CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Naner Li,Chaobao Wang,Zhenghao Ge,Xinqi Zou,Xiaoqian Weng
Water has many natural advantages for using as an ecological lubricant in engineering. However, how to ensure the efficiency and stability of water lubricating film with low viscosity has been always the key point of practical applications. For this, a strategy is given to improve lubricating capacity of water under loads by combining the biomimetic adhesion and hydration lubrication of polydopamine (PDA). The PDA nanoparticles were polymerized and purified, and its aqueous suspensions were used to solve the difficult problem of lubrication failure when using water as lubricant. The morphology characteristics and lubrication performance of PDA nanoparticles were experimentally tested and analyzed. The results showed that PDA nanoparticles can form an adhesive-lubricating film on the copper balls and effectively reduce the tribological behaviors in rubbing processes. This strategy that combines the biomimetic adhesion and hydration lubrication of PDA provides a novel method to realize targeted hydrated film and excellent water lubrication under load bearing conditions.
研究领域:
材料科学
·
生物仿生学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Songfeng E,Xiangyuan Ye,Meigui Wang,Jizhen Huang,Qin Ma,Zhanfan Jin,Doudou Ning,Zhaoqing Lu
Boron nitride (BN) shows obvious anti-wear performance as additives in lubricants, ceramics and polymers, however, the strong interlayer interactions lead to the weak anti-friction effect compared to those of carbon-based materials. In this work, we obtained the hydroxylated BN (BNO) via annealing the bulk material in air at high temperature. Utilizing the self-polymerization reactions of dopamine (DA) on the hydroxyls of BNO, the polydopamine (PDA) modified BNO (BNO-PDA) was formed, which has a good dispersity in water. The tribological tests indicate that both the hydroxylation and PDA modification can effectively lower the coefficient of friction (COF) and wear rate of the BN as additives in water, but the letter seems to present lower COF values when the testing time is increased. We also studied the influence of polymerization time on the tribological behaviors of BNO-PDA, and it was concluded that the 6 h modification gained the lowest wear rate and the 24 h modification yielded the lowest average COF value. It is believed that the favorable tribological performance of BNO-PDA as additives in water lubrication is resulted from the improved dispersity and the formation of organic layers on the surface of BN.
研究领域:
材料科学
·
生物仿生学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Friction
·
2021
·Vol. 10
·期 3
·398-410
·
IF 6.167
Cheng Hao,Zhao Wenjie
Novel two-dimensional (2D) Nb 2 C nanosheets were successfully prepared through a simple lultrasonic and magnetic stirring treatment from the original accordion-like powder. To further study their water-lubrication properties and deal with common oxidation problems, Nb2C nanosheets with different oxidation degrees were prepared and achieved long-term stability in deionized water. Scanning electron microscope (SEM), transmission electron microscope (TEM), scanning probe microscope (SPM), X-ray powder diffraction (XRD), Raman, and X-ray photoelectron spectrometer (XPS) experiments were utilized to characterize the structure, morphology, and dispersion of Nb 2 C nanosheets with different degrees of oxidation. The tribological behaviors of Nb 2 C with different degrees of oxidation as additives for water lubrication were characterized using a UMT-3 friction testing machine. The wear scars formed on the 316 steel surface were measured using three-dimensional (3D) laser scanning confocal microscopy. The tribological results showed that a moderately oxidized Nb 2 C nanosheet, which owned the composition of Nb 2 C/Nb 2 O 5 /C, displayed excellent tribological performance, with the friction coefficient (COF) decreasing by 90.3% and a decrease in the wear rate by 73.1% compared with pure water. Combining the TEM and Raman spectra, it was shown that Nb 2 O 5 nanoparticles filled in the worn zone, and the layered Nb 2 C and C were adsorbed into the surface of the friction pair to form a protective lubricating film. This combined action resulted in an excellent lubricating performance.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 15
·期 1
·62
·
IF 3.623
Ying Liu,Gengyuan Gao,Dan Jiang,Zhongwei Yin
This paper studied a hybrid polytetrafluoroethylene (PTFE)/Nomex fabric composite with lower friction coefficient (COF) and high underwater wear resistance. A pin-on-disk tribometer was used to test tribological properties under different applied loads and rotation speeds. The wear surface, transfer film and cross-section were analyzed by scanning electron microscope (SEM) and optical microscope. The results showed enhanced underwater tribological properties because of excellent self-lubricating properties of PTFE fibers and a good lubricating effect and load-carrying capacity of graphite fillers. Improved underwater mechanical strength was connected to the high strength of epoxy resin and high bonding force between Nomex and epoxy resin.Keywords:fabric composite;epoxy;graphite;friction and wear;water-lubricated
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Tao Li,Min Zhang,Renjie Li,Yunsong Kong,Xiaoduo Zhao,Le Ji,Weiyi Zhao,Bin Li,Shuanhong Ma
To minimize friction when silicone-based medical devices interact with soft tissues, coating their hydrophobic surfaces with lubricants has become a widely adopted method. In this study, a vesicle-like polysaccharide derivative biolubricant (HPC-PSBMA) is synthesized by combining hydrophilic monomers with hydroxypropyl cellulose (HPC) as the main chain. HPC-PSBMA exhibits good dispersibility in water, and it can be adsorbed onto the surface of silicone rubber. By integrating molecular dynamics simulations with experimental data, the adsorption and film-forming mechanisms are uncovered. Furthermore, HPC-PSBMA showed a lower coefficient of friction (COF∼0.02) on the surface of urinary catheters when compared with commercially available lubricants (COF∼0.05). Consequently, this work offers a novel approach to improving surface lubrication of hydrophobic medical devices with broad potential applications.
