Sliding friction and wear behaviour of polytetrafluoroethylene and its composites under dry conditions

Ünal, Hüseyin; Mimaroğlu, A.; Kadıoglu, U.; Ekiz, Hüseyin

doi:10.1016/j.matdes.2003.10.009

Cited by 249 publications

(148 citation statements)

References 24 publications

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“…The same tendency occurred under water lubrication. As is also known from Unal [61], fatigue wear was the main wear mechanism under dry condition, and the tribological performance was improved evidently in water.…”

Section: Wear Ratesmentioning

confidence: 60%

“…The wear rates slowly descended with the velocity increase, which was attributed to the plastic flow acceleration caused by softening and melting on the composite surface proposed by Jia [62]. A reasonable interpretation could be that water reduced the friction surface temperature and further reduced the wear caused by the material softening due to heat, which was supported by Unal [61]. Similar to the PEEK tribopair, the wear rates of the PI tribopair exhibited a tendency to decrease with the decreasing loads or the increasing sliding velocities under dry friction.…”

Section: Wear Ratesmentioning

confidence: 73%

“…The adhesive wear at a low load occupied the main position. We may learn from Unal [61] that the deformation of the material caused damage when the load increased. The wear rate then increased.…”

Section: Wear Ratesmentioning

confidence: 99%

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Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

et al. 2017

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Polyether-ether-ketone (PEEK) and polyimide (PI) are two kinds of engineering polymer materials widely used as roller bearing cages and rings under extreme environment because of their noise reduction and corrosion resistance properties. The Si 3 N 4 ceramic is the most common ball bearing material. Many current engineering applications of ball bearings require aqueous lubrication. Therefore, this study presents the aqueous lubrication of tribopairs formed by PEEK and PI material sliding against Si 3 N 4 ceramic. Experimental results show that two tribopairs exhibited the similar tribological properties under the dry condition. Water as a lubricant for the PI-Si 3 N 4 tribopair pairs effectively reduces both friction coefficients by 35.5% and wear rates by 32%. The water absorption of PI induces better tribological properties by changing the tribopair surface properties. In addition, the dimples appearing on the PI tribopair surface under water generate additional hydrodynamic lubrication and further improve the friction properties of surface. The PEEK-Si 3 N 4 tribopair shows similar friction coefficients under two kinds of environments. The wear rates under water are approximately more than two times of that under dry sliding. However, water inhibits the appearance of the crush phenomenon and enhances the carrying capacity of the tribopair. Energy dispersive spectroscopy and X-ray diffraction spectra demonstrate no chemical corrosion. The 3D profiler and SEM morphologies illustrate that the transfer film would be formed from the surface of PEEK under water but hindered under dry friction. Overall, the PI-Si 3 N 4 tribopair exhibits better properties than PEEK under water and is promising for future applications in the bearing industry.

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Section: Wear Ratesmentioning

confidence: 60%

Section: Wear Ratesmentioning

confidence: 73%

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Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

et al. 2017

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“…The flowcell was CNC milled from PTFE (Teflon), chosen for its high temperature stability and more importantly its high chemical resistance [16]. The housing accepted two LEDs, a rubber gas seal, four locking screws, the coating slide and two M5 pneumatic gas fittings ( Figure 1) which acted as the gas inlet and outlet.…”

Section: Flowcell Fabricationmentioning

confidence: 99%

The optimisation of a paired emitter–detector diode optical pH sensing device

Orpen

Beirne

Fay

et al. 2011

Sensors and Actuators B: Chemical

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With recent improvements in wireless sensor network hardware there has been a concurrent push to develop sensors that are suitable in terms of price and performance.In this paper a low cost gas sensor is detailed, and significant improvements in sensor characteristics have been achieved compared to previously published results. A chemical sensor is presented based on the use of low cost LEDs as both the light source and photodetector, coupled with a sensor slide coated with a pH sensitive colorimetric dye to create a simple gas sensor. Similar setups have been successfully used to detect both acetic acid and ammonia. The goal of this work was to optimise the system performance by integration of the sensing technique into a purposely deigned flowcell platform that holds the colorimetric slide and optical detector in position. The reproducibility of the sensor has been improved through this arrangement and careful control of deposited film thickness. The enhanced reproducibility between sensors opens the potential of calibration-free measurement, in that calibration of one sensor can be used to model the characteristics of all sensors in a particular batch.

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“…Pure PTFE is characterized by high wear because of its small mechanical properties. Therefore, the reinforcement PTFE with glass fibres improves the load carrying capability that lowers the wear rate of the PTFE [24]. S. M.Yadav et.al (2012) used a pin-on-disk test apparatus to investigate the dry sliding wear characteristics of the pure PTFE (Poly tetra fluoro ethylene) and their composites.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Lubrication on Tribological Properties of Bearing Materials Using Pin on Disc: A Review

Kumar¹

2017

IJRASET

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A bearing is interposed between two surfaces in relative motion to minimize the friction. In generally used bearing materials like steels or its alloys depends on the continuous presence of a very thin -millionths of an inch-film of lubricant. Due to restricted lubricant flow or long run increase excessive temperature etc. These are the several reasons of failure of the bearing and this rate of failure of the bearing can be avoided by proper selection of bearing materials and lubricating system. The materials are processed to achieve desirable properties to maximize bearing performance and life. Wet condition lubricants are oils, which produce an oil film between two mating parts i.e. reduce wear and friction. Dry lubricants are materials which, despite being in a solid phase are able to reduce friction between two surfaces against each other without need a liquid oil medium. Over the years, the author has evaluated an P1n-on-d1sk tribometer will be described and discussed as will experimental methods for evaluating Wet conditions and Dry conditions. When evaluating what solid lubrication and hydrodynamic lubrication should be used for a specific application, the only sure way to determine how well it will perform.

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Sliding friction and wear behaviour of polytetrafluoroethylene and its composites under dry conditions

Cited by 249 publications

References 24 publications

Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

The optimisation of a paired emitter–detector diode optical pH sensing device

The Effect of Lubrication on Tribological Properties of Bearing Materials Using Pin on Disc: A Review

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