Water lubrication of PTFE composites

Deleanu, Lorena; Georgescu, Constantin

doi:10.1108/ilt-11-2011-0095

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…Graphene has aroused great interest among the scientists lately, due to their special physical properties which are supposed to be transferred to composite materials [1,2,3,6]. Some polymers show low mechanical properties which can be improved by adding various types of materials [7,11]. Using nanoparticles, an enhancement of mechanical, thermal and electrical properties can be obtained, even for small contents of additives [8,9,10,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Properties of Polyester Composite with Graphene and Graphite through Three-Point Bending Test

Bastiurea

Rodeanu

Dima

et al. 2014

AMM

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Graphenes have aroused great interest among the scientists lately, due to their special physical properties which are supposed to be transferred to composite materials [1,2,3,6]. Some polymers show low mechanical properties which can be improved by adding various types of materials [9,13]. Using nanoparticles, an enhancement of mechanical, thermal and electrical properties can be obtained, even for small contents of additives [10,11,12,14,15,16]. The evaluation of mechanical properties of polymer composites with graphene can be achieved relying on the three-point bending tests [4]. This work presents a few conclusions resulting from the three points bending tests of the polyester composites with graphene and graphite [7,8].

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Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Properties of Polyester Composite with Graphene and Graphite through Three-Point Bending Test

Bastiurea

Rodeanu

Dima

et al. 2014

AMM

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“…Water is used as a green lubricant to replace mineral oil and vegetable oil because of its low cost, flame retardancy, easy availability, and environmental friendliness [40]. Some friction and wear experiments of different composite materials under water lubrication have been conducted [41][42][43][44][45][46][47][48]. Tomizawa and Fisher [49] found that the friction coefficient between the Si 3 N 4 ceramics with water lubrication became less than 0.002 after a running-in process, making it the first study to see that water used as a lubricant could achieve superlubricity [50].…”

Section: Introductionmentioning

confidence: 99%

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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“…This indicated that the PTFE hydrothermal impregnation technology contributed to reducing the friction coefficient of the material and improved its anti-friction performance. [13] Furthermore, the friction coefficient of the samples slightly reduced with an increase of the sintering temperature of the copper-graphite composites, which may due to the high relative densities of the samples, which improved their overall anti-friction performances.…”

Section: Friction and Wear Propertymentioning

confidence: 97%

Performance of Copper‐Graphite‐Polytetrafluoroethylene Composites Fabricated by Spark Plasma Sintering and Hydrothermal Impregnation

Jiang¹,

Jiang²,

Zhang³

et al. 2020

ChemistrySelect

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Copper‐graphite composites prepared by spark plasma sintering (SPS) were used as raw material to synthesize copper‐graphite‐polytetrafluoroethylene (PTFE) composites via the hydrothermal impregnation of a PTFE emulsion. The microstructure, hydrophobic performance, friction property and interface behavior were systematically studied using scanning electron microscopy (SEM), a surface science comprehensive tester and a friction tester combined with various characterization methods, such as X‐ray diffraction (XRD), a laser particle size analyzer and metallographic microscopy. The results revealed that the copper‐coated graphite was consistent with the diffraction patterns of copper and graphite, and the coated‐copper had uniformly covered the graphite surface with good interface combination. The interface combination worsened with a decrease of the mass fraction of copper in the composites. Moreover, the water contact angle of the copper‐graphite‐PTFE composite of 50 wt. % Cu after PTFE impregnation reached 160°, and was hence superhydrophobic, while the copper‐graphite‐PTFE composite of 45 wt. % Cu exhibited the optimal performance with a friction coefficient, wear rate and resistivity of 0.112, 3.25×10−3 mm3/(N m), and 12×10−7 Ω m, respectively. PTFE impregnation improved the hydrophobicity and friction‐and‐wear properties of the copper‐graphite composites, and the resulting conductivity could meet the requirements of practical applications. Our results indicated that the content of copper played a crucial part in determining the comprehensive property of copper‐graphite‐PTFE composites.

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Water lubrication of PTFE composites

Cited by 12 publications

References 19 publications

Evaluation of Mechanical Properties of Polyester Composite with Graphene and Graphite through Three-Point Bending Test

Evaluation of Mechanical Properties of Polyester Composite with Graphene and Graphite through Three-Point Bending Test

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

Performance of Copper‐Graphite‐Polytetrafluoroethylene Composites Fabricated by Spark Plasma Sintering and Hydrothermal Impregnation

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