation of the mechanical properties of conventional ceramic-based self-lubricating coatings due to their tribological design.

Synergistic lubrication effects of Sn–Ag–Cu and MXene–Ti3C2 to improve tribological properties of M50 bearing steel with microporous channels

Purpose This paper aims to study the synergistic lubrication effects of Sn–Ag–Cu and MXene–Ti3C2 to improve the tribological properties of M50 bearing steel with microporous channels. Design/methodology/approach M50 matrix self-lubricating composites (MMSC) were designed and prepared by filling Sn–Ag–Cu and MXene–Ti3C2 in the microporous channels of M50 bearing steel. The tribology performance testing of as-prepared samples was executed with a multifunction tribometer. The optimum hole size and lubricant content, as well as self-lubricating mechanism of MMSC, were studied. Findings The tribological properties of MMSC are strongly dependent on the synergistic lubrication effect of MXene–Ti3C2 and Sn–Ag–Cu. When the hole size of microchannel is 1 mm and the content of MXene–Ti3C2 in mixed lubricant is 4 wt.%, MMSC shows the lowest friction coefficient and wear rate. The Sn–Ag–Cu and MXene–Ti3C2 are extruded from the microporous channels and spread to the friction interface, and a relatively complete lubricating film is formed at the friction interface. Meanwhile, the synergistic lubrication of Sn–Ag–Cu and MXene–Ti3C2 can improve the stability of the lubricating film, thus the excellent tribological property of MMSC is obtained. Originality/value The results help in deep understanding of the synergistic lubrication effects of Sn–Ag–Cu and MXene–Ti3C2 on the tribological properties of M50 bearing steel. This work also provides a useful reference for the tribological design of mechanical components by combining surface texture with solid lubrication. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0381/

Self-lubricating performance of a grinding wheel filled with CNTs@T304 nano-capsules

This paper introduces a new grinding wheel which lubricates the grinding area directly. This is achieved by filling a resin grinding wheel with nano-capsules comprised of carbon nanotubes (CNTs) and di-n-butyl phosphite (T304) (CNTs@T304). The CNTs@T304 nano-capsules filled grinding wheel reduces the grinding force, lowers the grinding temperature, and improves the workpiece surface quality. The T304 lubricant is first filled into the CNT cavity to prepare nano-capsules, which exhibit better friction and wear quality than CNTs. Then the paper analyzes the configuration of the nano-capsules in the grinding wheel, together with the investigation of how the filling content impacts the mechanical properties. Additionally, the effects of nano-capsule filling content and grinding parameters on grinding force, grinding temperature, grinding ratio, as well as workpiece surface roughness are studied and the self-lubricating mechanism of the nano-capsules is assessed. According to the experimental results, nano-capsules maintain stable under thermal condition and resist the curing temperature. Moreover, the tensile strength and hardness exhibited by the grinding wheel still meet the application requirements at a filling content <16 wt%. Compared with the grinding wheel without fillers, the nano-capsule filled wheel exhibits superior grinding performance, with a 33 % reduction in the grinding force. Also, the grinding temperature is 28 % lower, there is a 30 % improvement in the grinding ratio, and the workpiece surface quality increases by 35 % under the same conditions. The T304 in the nano-capsules is continually released onto the grinding interface with the wear of the wheel in the grinding process, which forms a self-lubricating layer along with the friction products of the CNTs. This exerts an outstanding anti-friction and anti-wear effect, thereby improving the grinding performance.

