TRIBOLOGY LETTERS
·
2023
·Vol. 71
·期 4
·1-11
·
IF 3.2
Tang Qiong,Zhao Zhiping,Li Ting,Ge Leizhen,Xu Hong,Liu Lei,Dong Jinxiang
A novel dual-functional group base oil was synthesized by alkylation of methyl oleate from biomass and tetralin from coal chemical industry. Interestingly, the monoalkylated product (MOAT) exhibited low pour point, high flash point, and viscosity index compared with the traditional alkyl aromatic lubricating oil (AN5), owing to the combination of the naphthenic aromatic (tetralin) and the methyl oleate framework. MOAT as co-base oil with PAO8 was studied to prepare lithium-based greases for the first time, and their rheological and tribological properties were evaluated in detail. The microstructure of the MOAT-based grease displayed high entanglement of lithium fiber. The 20% MOAT-based grease markedly reduced friction and wear compared with PAO8-based grease and 20% AN5-based grease. The excellent tribological performances were attributed to the strong interaction between the ester group and the soap fiber that provides more relative elasticity of grease and improves tribological behavior. Our finding clearly demonstrated that MOAT had the potential as a new class of base oil for obtaining high-performance lithium grease. Graphical Abstract
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
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.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2018
·Vol. 27
·期 4
·1927-1935
·
IF 1.34
Zhang Xiaosheng,Xu Hong,Dong Jinxiang
Nickel-ion-exchanged α -zirconium phosphate (Ni- α -ZrP) was synthesized by a mild hydrothermal synthesis method. Different raw material ratios (NaF/H 3 PO 4 /Ni(CH 3 COO) 2 ·4H 2 O) influence the particle size of the Ni- α -ZrP samples. The grain size could be controlled and distributed from 20 to 600 nm. Ni- α -ZrP was evaluated as an additive in lithium grease in a four-ball test. A 3.0 wt.% addition of Ni- α -ZrP to lithium grease yielded maximum non-seizure load values of 1235 N, and the wear scar diameter on the lower balls is 0.42 mm at 294 N. Compared with smaller particles, the addition of Ni- α -ZrP with a larger particle size to grease yields a better load-carrying capacity.
研究领域:
材料科学
·
化学工程
·
机械工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2023
·Vol. 75
·期 10
·1161-1169
·
IF 1.6
Huimin Yang,Chunlin Ye,Yi Li,Songwei Zhang
Purpose This study aims to probe the applicability of 2-mercaptobenzothiazole (MBT) functionalized ionic liquids (ILs) as additives in lithium complex grease (LCG) by researching the corrosion inhibiting, rheological and tribological performances. Design/methodology/approach Electrochemical tests such as electrochemical impedance spectroscopy and potentiodynamic polarization curves were used on Gamry electrochemical workstation to research the corrosion inhibition properties of ILs in 1.0 M HCl corrosive solution. The rheological properties of different grease samples were tested on a rheometer. The tribological properties were investigated on SRV-V oscillating reciprocating friction and wear tester. Scanning electron microscope, X-ray spectrometer and X-ray photoelectron spectrometer were used to characterize the lubricating mechanism. Findings The 2-MBT functionalized ILs have excellent corrosion inhibition properties. When used as additives in LCG, they both exhibited enhancing effects on thermostability, colloid stability and structural recoverability, and furthermore, outstanding friction-reducing and antiwear properties were also obtained. Surface analysis indicated that the superior lubricating performances of 2-MBT functionalized ILs were mainly ascribed to the formation of tribochemical products on wear tracks, including organic compounds with C–O bond, Fe 2 O 3 and FeS 2 . Originality/value The 2-MBT-based ILs synthesized in this study were multifunctional additives with excellent corrosion inhibiting and tribological properties, which would have a very broad application prospect in lubricating grease industry.
研究领域:
材料科学
·
化学工程
·
机械工程
·
表面工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2022
·Vol. 70
·期 1
·1-14
·
IF 3.327
Han Lukun,Niu Wenxing,Zhao Xinrui,Xu Hong,Dong Jinxiang
We describe herein the use of octadecyltrimethylammonium-templated aluminosilicate (designated as LS) as a thickener to induce gelation. LS samples with different aluminum/silicon molar ratios (Al/Si = 0, 0.05, 0.10, 0.15, 0.20) were synthesized hydrothermally and characterized by X-ray diffraction analysis, 27 Al MAS NMR spectra, elemental analysis, and scanning electron microscopy. The aluminum/silicon molar ratio was shown to be an important factor affecting the rheological properties of LS gels. With an increasing Al/Si molar ratio, the viscoelasticity and structural strength of the LS gel were enhanced, the dropping point increased, and the amount of oil separation decreased. LS (0.20) gel exhibited superior relative elastic properties. The strength of the LS (0.20) gel was also enhanced with increasing LS (0.20) content. In SRV tests, LS (0.20) gel with different content showed good performance in terms of load-bearing and anti-wear properties, indicating that LS was strongly adhered on the friction surface, and thereby promoted lubrication. A fair comparison was made between organic montmorillonite gel and LS gel under the same test conditions. Owing to simple preparation and the promising rheological and tribological properties, LS gels hold great potential for application in lubricating grease. Graphical Abstract
研究领域:
材料科学
·
化学工程
·
润滑技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）