Influence of temperature on friction of polymeric materials in water

Huang, Jian; Zhou, Xincong; Wang, Jun; Tang, Xinwang; Kuang, Fuming

doi:10.1016/j.wear.2019.01.115

Cited by 30 publications

(14 citation statements)

References 18 publications

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“…They have desirable properties such as better cooling ability, low toxicity, and fire resistance. Therefore, water-based lubricants are nowadays already used as an alternative to petroleum-based lubricants in applications such as hydraulic fluids (Tomala et al, 2010), cooling fluids for metal cutting (Khan et al, 2021), and bearings of the stern tubes in propeller shafts of ships (Huang et al, 2019). Moreover, water-based lubricants are used to mimic the body fluids to perform in vitro studies of the corrosion and tribocorrosion behaviour of bearing implant materials such as CoCrMo (Espallargas et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Additives in Water-Based Lubricants for Bearing Steel – Effect of Electrical Conductivity and pH on Surface Chemistry, Friction and Wear

2022

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Water-based lubricants have the potential to become the largest environmentally friendly lubricants in applications such as electric vehicles and the newly emerging green technologies of the future due to their inherent low viscosity and cooling properties. In order to be environmentally acceptable (EAL), both base lubricants and additives should comply with biodegradability, non-toxicity, and non-bioaccumulation requirements. Additives for water-based lubricants should ideally be polar and soluble in water and, at the same time, should not increase the electrical conductivity to critical levels for corrosion. However, most additives used in synthetic or mineral oils are non-polar. Ionic liquids have recently gained attention as lubricant additives due to their high polarity, making them highly surface-active (i.e. high tendency to adsorb on metal surfaces). However, they are seen as highly corrosive for many metal alloys. In this work, a water-glycol lubricant containing two different ionic liquids has been investigated as a potential green lubricant for a bearing steel AISI 52100 with accurate control on electrical conductivity and pH. The selected ionic liquids were tributylmethylphosphonium dimethylphosphate (PP) and 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate (BMP). The tribological behaviour of the ionic liquids was compared with a well-known organic friction modifier, dodecanoic acid (C12). The ionic liquids showed lower friction and wear rate than the water-based lubricant alone. However, they showed higher friction than the lubricant formulated with C12, in which PP gave lower friction than BMP due to low pH. A detailed subsurface analysis of the wear track using scanning-transmission electron microscopy (STEM) showed that a thick oxide tribofilm was built on the wear track for both lubricants formulated with ionic liquids due to high electrical conductivity. This tribofilm gave beneficial effect on wear. Although PP and BMP gave thicker tribofilms than C12, it was not durable, resulting in cracking and detachment.

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Section: Introductionmentioning

confidence: 99%

Ionic Liquid Additives in Water-Based Lubricants for Bearing Steel – Effect of Electrical Conductivity and pH on Surface Chemistry, Friction and Wear

2022

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“…Especially in the propulsion system of warships, the tail shaft is usually supported by water lubricated rubber bearings or high molecular polymer bearings (Litwin, 2015; Wu et al , 2019). However, due to the low viscosity of water and the poor wear resistance of nonmetallic bearing lining materials, WLBs have low load carrying capacity (LCC) and fail easily due to wear (Huang et al , 2019). Statistics show that the average specific pressure of WLBs is roughly 0.246 MPa and the service life is around 9,000 h, both of which are far less than that of oil lubricated bearings of the same size.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the influence of friction pair material hardness on the tribological behaviors of water lubricated thrust bearings

