Lubrication Science
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2022
·Vol. 35
·期 1
·1-13
·
IF 1.307
Chao Ju,Qin Zhao,Xiaobo Wang
A series of protic ionic liquids (PILs) containing dibutyldithiophosphate were simply synthesised and used as lubricant additive in base emulsion. The physico-chemical and lubricating properties of PILs in emulsion were systematically investigated. The stability of prepared emulsions containing PILs were similar with base emulsions by particle size distribution tests. Compared with traditional additive of polysulfide, the PILs in emulsion exhibited superior lubricating properties under harsh conditions. Surprisingly, the oil-miscible O-PILs in emulsion showed better friction and wear reduction than water-miscible T-PILs in emulsion. The stable protective films formed on the steel surface by results of scanning electron microscope and X-ray photoelectron spectroscopy were the main reason for the preferable performance.
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高影响因子
Lubrication Science
·
2022
·Vol. 34
·期 7
·441-448
·
IF 1.307
Hongxia Ma,Wei Wu,Zeyun Wang
In this work, TiO 2 nanoparticles modified with octadecylamine and dodecyl mercaptan (DDM/ODA@PDA@TiO 2 NPs) are uesd to improve the tribological properties of the white oil. The DDM/ODA@PDA@TiO 2 NPs which are simply prepared by mussel inspired chemistry and the Michael addition reaction can be facilely dispersed in the white base oil. Tribological measurements showed that the dispersion of the white oil containing 3 wt% DDM/ODA@PDA@TiO 2 NPs displays significant reductions in the friction coefficient and wear scar diameter at room temperature and 75°C. Further XPS investigation shows that the favourable tribological properties of DDM/ODA@PDA@TiO 2 NPs are ascribed to the synergistic effect of tribofilm (Fe 2 O 3 , Fe 3 O 4 , FeS 2 , FeS and FeSO 4 ) and TiO 2 nanofluids.
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高影响因子
Lubrication Science
·
2022
·Vol. 34
·期 4
·275-289
·
IF 1.307
Jiju Guan,Jian Wu,Chao Gao,Yong Wang,Xuefeng Xu
Sulfurised isobutylene (T321) was filled into the cavity of multi-walled carbon nanotubes (MWCNTs) in order to synthesise MWCNT/T321 composites. Tribological properties of water-based nanofluids with composites as additives were systematically investigated using a four-ball configuration. The results showed that MWCNTs were filled by T321 with a filling rate of 22.5%. The nanofluids prepared by the composites produced a significantly lower coefficient of friction and wear loss, in comparison with the lubricants containing only MWCNTs or T321. Such improvement was attributed to the fact that during sliding the T321 filled into composites was released onto the rubbing surface to generate a lubricating film, resulting in a low resistance to shear, whilst the MWCNTs served as nano-bearings on the formed lubricating film.
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高影响因子
Lubrication Science
·
2022
·Vol. 34
·期 5
·347-355
·
IF 1.307
Yongliang Jin,Jian Li,Weimin Lee,Bingxue Cheng,Dan Jia,Jiesong Tu,Shengpeng Zhan,Tian Yang,Haitao Duan
This study aims to investigate a novel high-efficient antioxidant for synthetic ester oils. An ester-bridged antioxidant, phloroglucinol tris (3-[3,5-di-tert-butyl-4-hydroxyphenyl]) propionate (PTP), was successfully synthesised in high yield under relatively mild reaction conditions. Thermal stability and oxidation resistance of diisooctyl adipate (DOA) ester oil were determined and compared to the typical commercial phenol antioxidants, including its tribological properties. The results indicate that the prepared PTP antioxidant exhibits considerably higher thermal stability than commercial antioxidants, and it also improves the oxidation resistance of the synthetic ester oil more effectively. Moreover, the addition of PTP antioxidant enhanced the wear protection of DOA ester oil without deteriorating its lubricating performance. The ester-bridged antioxidant can be used as a multifunctional additive, which not only exerts excellent thermal stability and oxidation resistance, but can also act as an efficient anti-wear agent in synthetic ester oils.