Self-Lubricating Properties of Polyether-Ether-Ketone Composites Filled with CNTs@RC2540 Nano-Capsules

Polyether-ether-ketone (PEEK) exhibits great potential in being a replacement for metal components across various applications relying on the mechanical and tribological properties. However, there is still much to be done to improve its properties. The main motivation of this paper is to improve the tribological and mechanical properties of PEEK simultaneously for more severe working environment. Therefore, dialkyl pentasulfide (RC2540) was proposed to fill into the cavity of CNTs to prepare nano-capsules, which were then filled into PEEK to prepare PEEK/nano-capsules composites. The existence of nano-capsules in PEEK was analyzed, and the friction and wear properties exhibited by PEEK composites against GCr15 steel were examined using pin-disk friction pairs, and the self-lubricating mechanism of PEEK composites in friction was revealed. Findings of this study indicated that when the mass fraction of nano-capsules was less than 5%, the filling of nano-capsules could improve the tensile strength of PEEK and reduced the friction coefficient and specific wear rate of PEEK by filling nano-capsules. During the friction process, RC2540 in the nano-capsules can be released as PEEK wears so that a self-lubricating layer can be formed for reducing PEEK composites’ friction and wear.

Unraveling Tribochemistry and Self-Lubrication Mechanism of Polytetrafluoroethylene by Reactive Coarse-Grained Molecular Dynamics Simulations.

Lubrication of polymeric materials generally involves processes of atomic-scale chemical bond forming/breaking at the interface and mesoscale chain reorientation, disentanglement, and so forth. However, it is difficult to describe the important aspects of tribochemical reactions by conventional coarse-grained molecular dynamics (CGMD) simulations. Here, reactive CGMD simulations were conducted based on the ReaxFF force field to study the tribochemical interactions between polytetrafluoroethylene (PTFE) and iron. The chemical bond forming/breaking between the molecular chain and countersurface was fitted through the bond dissociation energies of specific reaction sites from all-atom ReaxFF-MD simulations. This enabled a quantitative description of tribochemical reactions in a macromolecule system. First, the number of anchoring bonds between PTFE molecules and the countersurface showed a strong correlation with the friction coefficient. The shearing process induced breaking of the interfacial anchoring bonds as well as chain disentanglement in the matrix, which consequently led to ordering reorientation of molecular chains toward sliding direction and hence decrease of friction. Second, two competitive factors were clarified to affect polymer friction with varying temperatures. The decrease of interfacial anchoring reactivity and molecular chain mobility at low temperature prohibited reorientation of molecular chains and increased the friction coefficient. On the other hand, the hardening of PTFE and the reduction in effective contact area at low temperatures decreased the friction coefficient. This led to a turning point with a maximum friction coefficient around 100 K. These results shed light on the essential role of tribochemical reactions on polymer lubrication, especially under low temperatures, which provides design guidance of polymeric lubrication systems for engineering applications.

Tribological properties of graphene/β-Si3N4 whisker reinforced Si3N4 ceramic composites

Exploring ceramic-based self-lubricating materials with low coefficient of friction (COF) has become one of the hot directions to advance the service performance and life of high-end equipment. In this work, the tribological properties of multilayer graphene (MLG)/β-Si3N4 whisker (β-Si3N4w)/Si3N4 ceramics were investigated. The effects of load and linear speed on the dry sliding COF were discussed. The friction-reducing and self-lubricating mechanisms of MLG and β-Si3N4w were deeply analyzed according to the wear morphology and mechanical properties of Si3N4-based ceramics. The friction frequency was proposed to analyze the wear mechanism. Results indicated that MLG and β-Si3N4w led to a breakthrough reduction in COF. At the load of 5–20 N, the COF reached an ultra-low level of 0.04–0.07, which was a further 89.86% lower than the reported studies. The comprehensive enhancement of mechanical properties and the existence of MLG lubricating film were the mainly responsible for the ultra-low COF. The COF of MLG/β-Si3N4w/Si3N4 ceramics raised to 0.24–0.31 at 50–200 mm/s, but it was still 33.88–47.64% lower than that of graphene/Si3N4 ceramics. The increase in COF was attributed to the high wear induced by the raised friction frequency. The furrow wear and adhesive wear were the main wear forms of MLG/β-Si3N4w/Si3N4 ceramics.