Liang

Yang

2021

ILT

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Purpose This paper aims to confirm that increasing the hardness of thrust collars can improve the load carrying capacity (LCC) and wear resistance of water lubricated thrust bearings (WTBs) made of polymers paired with non-polymeric thrust collars, and to design a WTB with high LCC and durability for a shaftless pump-jet propulsor of an autonomous underwater vehicle. Six kinds of WTBs were manufactured by matching aluminum bronze, stainless steel and silicon nitride with two different polymer bearing materials. Their tribological behaviors were tested and compared. Design/methodology/approach The tribological behaviors of the WTBs made with different materials were investigated experimentally on a specially designed test rig. Findings Aluminum bronze is not suitable for crafting thrust collars of heavy load WTBs due to severe abrasive wear. Two body abrasive wear first occurred between the thrust collar and the polymer bearing. Next, aluminum bronze wear particles were produced. The particles acted between the two materials and formed three body abrasive wear. Stainless steel/polymer bearings showed better wear resistance while Si3N4/polymer bearings were the best. Improving the hardness of thrust collars is significant to the LCC and service life of WTBs. Originality/value The wear mechanism of WTBs under heavy load conditions was revealed. Improving the hardness of the thrust collar was confirmed to be a preferable method to improve the wear resistance and LCC of WTBs. The results of this study may provide an important reference for the selection of water lubricated materials and the design of heavy load WTBs.

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“…Researches show that the minimum water film thickness of bearing will decrease with the increase of temperature, 3,6 so do the hardness and elastic module of bush materials. 7,8 However, the wear rate, friction coefficient, vibration and noise will increase along with the temperature. [9][10][11][12] Researches 13 indicated that the average friction coefficient of UHMWPE increases by 65.96% under 720 h, 80°C aging condition compared with the original sample.…”

Section: Introductionmentioning

confidence: 99%

“…17 Some researches considering temperature variation have conducted but the temperature range under study is diversify. 7,8,10,11 The working conditions have a significant effect on the bearing temperature characteristics. Studies show that the surrounding water temperature increment of WLSBs at 0.4 MPa can reach 50°C after an hour operation while it is less than 20°C at 0.2 Mpa.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to investigate temperature field evolution of water lubricated stern bearings (WLSBs) under hydrodynamic lubrication

Zhang

Yuan

Zu-sheng

2021

Advances in Mechanical Engineering

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Water lubricated stern bearings (WLSBs) are the critical component of ship propulsion system and have important effect on navigation safety. Operating temperature plays a main role on the performance of WLSBs. This paper aims to investigate the effect of operating conditions on bearing temperature characteristics under hydrodynamic lubrication. A novel CFD simulation method developed to improve calculation accuracy. Finite difference method was used to decrease the error of geometric modeling while the experiment and experimental correction formula were exploited to obtain improved boundary conditions. Based on the new method, the effects of operating conditions on temperature characteristics for two typical WLSBs were studied, and mechanisms of bearing temperature field evolution were discussed. Results show that the max friction coefficient appears when bearings are in low velocity and low load condition. Total heat flux density is a function of linear velocity, pressure and friction coefficient. Max temperature of bearing at 0.4 MPa decrease along with increased velocity, while decrease first and then increase at 0.2 MPa. Moreover, peak temperature appears at eccentric side and beyond minimum water film thickness position about 4–40°. High temperature area mainly located at the position of 80–140° in circumferential direction and 0.2–0.13 m in axial direction. With the increase of inlet water velocity, the max temperature of bearing changes slightly. It is appropriate to set the inlet velocity at 2 m/s to obtain better cooling performance. This work can provide theoretical basis for the operation monitoring of WLSBs and the development of new materials.

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Influence of temperature on friction of polymeric materials in water

Cited by 30 publications

References 18 publications

Ionic Liquid Additives in Water-Based Lubricants for Bearing Steel – Effect of Electrical Conductivity and pH on Surface Chemistry, Friction and Wear

Ionic Liquid Additives in Water-Based Lubricants for Bearing Steel – Effect of Electrical Conductivity and pH on Surface Chemistry, Friction and Wear

Experimental study on the influence of friction pair material hardness on the tribological behaviors of water lubricated thrust bearings

A novel approach to investigate temperature field evolution of water lubricated stern bearings (WLSBs) under hydrodynamic lubrication

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