Pressure-assisted synthesis of a polyaniline–graphite oxide (PANI–GO) hybrid and its friction reducing behavior in liquid paraffin (LP)

2018 ◽  
Vol 42 (2) ◽  
pp. 936-942 ◽  
Author(s):  
Lei Liu ◽  
Wei Zhou ◽  
Yongwei Chen ◽  
Songlong Jiao ◽  
Peng Huang
Keyword(s):  
Graphite Oxide ◽  
Liquid Paraffin ◽  
Optimum Concentration ◽  
Friction Property ◽  
Base Oil ◽  
Friction Reducing

PANI–GO hybrids were prepared via a pressure-assisted method, which can significantly enhance the anti-friction property of base oil at the optimum concentration of 0.012 wt%.

Preparation and tribological properties of a kind of lubricant containing cerium borate nanoparticles as additives

2019 ◽  
Vol 234 (11) ◽  
pp. 1789-1797 ◽  
Author(s):  
Lifeng Hao ◽  
Feng Cao ◽  
Zewen Jiang ◽  
Jiusheng Li ◽  
Tianhui Ren
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Lubricant Additive ◽  
Wear Property ◽  
Reaction Products ◽  
Tribochemical Reaction ◽  
Base Oil ◽  
Reducing Ability ◽  
Borate Ester ◽  
Friction Reducing

Oil-soluble compounds containing boron as lubricating additives were restricted by the hydrolysis of borate ester. In order to overcome this problem, cerium borate nanoparticles modified with oleic acid (O-CeB) as a potential substitute for conventional lubricant additive were studied in detail. The microstructures of the prepared nanoparticles were characterized. Tribological properties of cerium borate nanoparticles used as additive in base oil were evaluated, and the worn surface of the steel ball was investigated. The results show that O-CeB possesses better anti-wear ability at relatively higher concentration; in particular, it shows better friction-reducing ability under all these studied concentrations. Under higher load, its anti-wear property and friction-reducing property are better than that of Vanlube 289 in the base oil. Based on these results of interferometric surface profilometer and X-ray photoelectron spectroscopy, it can be deduced that a continuous resistance film containing depositions and the tribochemical reaction products was formed during the sliding process.

scholarly journals Nano Serpentine Powders as Lubricant Additive: Tribological Behaviors and Self-Repairing Performance on Worn Surface

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 922 ◽  
Author(s):  
Binbin Wang ◽  
Zhaodong Zhong ◽  
Han Qiu ◽  
Dexin Chen ◽  
Wei Li ◽  
...  
Keyword(s):  
Dynamic Balance ◽  
Liquid Paraffin ◽  
Lubricant Additive ◽  
Tribological Performance ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Steel Balls ◽  
Worn Surface ◽  
Friction And Wear Characteristics

Natural serpentine powders are applicable as additives for various lubricating oils. However, no uniform theories explain their tribological performance, lubrication, and wear mechanism, especially their self-repairing mechanism. Herein, the influence of different nano serpentine powders (NSPs) contents in liquid paraffin on the friction and wear characteristics of steel balls and the self-repairing process of NSPs on the worn surface were studied. Results show that the optimal amount of NSPs was 0.5 wt %. Relative to those of the base oil, the friction coefficients and wear spot diameters were reduced by 22.8% and 34.2%, respectively. Moreover, the long-term tribological test shows that the wear scar diameter decreased slightly after 3 h, reaching the state of dynamic balance between wear and repair. The outstanding tribological performance should be attributed to the formed bilayer tribofilm, the first layer of which contains nanoparticles surrounded by lubricants and the second layer of which contains nanoparticles compacted onto the surface of the steel ball.

