Tribological Properties of Alkylphenyl Diphosphates as High-Performance Antiwear Additive in Lithium Complex Grease and Polyurea Grease for Steel/Steel Contacts at Elevated Temperature

2014 ◽  
Vol 53 (14) ◽  
pp. 5660-5667 ◽  
Author(s):  
Xinhu Wu ◽  
Qin Zhao ◽  
Gaiqing Zhao ◽  
Junming Liu ◽  
Xiaobo Wang
Keyword(s):  
Elevated Temperature ◽  
Tribological Properties ◽  
High Performance ◽  
Antiwear Additive ◽  
Lithium Complex ◽  
Polyurea Grease ◽  
Lithium Complex Grease

Tribological properties of castor oil tris(diphenyl phosphate) as a high-performance antiwear additive in lubricating greases for steel/steel contacts at elevated temperature

RSC Advances ◽  
2014 ◽  
Vol 4 (97) ◽  
pp. 54760-54768 ◽  
Author(s):  
Xinhu Wu ◽  
Qin Zhao ◽  
Ming Zhang ◽  
Weimin Li ◽  
Gaiqing Zhao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Tribological Properties ◽  
Castor Oil ◽  
High Performance ◽  
Environmentally Friendly ◽  
Antiwear Additive ◽  
Diphenyl Phosphate

Castor oil tris(diphenyl phosphate) (CODP) was synthesized using an environmentally friendly resource – castor oil (CO), and its tribological properties were evaluated in lubricating greases at 150 °C.

Effect of preparation process on elevated temperature tribological properties of composite polyurea grease

2016 ◽  
Vol 68 (5) ◽  
pp. 611-616 ◽  
Author(s):  
Zujian Shen ◽  
Fei Geng ◽  
Xinxin Fan ◽  
Zhichen Shen ◽  
Haiyan Wang
Keyword(s):  
Thermal Stability ◽  
Elevated Temperature ◽  
Tribological Properties ◽  
Water Resistance ◽  
Physical Method ◽  
Heat Stability ◽  
Wear Properties ◽  
Excellent Thermal Stability ◽  
Content Type ◽  
Polyurea Grease

Purpose This paper aims to investigate and prepare the composite polyurea greases with excellent thermal stability and tribological properties. Design/methodology/approach In this paper, composite Ba-based (Ba, barium) tetra-polyurea lubricating greases were prepared with two different methods: mixing Ba-based gelatinizer and tetra-polyurea gelatinizer by a physical method; and introducing barium carboxylate into tetra-polyurea molecules by a chemical method. The properties of the products, such as heat stability, water resistance and friction performance, were analyzed with thermogravimetry, water-resistance test and four-ball friction test. Findings The results indicated that the products obtained by chemically introducing barium carboxylate into tetra-urea molecules showed better elevated temperature tribological properties, and the disadvantages of the polyurea greases with high temperature hardening were also obviously improved. The cone penetration rate at 180°C for 24 h is only 3 per cent. The friction coefficient can be decreased to 0.44 and the last non-seizure load value was increased from 560 N to 1,120 N without any other additives. Originality/value The research is significant because the prepared composite grease showed excellent performances, such as the outstanding thermal stability, water resistance and excellent extreme pressure and anti-wear properties, which may be widely applied in steel, metallurgy, bearings and other industrial fields.

Treelike polymeric phosphate esters grafted onto graphene oxide and its tribological properties in polyalkylene glycol for steel/steel contact at elevated temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 47824-47832 ◽  
Author(s):  
Xinhu Wu ◽  
Gaiqing Zhao ◽  
Xiaobo Wang ◽  
Weimin Liu ◽  
Weisheng Liu
Keyword(s):  
Graphene Oxide ◽  
Elevated Temperature ◽  
Tribological Properties ◽  
High Performance ◽  
Lubricant Additive ◽  
Phosphate Esters ◽  
Polyalkylene Glycol

We report the first synthesis of a high-performance lubricant additive by grafting treelike polymeric phosphate esters (PPEs) onto graphene oxide (GO) nanosheets.