Polydopamine-modified polysulfone/silica double-walled heat-resistant microcapsules efficiently improve the tribological properties of polyamides

The tribological properties of nylon 6 (PA6) play an important role in regulating the energy consumption, component integrity, and reliability of construction machinery. In order to improve the tribological properties of polyamide, by using high temperature resistant green lubricant ionic liquid (IL) lubricant as core material and polysulfone (PSF) and SiO2 hybrid system as wall materials, double-walled IL@PSF/SiO2 self-lubricating microcapsules with high core content has been prepared. By exploring different emulsifiers and different agitation rates, the degree of encapsulation of an ionic liquid (IL) has been improved and the optimal synthesis conditions for microcapsules have been determined. And the core content was as high as 68 wt% The introduction of SiO2 in the wall material increased the thermal softening temperature of the microcapsules up to 400 °C. The friction coefficient and specific wear loss of a PA6 composite containing 10 wt% IL-loaded microcapsules were reduced by 82% and 87.9% comparing with pure PA6, respectively. The self-lubrication mechanism has been investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and atomic force microscope (AFM), and the results showed the formation of a uniform, continuous, and thin boundary lubricating film on the wear surface to be the main reason for the improved tribological performance.

Tribological properties and synergetic self-lubricating mechanism of PS-PAO based nanocapsules with MoDTC addtives

With development of encapsulation technology, analysis of dependent nano-scaled microcapsule is significant to intensively understand self-lubrication behavior. In this paper, polystyrene (PS)-poly alpha olefin (PAO) capsules were synthesized with PAO as core and PS as shell. The diameter, shell thickness and encapsulated rate of PS-PAO4 were 381.51 ± 25.44 nm, 40 nm and 43.29 wt.%. The friction coefficient (COF) of PS-PAO4 by SRV friction test was 0.089, which played intermediate between PS nanosphere and PAO oil. Comprehensive analysis with Hamrock-Dowson equation and classical Stribeck curve manifested that the PS-PAO nanocapsules and PS nanospheres stayed in mixed lubrication regime, and PAO oil stayed in the boundary lubrication regime. Due to the absence of lubrication, PS dry friction and asperities contact status were more significant to determine the lubrication state of PS-PAO4 sample. The influence factors including load, operating temperature, PAO types and molybdenum dithiocarbamate (MoDTC) addtives were respectively investigated. A three-stage decline curve of PS-PAO4/MoDTC was found with final COF of 0.015, which the COF value decreased by 83.15% compared by PS-PAO4. The synergetic self-lubricating mechanism was mainly determined by asperity contacts, PS debris grinding, FeS tribofilm formation of MoDTC additives and counterparts, transfer film and third body formation by PS, MoDTC, PAO oil and counterparts. This work provides intensive understanding of nanocapsules for mixed lubrication regime and is expected to apply in ultrathin coating, liquid lubricant additives and functional polishing abrasives under heavy-duty and low speed conditions.

Frictional behavior and wear mechanisms of Ag/MoS2/WS2 composite under reciprocating microscale sliding

Silver matrix composites are known for their low friction coefficient and high wear resistance, making them promising for various practical applications. In this study, we investigate the frictional behavior and wear mechanisms of Ag/MoS2/WS2 composite using a nano-scratcher, SEM, 3D profilometer, and XPS. The wear mechanisms under different loads and sliding distances were investigated by scuffing tests, and the results showed that the incorporation of MoS2 and WS2 improved the friction reduction performance of the composites. The friction coefficient decreases from 0.32 to 0.14 under a normal load of 400 mN and a sliding distance of 1000 cycles. The wear mechanism changes from scratch wear to scratch/fatigue wear with increasing load and number of cycles. The friction model proposed explains the mechanism of the composite and determines the adhesion and plowing components of the friction coefficient. The self-lubricating mechanism of the composite is effective in reducing the plowing component of the friction coefficient. This study provides valuable insights into the microscopic frictional behavior and wears mechanisms of Ag/MoS2/WS2 composites and lays a foundation for their practical application in microscopic reciprocal sliding friction processes.

