PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 44
·27406-27412
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IF 3.945
Xuan Yin,Haohao Chen,Lai Jiang,Chang Liang,Haosheng Pang,Dameng Liu,Bing Zhang
Two modified V2C-MXene nanocoatings are prepared through different molecular weights of polyacrylic acid (polyacrylic acid with ∼4 50 000 is marked as LPAA, and polyacrylic acid with ∼4 000 000 is marked as HPAA) and two-dimensional V2C-MXene. Their properties are characterized using a ball-on-disc tribometer, three-dimensional white-light interferometry topography images, optical microscope, Raman spectrometer, focused ion beam/scanning electron microscope and high-resolution transmission electron microscope/energy dispersive X-ray spectrometer (HRTEM/EDS). As a result, an ultralow friction (μ ≈ 0.073 ± 0.024) and an ultralow wear (3.41 × 10−7 mm3 N−1 m−1 for ball scar, and 7.49 × 10−8 mm3 N−1 m−1 for disc track) are achieved for the LPAA@V2C vs. steel ball system tested under 4 N in the air through tribo-physicochemical interactions. During the rubbing process, the LPAA@V2C nanocoating is transferred onto counter-bodies to form mixed-phase lubricative tribofilms. Monitoring via a HRTEM/EDS, the mixed-phase lubricative tribofilms are found to be mainly composed of amorphous carbon phases containing O and V and layered nano-debris along the sliding surface. The tribofilm's stable structure is the key to realizing ultralow friction and ultralow wear through the LPAA modification. These findings disclose that MXene-based nanomaterials can be applied for material engineering and mechanical engineering under common working conditions.
研究领域:
材料科学
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机械工程
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DOI
PubMed
高影响因子
Machines
·
2024
·Vol. 12
·期 11
·817
·
IF 2.1
Xinqi Zou,Zhenghao Ge,Chaobao Wang,Yuyang Xi
The low viscosity of water-lubricated films compromises their load-bearing capacity, posing challenges for practical application. Enhancing the lubrication stability of these films under load is critical for the successful use of seawater-lubricated bearings in engineering. Polydopamine (PDA) shows great potential to address this issue due to its strong bio-inspired adhesion and hydration lubrication properties. Thus, PDA nanoparticles and seawater suspensions were synthesized to promote adhesive lubricating film formation under dynamic friction. The lubrication properties of PDA suspensions were evaluated on Cu ball and ultra-high molecular weight polyethylene (UHMWPE) tribo-pairs, with a detailed comparison to seawater. The results show PDA nanoparticles provide excellent adhesion and lubrication, enhancing the formation of lubricating films during friction with seawater. Under identical conditions, PDA suspensions demonstrated the lowest friction coefficient and minimal wear. At 3 N, friction decreased by 56% and wear by 47% compared to distilled water. These findings suggest a novel strategy for using PDA as a lubricant in seawater for engineering applications.
研究领域:
材料科学
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海洋工程
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DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Yinglei Wu,Emile van der Heide,Sirui Wang
A borate ester (BMBS) and its sodium salts (BMBSNa) were synthesized and used as multifunctional lubricant additives in oleic acid. Results showed that BMBSNa possessed better anti-oxidation and tribological properties than BMBS. Worn surfaces analysis revealed that BMBSNa was more favorable to forming boundary film containing h-BN and FeS. Theoretical calculation suggested that BMBSNa had a higher chemical reactivity and better metal adsorption ability than BMBS. Fukui indices showed that sodium ions favor free radical reaction. Radial distribution functions (RDF) indicated that sodium ions help the adsorption of BMBSNa on the iron surface. It can be concluded that sodium ions benefit the oxidation resistance of base oil, and contribute to forming good boundary lubrication film to achieve good tribological properties.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
TRIBOLOGY LETTERS
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2016
·Vol. 64
·期 1
·1-9
·
IF 1.758
Chen Li,Zhang Xiaosheng,Xu Hong,Dong Jinxiang
The tribological properties of α-Zr(HPO 4 )·H 2 O and Cu(OH) 2 Zr(HPO 4 ) 2 ·2H 2 O (α-ZrP and Cu-α-ZrP, respectively) were investigated in lithium grease by using an optimol SRV-V oscillating reciprocating friction and wear tester (SRV). α-ZrP had excellent anti-wear and friction-reducing properties regardless of the applied load, frequency, and test duration. The applied load for α-ZrP reached 600 N, and the corresponding friction coefficient was 0.082. At 60 Hz, the wear volume rate was 11.16 × 10 −9 mm 3 /Nm. The tribological properties of Cu-α-ZrP were dependent on the test conditions, especially at higher frequency. The α-ZrP worn steel surfaces were smooth and shallow as indicated from scanning electron microscopy and a three-dimensional non-contact surface mapping profiler. Related elements were detected by energy-dispersive X-ray spectroscopy on the rubbed surfaces. A boundary solid film may form on the worn surfaces after friction tests. In reciprocating mode, α-ZrP stuck on the contacting surfaces, which enabled it to form a stable solid lubricant film more effectively than Cu-α-ZrP. The crystal structure may be important for film strength under high loads, especially at high speed.
