Polymers
·
2024
·Vol. 16
·期 19
·2828
·
IF 4.7
Qidi Hu,Kai Zeng,Sheng Han,Jian Xu,Wenjing Hu,Jiusheng Li
Anti-wear and anti-oxidation abilities are two key properties of lubricants that play a crucial role in ensuring long-term stable equipment operation. In this study, we aimed to develop a base oil with good anti-oxidation and anti-wear properties for use under extreme pressure. The as-prepared metallocene polyalphaolefin (mPAO) was chemically modified using the trifluoromethanesulfonic acid (TfOH) catalysis through an alkylating reaction with triphenyl phosphorothioate (TPPT). During the experiments, when the reaction temperature exceeded 70 °C or the concentration of TfOH exceeded 2.67%, theβ-scission reaction in the alkylation process became significantly more pronounced. The physical and chemical properties of TPPT-modified mPAO (T-mPAO) were evaluated by nuclear magnetic resonance spectroscopy, Fourier trans-form infrared spectroscopy, gel–permeation chromatography, and ASTM standards. T-mPAO showed significantly improved antioxidant capacity, with the initial oxidation temperature increasing by 32 °C compared to the base oil, and it exhibited the slowest increase in acid number in the 96-h oven oxidation test. The tribological tests showed that T-mPAO had the lowest friction coefficient, wear track, and wear rate (72.7% lower than that of mPAO) as well as the highest PB(238 kg) and PD(250 kg) among all tested samples. Compared to mPAO, the average friction coefficient of TPPT-modified mPAO in the four-ball friction test was reduced by 30.5%, and by 16.4% in the TE77 reciprocating friction test. Based on the experimental results, T-mPAO had strong anti-oxidation ability and excellent lubricating performance.The successful synthesis of multifunctional mPAO has enabled lubricant base oil additization, making it possible to use it in more demanding work scenarios, greatly broadening its application scope and making lubricant formulation blending more flexible.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 12
·1572
·
IF 2.9
Yuqin Zhu,Jia Liu,Liang Li,Weikang Sun,Wei Tang,Lei Wang
To improve lubricant performance and extend the service life of machinery, the friction reduction and anti-wear performance of nano-cerium oxide (nano-CeO2) and nitrogen-containing heterocyclic borate (BNH2) composite additives were studied in this work, with the goal of obtaining better lubrication effects than a single additive. The results showed that the nano-CeO2modified with Span80 had good dispersion stability in the base oil. The optimal addition mass fractions of single nano-CeO2and BNH2 were 0.6 wt% and 1.0 wt%, respectively. Compared with the base oil, 0.6 wt% nano-CeO2reduced the coefficient of friction by 44.9% and the wear spot diameter by 27.8%, while 1.0 wt% BNH2 reduced the coefficient of friction by 49.1% and the wear spot diameter by 32.8%. Compared with the single additions of nano-CeO2and BNH2, the compound nano-CeO2/BNH2 further improved the friction reduction and anti-wear performance of the lubricating oil. Compared with the base oil, the 0.8 wt% nano-CeO2/1.0 wt% BNH2 composite additive reduced the coefficient of friction by 55.9% and the diameter of the abrasive spot by 48%. Physicochemical analysis of the wear surface revealed that the combination of nano-CeO2and BNH2 had excellent synergistic effects. The generated lubricant films of nano-CeO2/BNH2 contained a chemical reactive layer of organic nitride (C–N), Fe2O3, FeO, and B2O3and a physical adsorbent layer of CeO2that provided great friction reduction and anti-wear effects during friction.
研究领域:
材料科学
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机械工程
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表面工程
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2024
·
IF 4.4
Niu WenXing,Zhao XinRui,Yuan Min,Hou ZhiGuo,Liu Lei,Xu Hong,Dong JinXiang
We studied different long-chain ammonium ions intercalated zirconium phosphate α-ZrP, methylamine intercalated ZrP (MA-ZrP), tetramethylammonium hydroxide intercalated ZrP (TMAH-ZrP), dodecyltrimethylammonium bromide intercalated ZrP (DTAB-ZrP), and stearyl trimethyl ammonium bromide intercalated ZrP (STAB-ZrP) as grease co-additives in combination with isobutylene sulfide (SIB). The grease with co-additives displayed excellent extreme-pressure and anti-wear performance. Moreover, the combination of the longest chain ammonium ion intercalated zirconium phosphate, STAB-ZrP/SIB, had the best tribological properties. In comparison to α-ZrP, the advantage of STAB-ZrP was that it did not form a large area of the dense physical film like α-ZrP on the worn surface, but rather gave the SIB a chance to contact with the fresh metal surface to generate a chemical film. Therefore, the sub-micron physical film and nanoscale chemical film always exist side by side on the contact surface during the friction process. This intercalated α-ZrP/SIB additive has great potential for use in harsh operating conditions.
