TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Shanshan Li,Chuanping Gao,Chunjian Duan,Shengmao Zhang,Pingyu Zhang,Zhijun Zhang
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.
研究领域:
材料科学
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摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Rui Guo,Xiaochen Wang,Di Liu,Song Hu,Zhengwei Lin,Yang Lyu,Xiaolong Wang
The global challenge of friction-induced energy dissipation in mechanical systems drives the demand for high-performance polymers with superior tribological properties. Poly(ether ether ketone) (PEEK) is a promising high-performance polymer for lightweight robots, yet its use in moving components is hindered by poor lubricity, high wear rate, and limited processability. Here, we adopted a facile tactic to fabricate a PEEK-based composite by filling polytetrafluoroethylene (PTFE) micropowders through material extrusion 3D printing. This composite enables the rapid prototyping of complex architectures with high printing resolution at the micrometer scale, providing excellent mechanical toughness and superior tribological properties. Specifically, the printed composite with 7.5 wt% PTFE showed the high-quality microstructure (PTFE size below 5 µm), excellent impact strength up to 81.72 kJ/m 2 , and high crystallinity of PEEK phase up to 29.24%. The resultant composite achieved the synergistic enhancement of lubricating and anti-wear properties at various loads (30–100 N), which was attributed to the lubricative transferred film led by PTFE. The average friction coefficient was remained at approximately 0.1 under various loads, with a minimum wear rate of 2.72 × 10 −5 mm 3 /(N∙m) at 50 N. To reveal the potentials, the porous oil-containing material, bearing and car differential are demonstrated by 3D printing. This printed PEEK/PTFE composite paves the way for enhancing the tribological performances and manufacturing flexibility in polymers, advancing the development of PEEK materials in high-precision transmission devices.
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Jiajia Cen,Shuangqi Li,Kai Chen,Dekun Zhang
Polyetheretherketone (PEEK) possesses excellent corrosion resistance, moderate friction properties, and high‑temperature stability. However, under severe operating conditions, its coefficient of friction (COF) and wear rate increase significantly, limiting broader application. In this work, P‑MoS₂ was synthesized in situ on a PEEK matrix using a hydrothermal method, while K‑BN‑OH was prepared via surface grafting with a coupling agent. Both fillers were then blended with a PEEK/PTFE matrix to produce a novel PEEK/PTFE/P‑MoS₂/K‑BN‑OH composite. Orthogonal experiments identified the optimal composition of PEEK/PTFE/P‑MoS₂, which exhibited the best overall performance. The effect of K‑BN‑OH content on the mechanical, thermal, and tribological properties of the composites was systematically studied. Tribological behavior under varying conditions was analyzed to elucidate wear mechanisms and filler synergy. Results show that the composite with 25% PTFE and 5% P‑MoS₂ achieved the most balanced performance: elastic modulus (1414.62 MPa), compressive strength (127.81 MPa), COF (0.108), and wear rate (1.81 ×10⁻⁶ mm³/N·h) decreased by 22.58%, 35.82%, 73.13%, and 59.78%, respectively, compared to pure PEEK, while creep strain (2.77%) increased by 95.62%. Further addition of 3% K‑BN‑OH enhanced mechanical and thermal properties: elastic modulus rose to 1520.13 MPa, compressive strength to 131.33 MPa, creep strain fell to 1.82%, and thermal conductivity reached 0.294 W/m·K. The average coefficient of friction(ACOF) declined to 0.094, though wear rate rose slightly to 2.26 × 10⁻⁶ mm³/N·h. Tribological tests revealed that wear rate increased with rotational speed, while ACOF showed a non‑monotonic trend, first decreasing and then increasing. With increasing load, both ACOF and wear rate initially decreased before rising, reaching minima at 20 N (0.077 and 2.09 ×10⁻⁶ mm³/N·h, respectively). Molecular dynamics simulations elucidated that PTFE formed a lubricating film through interfacial enrichment, while MoS₂ enhanced matrix ordering and promoted interfacial slip via π-π stacking and C-S bonding. In contrast, h-BN disrupted the synergistic lubrication network established between PTFE and MoS₂ due to its spatial blocking effect. This work systematically elucidates the synergistic mechanisms of fillers from the microscopic level to macroscopic performance, providing a theoretical basis for the design of high‑performance PEEK composites tailored to specific operating conditions.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Shuojie Cui,Yanru Hu,Lihui Meng,Zilin Zhou,Meng Wang,Panwen Liu,Yilin Yang,Moyuan Qu,Qingzhi Wu
The temporomandibular joint disc (TMJD) lacks intrinsic regenerative capacity, and to date, no effective or durable clinical treatments exist for its repair, presenting a major challenge in medical practice. In this study, a facile strategy has been developed to fabricate poly(ether-ether-ketone) (PEEK)/polytetrafluoroethylene (PTFE)@ polydopamine (PDA) composites with good biocompatibility and wear-resistant properties for TMJD replacement and repair. Biocompatible PDA molecules are introduced to improve interfacial affinity between PEEK and PTFE molecules. The results show that the mechanical properties of as-prepared PEEK/PTFE@PDA composite are adjusted to be close to those of TMJD. The tensile strength, compressive strength, and flexural strength of PEEK/PTFE@PDA composite are 73.63 ± 0.69 MPa, 63.28 ± 15.83 MPa, and 81.10 ± 3.80 MPa, respectively. Furthermore, the friction coefficient and wear rate of PEEK/PTFE@PDA composite are 0.041 and 3.54 × 10 -7 mm³/Nm, which are reduced by 81.4% and 42.7% than those of PEEK, respectively. The antibacterial rates of PEEK/PTFE@PDA composite against Gram-positive bacteria ( Staphylococcus aureus ) and Gram-negative bacteria ( Escherichia coli ) is 99.6 ± 0.1% and 92.5 ± 0.2% under near-infrared laser irradiation, respectively. This study paves the way for the application of PEEK-based composites in maxillofacial implants and provides a new strategy for solving temporomandibular joint disorder.
研究领域:
生物材料
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生物医学工程
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材料科学
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牙科
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组织工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）