Friction Behavior and Self-Lubricating Mechanism of SLD-MAGIC Cold Worked Die Steel during Different Wear Conditions

Wear tends to shorten tool life, reduce component quality. To prevent or postpone the wear of tool steel forming tools, methods to increase wear resistance, such as increasing the material hardness, optimizing the carbide distribution and application of surface coatings, are often used. However, the formation of lubricating phases in steels leading to anti-attrition is less investigated. The friction behavior of three steels were investigated thoroughly by a tribo test with different normal loads. A Field-emission scanning electron microscope (FE-SEM) along with energy dispersive X-ray spectroscopy (EDS) were used to characterize the microstructure as well as the influence of the precipitated phases on the wear mechanisms. Results showed the friction coefficient decreased with increasing normal load, whereas the wear rate increased with increasing normal load. Compared with SKD11 and DC53 steels, the friction coefficient and wear volume of SLD-MAGIC steel were reduced by 0.1 to 0.3 and 10% to 30%, respectively. With the increase of normal load, the wear mechanism changed in order from abrasive wear, adhesive wear to oxidation wear. The more carbide contents, the rounder the carbide, the better the wear resistance of the tool steel. It can be shown that, under different normal loads, SLD-MAGIC exhibits better wear performance than SKD11 and DC53 tool steels, which is mainly due to the self-lubricating phenomenon of SLD-MAGIC steel. The self-lubricating mechanism was due to the fact that the exfoliated sulfide during wear formed a lubricating film to reduce wear.

Mechanism of thermoviscoelasticity driven solid-liquid interface reducing friction for polymer alloy coating

High-temperature ablation is a common failure phenomenon that limits the service life of the transmission parts on heavy-duty machines used in heavy load, high temperature, high shock conditions due to in-sufficient supply of lubricating oil and grease. Traditional self-lubricating coatings prepared by inorganic, organic or organic-inorganic hybrid methods are prone to be oxidated at high temperatures to lose their friction reducing function, so that it is difficult to meet the engineering requirements of high-temperature lubrication. We design viscoelastic polymer coatings by a high-temperature self-lubricating and wear-resistant strategy. Polytetrafluoroethylene (PTFE, Tm = 329 °C) and polyphenylene sulfide (PPS, Tg = 84 °C, Tm = 283 °C) are used to prepare a PTFE/PPS polymer alloy coating. As the temperature increases from 25 to 300 °C, the PTFE/PPS coating softens from glass state to viscoelastic state and viscous flow state, which is owing to the thermodynamic transformation characteristic of the PPS component. Additionally the friction coefficient (µ) decreased from 0.096 to 0.042 with the increasing of temperature from 25 to 300 °C. The mechanism of mechanical deformation and surface morphology evolution for the PTFE/PPS coating under the multi-field coupling action of temperature (T), temperature-centrifugal force (T-Fω), temperature-centrifugal force-shearing force (T-Fω-Fτ) were investigated. The physical model of “thermoviscoelasticity driven solid-liquid interface reducing friction” is proposed to clarify the self-lubricating mechanism determined by the high-temperature viscoelastic properties of polymers. The high-temperature adjusts the viscosity (η) of the coating, increases interface slipping and intensifies shear deformation (τ), reducing the friction coefficient. The result is expected to provide a new idea for designing anti-ablation coatings served in high temperature friction and wear conditions.

Novel insight into the self-lubricating mechanism of Cu–Pb bearing alloy during sliding friction with the guidance of molecular dynamics

The self-lubricating mechanism of Cu–Pb bearing alloy is discussed by molecular dynamics (MD). MD friction tests are conducted on the pure Cu and Cu–Pb models. The Pb-rich secondary phases (PSPs) melt due to the frictional heat. The solid–liquid phase transition of Pb is characterized by the radial distribution function (RDF) and the potential energy. An obvious drop of motion resistance of the abrasive debris is observed in Cu–Pb alloy once the debris moves close to the soft PSP which protect the matrix from abrasion by embedding the debris and promoting the formation of a liquid lubricant film. The synchrotron radiation technology is employed to in-situ observe the phase transition of Pb, and the MD results match the experimental results well.