研究领域:
材料科学
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摩擦学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Chenghong Hu,Jia Ai,Lin Ma,Ping Wen,Mingjin Fan,Feng Zhou,Weimin Liu
The work reports on the physicochemical and tribological properties of gallate ester oils prepared from fully renewable resources, such as gallic acid and fatty acids. The ester structures were identified by proton nuclear magnetic resonance spectroscopy (1H NMR), carbon nuclear magnetic resonance spectroscopy (13C NMR) and high-resolution mass spectra (HRMS) data. The density at 20 °C (d20), kinematic viscosity (KV), viscosity index (VI), pour point (PP), flash point (FP), thermal and oxidative stabilities, friction-reducing and antiwear properties of gallate ester oils were evaluated. The tribological properties of gallate ester oils as lubricants for steel, copper, and aluminum tribo-pairs can be compared with those of the commercially available lubricating oil tris(2-ethylhexyl) trimellitate (Phe–3Ci8), but their viscosity-temperature characteristics, thermal and oxidative stabilities are better than those of Phe–3Ci8. More importantly, they have much higher biodegradabilities than Phe–3Ci8. The study of the lubrication mechanism shows that the physical and/or chemical adsorption film formed by gallate ester molecules between friction pairs is the key factor for them to obtain friction-reducing and antiwear properties.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Ding Wang,Xiaohua Jia,Zhiqiang Shan,Li Gao,Jin Yang,Zhaofeng Wang,Haojie Song
Fluorinated graphene (FG) among numerous two-dimensional materials has enormous potential in improving antifriction properties. However, they being susceptible to thermal oxidation and prone to wear hinder practical applications. Herein, UIO-66-NH2 (Zr-MOF) enjoying good chemical and thermal stabilities was assembled on the surface of FG nanosheets under covalent bonds and van der Waals forces. The Zr-MOF@FG composite was successfully synthesized and used as a lubricant additive. It can be seen that Zr-MOF@FG composites offer a synergistic lubricant mechanism at the friction interface. Moreover, due to the adsorption and purification performance of Zr-MOF, the obtained Zr-MOF@FG composite adsorbs the abrasive rust during the friction process, thereby realizing the purification of the lubricant. These findings suggest that Zr-MOF@FG shows tremendous potential as a lubricant additive.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2024
·Vol. 76
·期 1
·70-80
·
IF 1.5
Zhicai Du,Qiang He,Hengcheng Wan,Lei Zhang,Zehua Xu,Yuan Xu,Guotao Li
PurposeThis paper aims to improve the tribological properties of lithium complex greases using nanoparticles to investigate the tribological behavior of single additives (nano-TiO2or nano-CeO2) and composite additives (nano-TiO2–CeO2) in lithium complex greases and to analyze the mechanism of their influence using a variety of characterization tools.Design/methodology/approachThe morphology and microstructure of the nanoparticles were characterized by scanning electron microscopy and an X-ray diffractometer. The tribological properties of different nanoparticles, as well as compounded nanoparticles as greases, were evaluated. Average friction coefficients and wear diameters were analyzed. Scanning electron microscopy and three-dimensional topography were used to analyze the surface topography of worn steel balls. The elements present on the worn steel balls’ surface were analyzed using energy-dispersive spectroscopy and X-ray photoelectron spectroscopy.FindingsThe results showed that the coefficient of friction (COF) of grease with all three nanoparticles added was low. The grease-containing composite nanoparticles exhibited a lower COF and superior anti-wear properties. The sample displayed its optimal tribological performance when the ratio of TiO2to CeO2was 6:4, resulting in a 30.5% reduction in the COF and a 29.2% decrease in wear spot diameter compared to the original grease. Additionally, the roughness of the worn spot surface and the maximum depth of the wear mark were significantly