Ultra-low wear and anti-oxidation properties of microcrystalline graphite oxide-magnesium silicate hydroxide composite nanoadditives in the poly-alpha-olefin base oil

2021 ◽  
pp. 1-23
Author(s):  
Wang Kai ◽  
Qiuying Chang ◽  
Rongqin Gao
Keyword(s):  
Graphite Oxide ◽  
Photoelectron Spectroscopy ◽  
Hydrothermal Process ◽  
Magnesium Silicate ◽  
Wear Scar ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
X Ray ◽  
Alpha Olefin

Abstract Graphite-based materials and hydrothermal synthetic magnesium silicate hydroxide (MSH) had shown outstanding performances as lubricant additives. In this paper, microcrystalline graphite oxide-magnesium silicate hydroxide (MGO-MSH) composite additives using pre-oxidized MGO as one of the precursors were prepared at a mild hydration condition, and their tribological properties in poly-alpha-olefin oil (PAO 10) were demonstrated by a four-ball tester. The tribological results showed that the optimal concentration of MGO-MSH in oil was 0.3 wt% under 600 N, 600 rpm. Meanwhile, the average wear scar diameter of the ball samples tested in composite-suspending oil was reduced by 36.3% compared with that obtained by pure PAO 10. By means of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectra, and X-ray photoelectron spectroscopy (XPS), it was verified that MGO was involved in the synthesis of MSH, and MSH was anchored on MGO during the hydrothermal process. In addition, it was confirmed that carbon-containing tribo-film was formed on the smooth wear region of the wear scar, and was of excellent anti-oxidation wear properties.

scholarly journals Tribological Behavior of Lamellar Molybdenum Trioxide as a Lubricant Additive

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2427 ◽  
Author(s):  
Wei Tang ◽  
Rui Liu ◽  
Xiangyong Lu ◽  
Shaogang Zhang ◽  
Songyong Liu
Keyword(s):  
Friction And Wear ◽  
Molybdenum Trioxide ◽  
Tribological Behavior ◽  
Normal Load ◽  
Lubricant Additive ◽  
Base Oil ◽  
Reducing Ability ◽  
Wear Reduction ◽  
Friction Reducing ◽  
Friction And Wear Tests

In this study, the tribological behavior of lamellar MoO3 as a lubricant additive was investigated under different concentrations, particle sizes, normal loads, velocity, and temperature. The friction and wear tests were performed using a tribometer and with a reciprocating motion. The results indicate that the friction-reducing ability and antiwear property of the base oil can be improved effectively with the addition of lamellar MoO3. The 0.5 wt % and 0.1 wt % concentrations of MoO3 yield the best antifriction and antiwear effects, respectively. The maximum friction and wear reduction is 19.8% and 55.9%, compared with that of the base oil. It is also found the MoO3 additive can decrease the friction considerably under a high velocity and normal load, and increase the working temperature. The smaller the size of MoO3, the better the friction-reducing effect the lamellar MoO3 shows. The friction-reducing and antiwear mechanisms of lamellar MoO3 were discussed.

Effect of Surface Modifier on their Tribological Properties of LaF3 Nanoparticles in Base Oil

2011 ◽  
Vol 230-232 ◽  
pp. 774-778 ◽  
Author(s):  
Guo Xian Yu ◽  
Mei Jin ◽  
Kun Wan ◽  
Ping Lu
Keyword(s):  
Surface Modification ◽  
Chain Length ◽  
Tribological Properties ◽  
Liquid Paraffin ◽  
Base Oil ◽  
Surface Modifier ◽  
Surface Modifiers ◽  
Base Oils ◽  
Chain Lengths ◽  
Effect Of Surface

Surface modifiers with different lipophilic chain lengths, such as, lauric acid diethanolamine, myristic acid diethanolamine, palmitic acid diethanolamine and stearic acid diethanolamine, were used to prepare four kinds of LaF3nanoparticles in the mixture solvent of water-ethanol. Morphology and surface modification of LaF3nanoparticles were investigated by TEM, FTIR and TG. Effect of length of surface modifier lipophilic chain on tribological properties of LaF3nanoparticles and their susceptibility to base oils were investigated by a four-ball machine. Results show that the tribological properties of LaF3nanoparticles in the base oil in build up as lipophilic chain length of surface modifiers increases; the longer the lipophilic chain is, the better the susceptibility of the nanoparticles to liquid paraffin wax is. This is mainly because that the lipophilic chain length influences the interface activity of the nanoparticles, moreover, for homologous organic acid soaps, the longer the lipophilic chain is, the better its friction reducing performance is; the properties of base oils also influence the interface activity of the nanoparticles.

