Friction and wear of PTFE — a review

Biswas, SK; Vijayan, Kalyanio

doi:10.1016/0043-1648(92)90039-b

Cited by 348 publications

(242 citation statements)

References 29 publications

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“…The presence of the abrasive acts to remove the oxide layer exposing the reactive metal while mechanical stresses fragment the PTFE molecular chain, allowing carbon-metal bonding to occur. The high bond strength of PTFE to the metal due to fragmentation of the PTFE molecular chain due to mechanical stresses and carbon-metal bonding formation has previously been identified [18]. Secondary bonding between the F -ions and the metal M ?…”

Section: Resultsmentioning

confidence: 99%

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Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Dunne

Roche

Twomey

et al. 2015

Shap. Mem. Superelasticity

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This work investigates the deposition of polytetrafluoroethylene (PTFE) onto a superelastic NiTi wire using an ambient temperature-coating technique known as CoBlast. The process utilises a stream of abrasive (Al 2 O 3 ) and a coating medium (PTFE) sprayed simultaneously at the surface of the substrate. Superelastic NiTi wire is used in guidewire applications, and PTFE coatings are commonly applied to reduce damage to vessel walls during insertion and removal, and to aid in accurate positioning by minimising the force required to advance, retract or rotate the wire. The CoBlast coated wires were compared to wire treated with PTFE only. The coated samples were examined using variety of techniques: X-ray diffraction (XRD), microscopy, surface roughness, wear testing and flexural tests. The CoBlast coated samples had an adherent coating with a significant resistance to wear compared to the samples coated with PTFE only. The XRD revealed that the process gave rise to a stress-induced martensite phase in the NiTi which may enhance mechanical properties. The study indicates that the CoBlast process can be used to deposit thin adherent coatings of PTFE onto the surface of superelastic NiTi.

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Section: Resultsmentioning

confidence: 99%

“…Strong adhesion of PTFE to metals has been reported previously, in spite of the chemical inertness of PTFE. This has been attributed to fragmentation of the PTFE molecular chain due to mechanical stresses and subsequent carbon-metal bonding [18].…”

Section: Introductionmentioning

confidence: 99%

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Dunne

Roche

Twomey

et al. 2015

Shap. Mem. Superelasticity

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“…The coefficient of friction is typically 0.1. However, the PTFE coating has low wear resistance and therefore cannot be used on metal-metal contact [14]. In reference [15], PTFE coating is used under low contact pressure.…”

Section: Other Methods To Reduce Frictionmentioning

confidence: 99%

Optimization of the flexural rigidity of a concentric pipe used in transmitting rotation for arc-shaped forceps

Noda¹,

Takayama²,

Omata³

2017

Robomech J

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Arc-shaped forceps are important in pharyngeal cancer surgery, endoscopic sinus surgery, and single port surgery. Rotating the gripper of an arc-shaped forceps with respect to its shaft axis can improve the manipulability of the forceps. Concentric pipe structures consisting of inner and outer pipes are often used for this purpose. The inner pipe transmits rotations from its proximal end to distal end. However, the shape of the bent inner pipe is generally different from that of the outer pipe, and this causes large friction between the outer and inner pipes. To reduce friction, a plastic tube is often used for the inner pipe. However, since its torsional rigidity is low, this results in a large twist angle. This paper proposes a procedure to fit a metal bent inner pipe to an outer pipe by adjusting the flexural rigidity of the inner pipe with slits to reduce the friction. The procedure minimizes the twist angle between the proximal and distal end of the arc-shaped forceps by reducing the torque required to rotate its metal inner pipe. We develop a 5 mm forceps with a 3.5 mm inner pipe. The twist angle is 2.8° when a load torque of 20 Nmm is applied, which is a typical load torque for suturing, whereas the twist angle of a PEEK (polyetheretherketone) inner pipe is 24.3° in simulation. Ex vivo experiments show that the required forceps torque is small in simulated clinical scenarios.

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“…It is found that the CoF decreased with increasing load [2][3][4][5], Kragelskii explained such a behavior by elastic deformation of the surface asperities [6]. However, the role of load, or more specifically contact pressure, on the formation of transfer films and tribolayers has not been systematically examined.…”

Section: Introductionmentioning

confidence: 99%

Effect of lubricants and sliding conditions on the tribo-performance of SiO₂/epoxy composites

Shen

Top

Rijn

et al. 2015

Surface and Contact Mechanics Including Tribology XII

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The influence of solid lubricants, normal load, sliding speed and water environment on the tribo-performance of solid lubricant-containing SiO 2 -epoxy composites is investigated. 10 to 15 wt% PTFE concentration yields a low coefficient of friction (CoF) and low wear rate under 60 N load. With increasing PTFE concentration in the composites, the load capacity decreases. Graphite exhibits worse friction and wear performance than PTFE under dry sliding condition, i.e. the CoF increases with a decreasing load in ball-on-disc. A higher concentration of PTFE-containing tribolayer on the worn composite surface is found under a higher load. The CoF and ball wear rate increase with increasing sliding speed under dry sliding, which is accompanied with an increase of the surface temperature of the composite. A high relative humidity is advantageous for a low friction due to adsorbed water molecules that lubricate the sliding couple. Water lubrication leads to a lower wear rate of the PTFE and graphite filled composites, whereas it gives rise to a higher wear rate of the Al2O3 ball due to the lack of protection of the transfer films.

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Friction and wear of PTFE — a review

Cited by 348 publications

References 29 publications

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Optimization of the flexural rigidity of a concentric pipe used in transmitting rotation for arc-shaped forceps

Effect of lubricants and sliding conditions on the tribo-performance of SiO₂/epoxy composites

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Friction and wear of PTFE — a review

Cited by 348 publications

References 29 publications

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Optimization of the flexural rigidity of a concentric pipe used in transmitting rotation for arc-shaped forceps

Effect of lubricants and sliding conditions on the tribo-performance of SiO2/epoxy composites

Contact Info

Product

Resources

About

Effect of lubricants and sliding conditions on the tribo-performance of SiO₂/epoxy composites