Tribological properties of naphthyl phenyl diphosphates as antiwear additive in polyalkylene glycol and polyurea grease for steel/steel contacts at elevated temperature

RSC Advances ◽  
2014 ◽  
Vol 4 (12) ◽  
pp. 6074 ◽  
Author(s):  
Xinhu Wu ◽  
Xiaobo Wang ◽  
Weimin Liu
Keyword(s):  
Elevated Temperature ◽  
Tribological Properties ◽  
Antiwear Additive ◽  
Polyalkylene Glycol ◽  
Polyurea Grease

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.

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.

Microstructure and tribological properties of TiZrV0.5Nb0.5Al refractory high entropy alloys at elevated temperature

Wear ◽  
2021 ◽  
pp. 204166
Author(s):  
Xuhui Pei ◽  
Yin Du ◽  
Xiaoxiao Hao ◽  
Hanming Wang ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Tribological Properties ◽  
High Entropy Alloys ◽  
High Entropy

Preparation and Tribological Behavior of Self-Lubrication Composites Ni-W-Cr-Fe-Cu-MoS2-Graphite at Elevated Temperature

2013 ◽  
Vol 668 ◽  
pp. 3-8 ◽  
Author(s):  
Jian Rong Sun ◽  
Chang Sheng Li ◽  
Hua Tang ◽  
Zhi Cheng Guo ◽  
Jin Ying Zi Liu
Keyword(s):  
Tensile Strength ◽  
Elevated Temperature ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Strengthening Effect ◽  
Wear Rates ◽  
Increasing Temperature

The composites of Ni-W-Cr-Fe-Cu-MoS2-Graphite with nano-MoS2 were prepared by powder metallurgy. Its tribological properties were investigated using the UTM-2 Nano+Micro Tribometer from room temperature to 600°C. The effects of amount of MoS2 and Ni-W-Cr prealloy powder, load, and temperature on the tribological properties were investigated and discussed. The results indicated that the addition of 43~45wt.% Ni-W-Cr prealloy powder had a strengthening effect on the hardness, anti-press and tensile strength. The tensile strength of the composite decreases with the addition of Nano-MoS2 and graphite, and the friction coefficient decrease with increase of the additives over the wide temperature range of 25°C∼600°C. The friction coefficients and wear rates of the composites reach the optimization value at 2.5wt.% MoS2,While its wear rates increase with the increasing temperature and load.

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