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高影响因子
Lubrication Science
·
2021
·Vol. 33
·期 7
·404-416
·
IF 1.985
Wei Wang,Shaowen Dong,Yuan Gao,Guoliang Zhang,Kuaishe Wang
In this investigation, a self-assembly method was used to fabricate black phosphorus (BP)/MoS 2 composites as water-based lubrication additives. The tribological behaviours of the lubrication additives for GCr15 steel ball/TC4 titanium alloy disk contact under different mass ratios, loads and rotational speeds were also investigated. The experimental results showed that 0.01 wt.% BP and 0.04 wt.% MoS 2 as water-based lubrication additive have the best the synergistic lubrication effect. Compared with pure water, coefficient of friction (COF) and wear rate of the lubrication additive at the test conditions of 8 N and 150 r/min were reduced by 32.6% and 68.8%, respectively. As the loads increased, the COFs and wear rates of all the lubricants including pure water, BP as water-based lubrication additive (BP-WL), MoS 2 as water-based lubrication additive (MS-WL) and BP/MoS 2 composites as water-based lubrication additive (BM-WL) were all reduced. As the rational speeds increased from 100 to 250 r/min, all the lubricants were firstly decreased and then increased. Based on tribological tests and wear surface analysis, the lubrication mechanism of BM-WL is proposed. The interlaminar shear and the adsorption of BP/MoS 2 composites on the wear surface of the friction pairs are the key to reducing COFs sand wear rates. In addition, the tribo-chemical reaction films consists of FeO/Fe 2 O 3 , Al 2 O 3 and TiO 2 were formed during the friction process, which can effectively protect the surface of the titanium alloy/steel contact from wear.
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高影响因子
Lubrication Science
·
2019
·Vol. 31
·期 4
·127-136
·
IF 1.682
Zeyun Wang,Jun Chang,Wei Wu
A detailed study on the synergistic effects of phosphate ionic liquids (ILs) and rust inhibitor (octadecylaminen-oleoyl sarcosinate (T711)) in the complex lithium grease (G) at room temperature and 100°C is presented in this paper. The results indicate that the hybrid additives (T711-ILs-G) showed better friction-reducing and antiwear properties than single additives (T711-G and ILs-G). In the case of T711-ILs-G, the presence of T711 can prevent rustiness of the worn surface so the ILs can easily react with the exposed substrate surface and form tribological films on the sliding surfaces.
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高影响因子
Lubrication Science
·
2016
·Vol. 28
·期 8
·505-519
·
IF 1.384
Fengjie Jin,Guangbin Yang,Yi Peng,Shengmao Zhang,Laigui Yu,Pingyu Zhang
N-containing borate ester (MEBE) with five-member ring structure as a lubricant additive was synthesised. The tribological properties in liquid paraffin (LP), poly-alpha-olefin (PAO) and dioctyl sebacate (DOS) were evaluated, and the action mechanisms in different base oils were also explored. It was found that as-synthesised borate ester possesses excellent antiwear performance in LP and PAO. XPS analysis suggests that the additive forms a protective film on the rubbing surfaces which is composed of BN, Fe 2 O 3 , polyoxyethylene ether and N-containing organic compounds. The inorganic and organic protective films in the metal surface effectively improve the antiwear ability of the base stock. However, when the additive MEBE was introducted into DOS base oil which is prone to adsorbing to the metal surface because of the high polarity of DOS, it influences the compactness of the film formed by the DOS, resulting in weak antiwear property. Copyright © 2016 John Wiley & Sons, Ltd.
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高影响因子
Lubrication Science
·
2025
·
IF 1.9
Tao Wu,Shuguang Fan,Ningning Song,Chuanping Gao,Shengmao Zhang,Yujuan Zhang
This study aims to explore the potential application of LaF 3 nanoparticles as high-performance gear oil additives. Lanthanum trifluoride nanoparticles modified by di(2-ethylhexyl) phosphoric acid (D2EHPA) [denoted as LaF 3 -D2EHPA], which exhibited excellent dispersion stability, were prepared using a liquid-phase chemical method. The tribological properties of LaF 3 -D2EHPA nanoparticles in weakly polar mineral base oil (150 N), polyalphaolefin (PAO6), and strongly polar synthetic ester oil diisooctyl sebacate (DIOS) were investigated using a four-ball friction and wear tester. In combination with the adsorption experiments using a dissipative quartz crystal microbalance (QCM-D), the compatibility and action mechanisms of LaF 3 -D2EHPA nanoparticles with extreme-pressure and anti-wear additives for typical gear oils were further investigated. The results indicate that when the mass fraction of LaF 3 -D2EHPA nanoparticles is 0.2%, the tribological properties of all three base oils are improved to the greatest extent. When LaF 3 -D2EHPA nanoparticles are mixed with gear oil additives T321 (sulfurized isobutylene) and T307 (ammonium thiophosphate), they exhibit high film-forming rates and anti-wear properties, forming a boundary lubricating film on the worn surface. This film consists of a tribochemical reaction film containing sulfur and phosphorus, as well as LaF 3 -D2EHPA nanoparticles that have been deposited.