A novel CoCrNi/W/Agx medium-entropy alloy matrix composite reinforced by Ag nanoparticle and self-lubricating mechanism under ambient air and high vacuum conditions

The present work aims to synthesize the CoCrNi/W/Agx composites with the high wear-resistance under ambient air and vacuum conditions. The friction and wear properties of the CoCrNi/W/Agx composites and CoCrNi medium entropy alloy were fully evaluated, and the chemical components and microstructural evolution of the tribo-films were observed and analyzed by X-ray photoelectron spectroscopy and scanning electron microscopy. The self-lubricating mechanism of the CoCrNi/W/Agx composites under ambient air and vacuum conditions was investigated. Increasing the Ag content increased the thickness of the tribo-films improving the friction and wear properties of the alloys, and the thickness of the tribo-films formed on the worn surface of the CoCrNi/W/Ag1.0 composite was about 150 nm. The CoCrNi/W/Ag1.0 composite exhibited an evident improvement in tribological performance, with a high wear-resistance of 2.79 × 10−5 mm3/N·m under vacuum condition and a volumetric wear rate as low as 1.35 × 10−5 mm3/N·m under ambient air condition.

Tribosynthesis of friction films and their influence on the functional properties of copper-based antifriction composites for printing machines

Abstract This article is devoted to research of the tribosynthesis mechanism of antifriction films and their influence on the functional properties of antifriction composites based on copper alloyed with nickel and molybdenum with the CaF2 solid lubricant additions for operation at rotation speeds of 3,000–7,000 rph and increased loads of 3.0–5.0 MPa in air. Studies have shown that antifriction films are complex, dynamically changing formations on the surfaces of the composite and counterface, developing according to the bifurcation mechanism. The antifriction layer is decisive in the formation of the friction pair's tribological high-level properties, which provide the self-lubrication mode of the friction unit. The formation and permanent presence of the anti-seize film is associated with a balanced wear rate of the film and its constant formation again on these worn areas at rotation speeds of up to 7,000 rph and loads of up to 5.0 MPa. Due to the steady self-lubrication mechanism, the copper-based composite has significant advantages over cast bronze CuSn5ZnPb, which can only work with liquid lubrication in the friction units of printing machines. The performed studies make it possible to choose rational modes for operation of new high-speed antifriction Cu-composites based on the friction films analysis, predicting their high functional properties.

Facile preparation of high-temperature-resistant ionic liquid@porous hollow glass microcapsules for self-lubricating PA6 composites

A novel type of ionic liquid-loaded microcapsules with high loading capacity and high temperature resistance were fabricated by a facile environmentally friendly microencapsulation. Porous hollow glass bubbles were prepared by a subcritical water treatment method and used as microcontainers. The formation process of porous structure and the relationship between the morphology of the porous hollow glass bubbles and the subcritical treatment conditions were studied in detail. 1-propyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl) imide ionic liquid (PMImNTf2 IL) was selected as a lubricant, and IL@porous hollow glass bubbles microcapsules were prepared by simple physical impregnation. The average diameter and wall thickness of microcapsules were 20 µm and 0.6 µm, respectively, and the loading capacity of IL therein was 68.4 wt%. The prepared IL@porous hollow glass microcapsules shown high temperature resistance, with an initial thermal decomposition temperature of 340 ℃. The tribological properties of self-lubricating PA6 composites with different contents of the microcapsules were evaluated under different friction temperature. At room temperature, the friction coefficient and wear rate of the PA6 composites containing 15 wt% microcapsules were reduced by 73.3 % and 92.8 %, respectively, and the excellent friction resistance was maintained below 100 ℃. The macro and micro morphologies of wear surfaces were observed and analyzed to reveal the self-lubricating mechanism of PA6 composites.