研究领域:
生物材料
·
医学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 11
·5667-5681
·
IF 2.3
Dong Shengkang,Guo Zhiwei,Zang Hongshuang,Yuan Chengqing
Polytetrafluoroethylene (PTFE) has great potential for applications in water-lubricated bearings; however, in heavy load conditions at low speeds, PTFE suffers from severe friction and abrasion because of its poor wear resistance. In this study, silicon carbide (SiC) content and particle size are investigated in relation to PTFE water-lubricated composites' tribological properties. The results show that the wear resistance of PTFE composites can be significantly improved when the filling amount of SiC particles was between 3 and 5 wt.%, and the composites containing 5 wt.% SiC reduced wear loss by 99.44%. The composites' friction and wear properties decreased as SiC particle size increased, and wear mechanism for the composites shifted from adhesive to abrasive. Wear loss on PTFE composites filled with 40 nm SiC particles was reduced by 97.03%, showing the best wear resistance. This study provides an experimental basis for the development of high-performance PTFE water-lubricated bearings.
研究领域:
材料科学
·
机械工程
·
摩擦学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2024
·
IF 4.9
Zhao Zhaojun,Yang Zhuo,Zhang Xingmin,Sun Yaqian,Wang Qingmiao,Zhou Hang,Min Jie
Lyocell fibers are currently claimed as green fibers with good application prospects, but the major problem of fibrillation restricts further promotion and application. In this study, based on the theory of hydration lubrication at the solid/liquid interface, hexamethylene-diisocyanate trimer (HDIt), polyethylene glycol (PEG), and butanone oxime (MEKO) were used to synthesize a reactive hydrophilic triblock polyurethane (RHT-PU). RHT-PU could construct a water lubrication layer on the lyocell fiber surface via H-bonding between polyoxyethylene ether and water molecules, reducing the coefficient of friction (CoF) of the fiber interface in the water. It was found that PEG molecular weight and grafting density had significant effects on the CoF of modified fabrics, with CoFs decreased with increased PEG molecular weight and grafting density. In water, the CoFs of fabrics modified by RHT-PU were reduced from 0.45 to 0.32 and maintained lower CoFs at higher temperature and higher normal loads. After mechanical friction and household washing tests, the surface abrasion of modified fabrics were significantly improved and color fading grade of fabrics raised from 3 grade to 4–5 grade. Construction of water-lubricated interfaces effectively reduced fibrillation.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Friction
·
2024
·Vol. 12
·期 8
·1801-1815
·
IF 6.3
Jiang Shaoli,Wong Janet S. S.,Puhan Debashis,Yuan Tian,Bai Xiuqin,Yuan Chengqing
Polymers are widely used in bearing applications. In the case of water-lubricated stern tube bearings, thermoplastic polyurethane (TPU)-based composites are used due to their excellent wear resistance, corrosion resistance, and tunable mechanical properties. Their tribological performance, however, depends on operating conditions. In this work, TPU was blended with carbon fiber, graphene platelet, and ultra-high molecular weight polyethylene (UHMWPE). Friction tests of TPU based-composites against copper countersurface were carried out in water to mimic the actual operating conditions of the bearing. Most of the resulting contacts were in the boundary lubrication regime, in which friction was attributed to both contact mechanics of asperities as well as water lubrication. Our results show that the viscoelasticity of TPU has a considerable impact on its tribological performance. Water lubrication at 50 °C promotes the softening of polymer surface material during sliding, resulting in higher fluctuation in the coefficient of friction and wear loss. This is attributed to the reduced thermomechanical properties. In addition, Schallamach waviness is observed on worn surface. The tribological properties of TPU are significantly improved by the inclusion of carbon fiber, graphene platelet, and UHMWPE. The formation of graphene transfer-layers and UHMWPE transfer film reduces friction and wear loss, while the inclusion of carbon fiber enhances wear resistance due to improved mechanical properties and load bearing capacity.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Na Wang,Honggang Wang,Junfang Ren,Gui Gao,Shengsheng Chen,Gengrui Zhao,Yawen Yang,Jinqing Wang
In order to solve the problems of poor dispersibility and wettability, as well as unsatisfactory wear resistance and load capacity of polytetrafluoroethylene (PTFE) as water lubricating additive, a new type of PTFE@silica (PTFE@SiO 2 ) core-shell nanoparticles was prepared by encapsulating SiO 2 layer on the surface of PTFE via chemical bonding. Electron microscope analysis showed that the synthesized particles had well-defined core-shell morphology. Special double/multi-core structure and a reduced thickness of the intermediate shell were found, and the formation mechanisms were also explored in detail. The water contact angle measurement proved that the wettability of PTFE could be greatly enhanced by coating SiO 2 layer. The friction tests were performed to investigate the water lubrication properties of PTFE@SiO 2 additive, the results indicated that the core-shell PTFE@SiO 2 nanoparticles possessed the superior tribological properties, and the maximum friction coefficient and wear volume were respectively decreased by 75% and 99% when compared with pure water and water with PTFE/SiO 2 . Based on the analysis of worn surface, it was believed that the existence of core-shell structure and the formation of robust transfer film were the key to its excellent performance, and a possible lubrication mechanism was also proposed.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2023