scholarly journals Comparative study on corrosion resistance and lubrication function of lithium complex grease and polyurea grease

Friction ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 75-91
Author(s):  
Guanlin Ren ◽  
Pengfei Zhang ◽  
Xiangyuan Ye ◽  
Wen Li ◽  
Xiaoqiang Fan ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Salt Spray ◽  
Friction Reduction ◽  
Component Structure ◽  
Base Oil ◽  
Lithium Complex ◽  
Polyurea Thickener ◽  
Polyurea Grease ◽  
Lithium Complex Grease

AbstractIn this study, lithium complex grease (LCG) and polyurea grease (PUG) were synthesized using mineral oil (500SN) and polyalphaolefin (PAO40) as base oil, adsorbed onto lithium complex soap and polyurea as thickeners, respectively. The effects of grease formulation (thickener and base oil with different amounts (80, 85, and 90 wt%) on the corrosion resistance and lubrication function were investigated in detail. The results have verified that the as-prepared greases have good anti-corrosion ability, ascribed to good salt-spray resistance and sealing function. Furthermore, the increase in the amount of base oil reduces the friction of the contact interface to some extent, whereas the wear resistance of these greases is not consistent with the friction reduction, because the thickener has a significant influence on the tribological property of greases, especially load-carrying capacity. PUG displays better physicochemical performance and lubrication function than LCG under the same conditions, mainly depending on the component/structure of polyurea thickener. The polyurea grease with 90 wt% PAO displays the best wear resistance owing to the synergistic lubrication of grease-film and tribochemical film, composed of Fe2O3, FeO(OH), and nitrogen oxide.

Enhancement of tribological properties of greases for circuit breakers

MRS Advances ◽  
2018 ◽  
Vol 3 (64) ◽  
pp. 3979-3985
Author(s):  
Brenda Castaños ◽  
Cecilia Fernández ◽  
Laura Peña-Parás ◽  
Demófilo Maldonado-Cortés ◽  
Juan Rodríguez-Salinas
Keyword(s):  
Mass Loss ◽  
Tribological Properties ◽  
Wear Properties ◽  
Circuit Breakers ◽  
Wear Scar Diameter ◽  
Aluminum Complex ◽  
Electrical Industry ◽  
Security Test ◽  
3D Profilometer ◽  
Lithium Complex Grease

ABSTRACTGreases are essential in the electrical industry for the purpose of minimizing wear and coefficient of friction (COF) between the components of circuit breakers. Nowadays some researchers have explored the addition of nanoparticles to enhance their tribological properties. In this study, tribological tests were performed on different greases employed for the electrical industry. CuO and ZnO nanoparticles were homogeneously dispersed into the greases, varying their concentration (0.01 wt.%, 0.05 wt.%, and 0.10 wt.%). A four-ball tribotest, according to ASTM D-2266, and a ball-on-disk tribotest, according to ASTM G-99, were performed in order to analyze the wear scar diameter (WSD), COF, wear mass loss and worn area. The worn materials were characterized with an optical 3D profilometer measurement system. Anti-wear properties were enhanced up to 29.30% for the lithium complex grease (LG) with no nanoparticles added, in comparison with the aluminum complex grease (AG), providing a much better tribological performance; in the ball-on-disk tribotests, a 72.80% and a 15.74% reduction in the mass loss and COF were achieved, respectively. The addition of nanoparticles was found to provide improvements of 5.31% in WSD for the AG grease and 34.49% in COF for the LG grease. A pilot test was performed following the security test UL489, achieving a reduction of 45.17% in the worn area achieved by LG grease compared to AG grease.

Research on Mutual Synergy of Antiwear Additives in Lithium Complex Grease

2016 ◽  
Vol 59 (2) ◽  
pp. 330-339
Author(s):  
Wei Yu ◽  
Chunhua Zhang ◽  
Yuanhu Dong ◽  
Tom Reddyhoff
Keyword(s):  
Antiwear Additives ◽  
Lithium Complex ◽  
Lithium Complex Grease
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