reduced.Originality/valueThe main innovation of this study is the first mixing of nano-TiO2and nano-CeO2with different sizes and properties as compound lithium grease additives to significantly enhance the anti-wear and friction reduction properties of this grease. The results of friction experiments with a single additive are used as a basis to explore the synergistic lubrication mechanism of the compounded nanoparticles. This innovative approach provides a new reference and direction for future research and development of grease additives.Peer reviewThe peer review history for this article is available at:https://publons.com/publon/10.1108/ILT-09-2023-0291/
研究领域:
材料科学
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机械工程
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Qisi Dai,Xinyi Zhou,Zhiwei Liu,Aoyun Cheng,Wenming Guo,Pengzhao Gao,Hanning Xiao,Hang Qin
In the process of dynamic filtration utilizing disc ceramic membranes, the rapid relative movement between the membrane layer and solid particles within the suspensions could lead to severe abrasion of the membrane. In this study, line patterns were fabricated on the surface of disc ceramic membranes to improve the abrasion resistance performance. As the primary raw material for preparing surface patterns, the zirconia toughened alumina (ZTA) samples sintered at 1475 °C with 2 wt.% addition of TiO 2 displayed a notable bending strength of 352.8 MPa, providing a guarantee for the superior abrasion resistance of the patterned membranes. The erosion wear tests were performed to predict the abrasion resistance of the membranes. Results indicated that when 8 surface lines were printed using a 1.2 mm nozzle, the patterned membranes subjected to the erosion wear test exhibited an abrasion rate of only 22.9% at the radius of 4 cm, which is less than 1/4 that of the non-patterned membrane. Using a 1.2 mm diameter nozzle to print 4, 8, and 12 lines on disc ceramic membranes resulted in enhanced abrasion resistance rates of 56.1%, 89.2%, and 92.9% for the patterned membranes, respectively, when compared to non-patterned membranes. Moreover, when filtering alumina suspensions with a solid content of 100 g/L for extended periods of time, the patterned membrane exhibited a stable permeate flux of 321 L/(m 2 ·h·bar) and a retention rate exceeding 99.6%, demonstrating consistently stable abrasion resistance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ping Wen,Qianqian Yan,Rui Dong,Yunyan Han,Ran Fang,Mingjin Fan
Severe competition between nanolubricant additives and polar lubricating oil molecules for the formation of lubricant films has been hindering the progress of green and advanced lubricants. In this work, based on the tautomerism of cyanuric acid molecule (trione and triol configurations), two kinds of triazine-based covalent–organic frameworks (COFs), that is, Ton-COFs and Tol-COFs, were synthesized as additives of the polar PEG 400 oil, realizing compromise between them by providing delicate interactions. The triazine matrix bonding with intense polar groups in the framework of additives offers more powerful interactions to competitively form the adsorbed lubricant film on the surface of the metal substrate over PEG 400 oil and also bolts PEG 400 oil molecules by the hydrogen bonding inside the pore of the framework to cooperatively bear against the load. Molecular quantum chemical calculations further confirm that Ton-COFs can produce a more intense interaction with Fe atoms in the form of coordination and ions···π than Tol-COFs, far beyond PEG 400, and the cross-sectional profile of the worn surface definitely exhibits a protective lubricant film only composed of Ton-COFs. Consequently, at the low concentration of 0.3 wt %, the excellent friction reduction (41.2%) and antiwear property (97.4%) are achieved for the Ton-COFs compared to pure PEG 400 oil; moreover, 28.6% and 79.0% for Tol-COFs at the essential concentration of 0.7 wt % are achieved. This finding provides a novel insight from molecules to materials into guiding the development of additives for advanced lubricants.