scholarly journals Tribological properties of black phosphorus nanosheets as oil-based lubricant additives for titanium alloy-steel contacts

2020 ◽  
Vol 7 (9) ◽  
pp. 200530
Author(s):  
Qingjuan Wang ◽  
Tingli Hou ◽  
Wei Wang ◽  
Guoliang Zhang ◽  
Yuan Gao ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Alloy Steel ◽  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Liquid Paraffin ◽  
High Energy ◽  
Black Phosphorus ◽  
Lubricant Additives ◽  
Raw Material ◽  
Base Oil

The black phosphorus (BP) powders were prepared by high-energy ball milling with red phosphorus as the raw material, and then the BP nanosheets were obtained by liquid-phase exfoliation. The tribological properties of the BP nanosheets as oil-based lubricant additives were investigated by the ball-on-disc tribometer. Results show that compared with the base oil of liquid paraffin (LP), the coefficient of friction and wear rate of the BP nanosheets as the additives in liquid paraffin (BP-LP) are lower for the same loads. BP-LP lubricants could significantly improve the load-bearing capacity of the base oil for titanium alloy-steel contacts and show excellent friction-reducing and anti-wear properties. The surface morphologies and elemental compositions of the friction pairs were further analysed using an optional microscope, scanning electron microscope and X-ray photoelectron spectroscopy. The lubrication mechanism of BP-LP can be attributed to the synergistic effects between lamellar adsorption and interlayer shear of BP nanosheets.

Study on Tribological Properties of Antimony Nanoparticles as Liquid Paraffin Additive

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Jianlin Xu ◽  
Shuhua Yang ◽  
Lei Niu ◽  
Xiaoqi Liu ◽  
Jinqiang Zhao
Keyword(s):  
Tribological Properties ◽  
Friction Surface ◽  
Normal Load ◽  
Physical Adsorption ◽  
Liquid Paraffin ◽  
Test Machine ◽  
Wear And Friction ◽  
Friction Reducing ◽  
Worn Surface ◽  
Reducing Properties

Antimony nanoparticles, whose surfaces were modified by alkyl phenol polyoxyethylene ether (OP-10), were used as one of the types of lubricating additives in liquid paraffin (LP). The tribological properties of antimony nanoparticles as lubricating additives were evaluated and compared with those of pure LP on a four-ball test machine. The morphology and chemical composition of the worn surface were investigated and analyzed by using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the additives can obviously improve the anti-wear and friction reducing properties of LP, which are better under high friction load. The double-layer crystal structure of antimony can be separated and glided along the cleavage plane by a friction-shear force and a normal load, respectively. The separating and gliding of antimony can form a physical adsorption film, which can separate the friction surface to avoid direct contact of the friction surface and play an important role in improving the anti-wear and friction reducing properties.

Preparation and tribological properties of organically modified graphite oxide in liquid paraffin at ultra-low concentrations

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90525-90530 ◽  
Author(s):  
Lei Liu ◽  
Yongwei Chen ◽  
Peng Huang
Keyword(s):  
Tribological Properties ◽  
Graphite Oxide ◽  
Alkyl Chain ◽  
Liquid Paraffin ◽  
Friction Coefficients ◽  
Low Concentration ◽  
Low Concentrations ◽  
Organically Modified

Ultra-low concentration (0.008 wt%) of HDTMS or OTMS modified GO in liquid paraffin can reduce the friction coefficients (FC) of the mixtures by 34.0% and 15.5% respectively. HDTMS who possesses longer alkyl chain works better in decreasing FC.

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