·
IF 5
Hujun Wang,Haonan Qiu,Wei Liu,Lulin Tian,Jing Zheng,Zhihui Zhang,Zhongrong Zhou
Surface texturing is a promising way to reduce wear, but further improvements in wear resistance via single textures remain challenging. Inspired by multiple biological surfaces, we design and prepare two microtextures (MTs) on AISI 440C steel by femtosecond laser and then construct superhydrophobic micro/nanostructures in the MTs to obtain two multi-bioinspired hierarchical textures (MHTs). The MHTs show significant wear resistance under relatively low loads and high frequencies. Remarkably, compared with polished surfaces, the wear rates of the dimple-shaped MHTs (DMHTs) and the groove-shaped MHTs decrease by 64.6% and 50.0%, respectively. The introduction of the superhydrophobic micro/nanostructures enables the maximum wear reduction rate of the DMHTs 121.2% higher than that of the corresponding single textures. The wear resistance of the MHTs originates from the synergetic effects (manifested by the increases in surface hardness and hydro-dynamic pressure) of the laser-ablated MTs and superhydrophobic micro/nanostructures. We envision that this work will inspire the design and fabrication of more multi-bioinspired textures to achieve further improvements in wear resistance of mechanical parts under water lubrication .
研究领域:
材料科学
·
表面工程
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Shaoli Jiang,Debashis Puhan,Jian Huang,Zongrong Yang,Liyuan Zhang,Tian Yuan,Xiuqin Bai,Chengqing Yuan
For water-lubricated stern tube bearing in ships, bearing material with low friction can prevent severe damage on the shaft surface when lubrication failure occurs, and hence improve operation reliability of the whole propeller system. In this work, 0.25–5 wt% of solid lubricant graphene platelets were blended with commonly used bearing matrix thermoplastic polyurethane (TPU) via melting injection, and tribological performance of TPU composites were investigated at a set of applied loads and sliding speeds which mimics the actual operating conditions. Graphene inclusion at a low content (< 0.5 wt%) reduced friction and wear compared to neat TPU, while maintaining mechanical properties. Graphene-induced tribofilm is formed and it is believed to offer low shear strength at the sliding surfaces while also regulating the size of wear particles. Since more platelets are exfoliated due to the greater extent of surface damage under high loads, it presents a pressure-dependent anti-friction ability. Higher concentration of graphene led to further friction reduction but deteriorated both the strength and ductility of materials due to the agglomeration. Results from Raman spectroscopies show that graphene-reinforced TPU composites underwent no chemical changes but mechanical deformation during rubbing, and this resulted in wear particles and tribofilm, containing graphene platelets with modified structure.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Yonggang Guo,Yunfei Wu,Jiangbo Peng
In this study, a novel composite material has been prepared, which is composed of ultra-high molecular weight polyethylene (UHMWPE) with a small amount of polyimide (PI). The friction behavior of composites under dynamic speed and load conditions was investigated using a MDW-02G friction and wear testing machine. The frictional behavior of composites under low-speed with heavy-load (LSHL) dry friction and high-speed with light-load (HSLL) water lubrication conditions was studied separately. The tribological performance of the composites was analyzed on the basis of the coefficient of friction, wear rate, and wear morphology. The experimental results showed that the addition of PI enhances the thermal stability of UHMWPE-based composites. The defects of the UHMWPE surface vulnerable to fatigue wear under extreme working conditions were improved. Compared with UHMWPE, the wettability of PI modified composites was enhanced, and the lubricating film formed could better adhere to the friction interface. This effectively improved the lubrication conditions between the friction interfaces, while improving the wear resistance and reducing the coefficient of friction. It can be concluded that the thermal stability and wear resistance of UHMWPE-based water-lubricated bearings can be improved by a small proportion of PI enhancement, while ensuring that the composite material also has good self-lubricating properties. Highlights Low PI content enhances the thermal properties and wear resistance of composites. Under LSHL conditions, the wear rate in the composite can decrease by up to 93%. The wear mechanism of composites under LSHL and HSLL conditions was revealed.
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）