研究领域:
材料科学
·
润滑工程
·
量子化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bin Wang,Kai Gao,Yujie Wang,Qiuying Chang,He Yang
Magnesium silicate hydroxide (MSH), a self-healing agent at the nanoscale, is a potential novel additive material for lubricating oil. This study explores the impact mechanism of dispersibility and absorptivity on MSH’s anti-wear performance, using experimental research and molecular dynamics simulations. Results show that MSH alone, as an additive to poly-alpha-olefin lubricating oil, does not exhibit anti-wear effect. However, MSH modified by carboxylic acids, including oleic acid, elaidic acid, or stearic acid, reduces the wear by 44.1%, 31.5%, and 21.0%, respectively. This reduced wear is a result of improved dispersibility of MSH and enhanced adsorption on iron interface. Carboxylic acid connects to the hydroxyl groups of the Mg-O/OH tetrahedron through hydrogen bonds and exist in a form where the alkyl chains deviate from the solid interface. In comparison to elaidic acid and stearic acid, oleic acid can form a denser modified layer on the surface of both MSH and iron, resulting in superior dispersibility of MSH in lubricating oil and stronger adsorption on iron surfaces, ultimately leading to better anti-wear performance.
研究领域:
材料科学
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润滑工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2013
·
IF 1.536
Guangbin Yang,Jinfeng Zhang,Shengmao Zhang,Laigui Yu,Pingyu Zhang,Baoli Zhu
The tribological properties of two as-synthesized triazine derivatives were evaluated with a four-ball machine. Results show that the triazine derivatives show good antiwear and extreme pressure properties. Besides, the difference in the tribological properties of the triazine derivatives is closely related to the difference in their molecular structure. Namely, a synergistic tribological effect of the N-containing heterocyclic species and borate ester group in as-synthesized lubricant additive improves the antiwear performance of base stock. Moreover, a protective film containing B 2 O 3 , Fe 2 B, ammonium salt and so on is formed on worn surfaces to improve antiwear ability and load-carrying capacity of the lubricants.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Fan Xu,Haolin Li,Bingyu Tian,Kun Cui,Rui Dong,Mingjin Fan,Meirong Cai,Feng Zhou,Weimin Liu
Owing to the green, high-performance, and application-specific work conditions, water-based lubricating systems show unlimited potential for chemical engineering development. The interfacial behavior of functional additives in aqueous systems is complex and variable due to polarity and interfacial activity, thus showing important research significance. Herein, five novel ionic liquids were synthesized; their unique interfacial behavior in the polar water system contributes a lot to the advanced corrosion resistance and the improved extreme pressure-bearing capacity. The polar groups in the molecular structure of ionic liquids can adsorb preferentially in competition with water molecules, resulting in the formation of an adsorption layer with a high elastic modulus on the metal surface. Benefiting from the tribochemical reaction and the strong polar adsorption effect, the tribofilm at the sliding asperity exhibited effective antiscuffing and antiwear performance. Moreover, their characteristic cationic groups enrich the driving force of the molecular self-assembly process and enhance the ability to form ordered molecular aggregates, whose behavior in an aqueous system facilitates super-robust lubricity. This work can promote the in-depth understanding, future design, and optimization of the aqueous lubricating system, providing content enrichment and expansion for the lubrication technology for harsh service conditions.
研究领域:
材料科学
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化学工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2022
·
IF 4.695
Tiancheng Ouyang,Wentao Tang,Mingming Pan,Jing Tang,Haozhong Huang
Traditional lubricants fail to meet the trend of green development. Consequently, eco-friendly hybrid nano lubricants are synthesized by incorporating 0.5 wt% 3D hierarchical porous graphene (3D HPG) and 0.7 wt% multi-walled carbon nanotubes (MWCNT) nanoparticles to castor oil . The performances of nano lubricants are determined by linear reciprocating wear test, and the obtained wear marks on steel balls and plates are evaluated by depth-of-field microscopy, scanning electron microscopy, energy dispersive spectrometer and Raman spectroscopy . The results of steel balls and steel plates wear analyses are highly consistent. Characterization results for steel plates show that the 3D HPG: MWCNT (0.5:0.7) achieves a reduction in friction coefficient and wear volume up to 26% and 48% at low speed and heavy load conditions (4 Hz - 20 N, 2.7 GPa), respectively. The mechanism of friction-reducing and anti-wear at low speed and heavy load is that 3D HPG is torn into 2D graphene nanosheets due to its easy shear performance, which forms a 2D graphene nanosheets/MWCNT/2D graphene nanosheets sandwich structure to be further involved in lubrication . This rolled bearing-like synergistic effect can further reduce friction and wear. All in all, the environmentally friendly nano lubricants consisting of 3D HPG/MWCNT hybrid nanoparticles and castor oil have sufficient potential for application in the field of heavy machine parts.
研究领域:
材料科学
·
机械工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）