研究领域:
材料科学
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摩擦学
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DOI
高影响因子
TRIBOLOGY LETTERS
·
2022
·Vol. 70
·期 4
·1-11
·
IF 3.327
Liu Sisi,Deng Yuxing,Sun He,Jiang Shengqiang,Liu Jingang
A modified carbon nanotube composite film was designed and prepared by self-assembled molecular film technology. The carbon nanotubes modified by 3-glycidoxypropyltrimethoxy-silane (KH560) were grafted onto a silicon substrate by using N-3-(trimethoxysilyl)propylethyl-enediamine (DA) molecules as an intermediate connecting layer. Compared with the silicon surface, the surface wettability of the modified carbon nanotube composite thin film changes from super-hydrophilic to hydrophobic. At the nanoscale, the surface adhesion and friction forces decreased by nearly 91% and 87%, respectively, and at the microscale, the friction coefficient was reduced by 84%. The anti-wear lifetime is prolonged to 72 min under an applied load of 1 N, which is over 35 times longer than that of silicon. Due to the great wear-resistant properties of modified carbon nanotubes, they are expected to be widely used in micro/nanoelectromechanical systems.
研究领域:
材料科学
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纳米技术
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表面工程
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DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2018
·
IF 3.246
Ziyan Lu,Zhenzhen Cao,Enzhu Hu,Kunhong Hu,Xianguo Hu
A method was developed to prepare WS 2 and WS 2 /TiO 2 nanoparticles . A blue tungsten oxide precursor was synthesized from Na 2 WO 4 , CH 3 CSNH 2 , and HCl. WS 2 nanoplatelets was produced after sulfurizing the precursor at 300 °C. Nano-TiO 2 could be activated by HCl and provide active sites for the deposition of the precursor to produce WS 2 /TiO 2 nanoparticles after sulfurization. The as-prepared two nano-additives slightly affected the friction reduction of diisooctyl sebacate (DOS), but they, especially WS 2 /TiO 2 , remarkably improved the wear resistance of DOS. Compared with the pure DOS, the 0.75% WS 2 /TiO 2 -containing DOS decreased the wear volume by ∼81%. The anti-wear performance of WS 2 /TiO 2 is ascribed to the formation of a lubricating film and the synergistic lubrication effect of WS 2 and TiO 2 .
研究领域:
材料科学
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摩擦学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Huimin Qi,Xuemei Lei,Jianzhen Gu,Yafeng Zhang,Xingshi Gu,Gai Zhao,Jiaxin Yu
Organogels with low modulus are widely used as anti-icing materials due to their low ice adhesion strength . In this work, the poly(dimethylsiloxane) swelled with silicone oil , trimethyl terminated poly(dimethylsiloxane), vinyl terminated polydimethylsiloxanes, and hydride terminated poly(dimethylsiloxane) were prepared, respectively. The organogels with a wide range of shear modulus displayed various ice adhesion strength. In particular, the lowest ice adhesion strength 6.5 kPa was obtained for poly(dimethylsiloxane)/100 trimethyl terminated poly(dimethylsiloxane) at −10 °C. After being placed for 60 days, the ice adhesion strength of poly(dimethylsiloxane)/trimethyl terminated poly(dimethylsiloxane) almost maintained the previous effect. We believed that the low modulus and the lubricated film co-contributed to this result. However, the even lower modulus of poly(dimethylsiloxane) gels enhanced the ice adhesion strength due to the failure within poly(dimethylsiloxane) gels. Molecular dynamics further demonstrated that the ice adhesion strength was almost independent on the electrostatic interactions and van der Waals. This work opens up new opportunities for tailoring modulus of organogels by tuning structures and composition of de-icing materials.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Keying Hua,Yongjia Shi,Miaomiao Tang,Xiangyu Zuo,Jun Gao,Xia Zhang
Water-based lubricants are essential in the field of tribology , and the application of nanoparticles as additives in water-based lubricants shows promise and significant practical importance. In this study, water-soluble Cu nanoparticles modified with methoxypolyethyleneglycol xanthate long-chain polymers were fabricated by a in-situ surface modification method. The tribological behavior of the Cu nanoparticles synthesized as additives in a water-PEG system was evaluated using a universal micro-tribotester. It was found that the synthesized nanoparticles could be stably dispersed in the water-PEG system and could enhance the tribological properties and load-carrying capacity of the system significantly. For example, the coefficient of friction could be reduced to 0.052, and the P B value increased to 588 N when the Cu nanoparticles were added at a mass fraction of 1.5 %. This was mainly attributed to the formation of a boundary lubrication film consisting of Cu, Fe 2 O 3 , Fe 2 (SO 4 ) 3 , and FeS throughout the entire friction process. The boundary film effectively prevents direct contact between the friction surfaces, thereby improving the tribological properties. The incorporation of Cu nanoparticles as additives into commercial cutting fluids resulted in a lower coefficient of friction and significantly enhanced the extreme pressure performance of the cutting fluids, demonstrating promising application prospects.