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高影响因子
Lubrication Science
·
2025
·
IF 1.9
Xing'an Cao,Haixiang Huan,Linzhen Zhou
Among atmospheric contaminants, soot is known to cause severe wear of mechanical components and degrade lubricating oils; however, its impact on lubricity grease remains largely unexplored. This study investigates the interactions between carbon black (as a soot surrogate) and other lubricant additives, including molybdenum disulfide (MoS 2 ) and anti-wear additive zinc dialkyldithiophosphate (ZDDP). Additionally, the effects of individual and combined additions of MoS 2 and ZDDP on the tribological properties of soot-contaminated lithium grease (LG) were compared. The lubricity of LG decreased progressively with increasing soot concentration. Conversely, incorporating MoS 2 improved the lubricity of LG, with optimal performance observed at 0.5 wt%. The individual addition of MoS 2 to LG minimally mitigated the abrasive wear caused by soot; however, the inclusion of ZDDP T202 enhances the effectiveness of MoS 2 in reducing the friction and wear. MoS 2 and ZDDP participate in tribochemical reactions to form protective films during sliding. MoS 2 contributes by reducing friction, while ZDDP reacts to form protective films that enhance wear resistance. However, the combined addition of ZDDP and MoS 2 demonstrates limited effectiveness in fully mitigating the adverse effects of soot on grease lubrication. Consequently, exploring more efficient methods to prevent lubrication failure caused by soot.
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高影响因子
Lubrication Science
·
2024
·Vol. 36
·期 6
·468-477
·
IF 1.8
Han Yu,Min Li,Jianfang Sun,Jingying Su,Fenghua Su
As an emerging two-dimensional material, black phosphorus (BP) has excellent tribological properties, but the poor dispersion of BP in oil inhibits its application in friction to some extent. Surface modification is one of the effective methods to solve the dispersibility of BP, and the use of nano-Fe 3 O 4 dotted on the surface of BP improves the dispersion stability of BP in soybean from 3 days to about 15 days. Compared with pure soybean oil, friction coefficient and wear rate of the addition of 0.12 wt% BP/Fe 3 O 4 are reduced 65% and 78%, respectively. To elucidate the excellent tribological mechanisms of BP/Fe 3 O 4 as additives in soybean oil, the compositional and structural characterisation of the abrasion mark surface was studied accordingly. On the one hand, soybean oil reacts with BP/Fe 3 O 4 to form a composite tribo-film during the scraping process. This tribo-film composed of amorphous carbon, iron oxide and phosphorus oxide nitrides prevents direct contact between the sliding interfaces. On the other hand, BP and Fe 3 O 4 nanoparticles form a mechanical rollerball structure, which can further reduce interfacial friction and wear through synergistic lubrication. The results provide new insights into the design of additives in biomass lubricating oils and propose new application prospects for BP in the field of lubricating additives.
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高影响因子
Lubrication Science
·
2019
·Vol. 32
·期 1
·1-9
·
IF 1.682
Mingjin Fan,Shuai Zhang,Lin Ma,Yu Lu,Jia Ai,Xin Du,Wenjing Sun,Desuo Yang,Feng Zhou,Weiming Liu
In this work, a series choline monocarboxylate ionic liquids ([Ch][MA] ILs) were synthesized. The physicochemical properties and lubricating efficiency of the ILs on copper and aluminum discs were systematically investigated. At the same time, their ecotoxicity was explored on aquatic organisms. In comparison with 1-butyl-3-methyl imidazolium tetrafluoroborate (L-B104), which is a kind of traditional IL, [Ch][MA] ILs exhibited excellent lubricating properties and low toxicities, thus can be considered as environmentally friendly lubricants in tribology.
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高影响因子
Lubrication Science
·
2017
·Vol. 30
·期 1
·16-22
·
IF 1.414
Zeyun Wang,Wei Wu
Oil-miscible phosphonium-based ionic liquids have recently been attracted much attention. This study is to develop potentional high temperature lubricating greases based on oil-miscible phosphonium-based ionic liquids. This lubricating grease is prepared using oil-IL blend, which was obtained by adding 10wt% oil-miscible phosphonium-based ionic liquids into the PAO 40 base oil as base stock. Compared with the traditional PAO 40 polyurea grease, this polyurea grease has a little lower dropping point. Corrosion test results show the polyurea grease that was prepared using phosphonium-based ionic liquids cations connected with longer alkyl chains that are no corrosion to brass and steel. Most importantly, the polyurea greases demonstrate very promising tribological properties at 150°C, such as low friction coefficient, small wear volume, and high lubrication failure load. Surface characterization revealed the tribochemical film containing iron oxide, and Fe[PO 4 ] was formed on the worn surface.
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高影响因子
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