研究领域:
材料科学
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机械工程
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表面工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jianquan Zhao,Baogang Wang,Mina Luo,Hongsheng Lu
The biggest bottleneck restricting the application of two-dimensional (2D) g-C3N4 material in water lubrication is the large-scale acquisition of g-C3N4 nanosheets with satisfactory water dispersibility. In this work, a gel-like g-C3N4 nanosheet hybrid with g-C3N4 nanosheet cores and organic shells was constructed from the bulk g-C3N4 by three procedures of Hummer’s exfoliation, sulfonation, and acid–base neutralization. The hybrid in water exhibited nice water dispersibility and superior tribological performance. Adding 8 wt % of g-C3N4 nanosheet hybrid made the friction coefficient and wear volume of water reduce by 73.7 and 72.3%, respectively. Moreover, its load-carrying capacity under high load and durability under a long-term test were also impressive. The worn surface analyses reflected that a thick protective lubrication film (>150 nm) was distinctly formed on the surface lubricated by the hybrid aqueous dispersion. This film was actually a tribofilm composed of amorphous tribochemical reaction products (FexOy, FexSy, and Fex(SO4)y) embedded with FexOy and g-C3N4 nanocrystals, which not only remarkably reduced the friction and wear but also effectively restrained the oxidation and corrosion of the friction pair. Given the possibility of large-scale construction and the prominent tribological performance, the g-C3N4 nanosheet hybrid is a promising candidate to be developed as a particularly promising water-based additive.
研究领域:
材料科学
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摩擦学
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纳米技术
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2020
·
IF 4.271
Haijie Chen,Zhaowen Ba,Dan Qiao,Dapeng Feng,Zenghong Song,Jian Zhang
A series of graphene oxide composite lubricating films were fabricated in virtue of self-assembly technique driven by chemical bonds, which could strongly enhance interfacial interaction . The composite lubricating film Si-APS-GO-HOAF composed of GO and HFPO oligomer acid fluorides (HOAF) exhibited excellent tribological properties even immersed in 0.15 M NaCl solution for one month, attributing to strong interfacial interaction of chemical bonds and the synergistic effect of GO and HOAF . Furthermore, the outermost layer HOAF was partly adsorbed on the surface of the friction pair during the friction process and gradually formed a layer of transferred lubricating film. Surface analysis demonstrated that the formation of carbon oxide fragments and silicon oxides led to the damage of assembled layers, causing lubrication failure.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Haijie Chen,Zihao Zhang,Zhiwen Zheng,Jingjing Zhang,Dan Qiao,Chao Zhang
In response to the critical issues of delamination and cracking that plague CrN films within oil lubrication systems, this work designed and prepared multilayer alternating sputtering CrN/Cu 3 N films, and investigated the tribological properties under PAO10 lubrication, with particular emphasis on the influence of the composition, structure, coating arrangement and the mechanical properties of these films. The results showed that the composite film CrN/Cu 3 N (FH-Cu), which was alternately sputtered and capped with copper nitride, exhibited the optimal tribological properties, achieved a stable friction coefficient of 0.065 and the lowest wear rate (9.20 ×10 −8 mm 3 ·N −1 ·m −1 ). FIB-TEM analyses and Raman spectra indicated that a lubricating film containing graphene was in-situ generated at the friction interface. The DFT simulation results showed that the adsorption effect of copper nitride on the surface layer of the composite film FH (Cu) reduces the dissociation energy of PAO10 by 48 %. The results of differential charge density and Bader charge indicate that Cu 3 N (100) transfers 0.08e to PAO10 during friction, thereby demonstrating the frictional catalytic mechanism of Cu 3 N at the frictional interface. This work provides important insights into design of high-performance CrN/Cu 3 N composite films, highlighting the interactions among microstructure, catalytic activity, and friction-induced carbon films.
研究领域:
材料科学
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表面工程
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摩擦学
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纳米材料
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催化化学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Wanxing Xu,Tianyi Han,Chenhui Zhang
Water-lubricated bearings working at low velocity and high contact pressures face critical tribological challenges, especially the thinning and failure of the hydrodynamic water film leads to the direct contact of surface asperities, resulting in severe wear and friction noise. To solve these issues, this study designs an innovative hydrogel-microencapsulated polyether ether ketone (PEEK) composite through the combination of hydrogel microcapsules into the PEEK matrix. This water lubricated composite achieves a 64 % reduction in the coefficient of friction and a one-order-of-magnitude decrease in the wear rate, significantly enhancing the polymer's lubrication performance under severe operating conditions. The mechanism behind the lubrication enhanced performance is attributed to the in-situ formation of hydrogel lubricating films on the PEEK surface. This work proposes an innovative ‘rupture-grow’ lubricating strategy for developing polymer-based bearing materials to address critical tribological challenges.
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DOI
高影响因子
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