High temperature friction and wear properties of graphene oxide/polytetrafluoroethylene composite coatings deposited on stainless steel

Nemati, N.; Emamy, M.; Yau, Su Yee; Kim, J.-K.; Kim, D.-E.

doi:10.1039/c5ra23509j

Cited by 31 publications

(17 citation statements)

References 37 publications

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“…Owing to the severe mechanical stresses and thermal vibrations associated with frictional heating, the PTFEʹs molecular chain fractures into chain fragments by breaking −C−C− and/or−C−F− bonds. The active PTFE radicals (chain fragments) and the fluorine ions react and chemically bond with the metallic elements of the counterface, which results in strong adhesion and [166] Graphene [167] C15A Organoclay [49] Carbon nanotube [50] Carbon nanotube [129] Graphite [28] Copper [168] Epoxy [130] Graphene oxide [127] Gold [29] Polyparaben [128] Matrix UHMWPE PTFE a coherent transfer film. Further interaction between the bulk polymer and the transfer film gives rise to anisotropic deformation of the unit cell, resulting in the closeness of adjacent chains and easy shear between chains [126].…”

Section: Tribological Properties Of Polymer Composite Coatingsmentioning

confidence: 99%

“…Likewise, adding 15 wt% polyparaben (POB) to PTFE can reduce the wear rate of the coating by 75%. The bearing capacity of POB reduces the shear and peeling of the PTFE matrix, which further reduces the adhesive wear caused by the transfer of PTFE to the grinding pair [128]. Carbon nanotubes [129] can also reduce the wear rate of the PTFE coating by 60%.…”

Section: Tribological Properties Of Polymer Composite Coatingsmentioning

confidence: 99%

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A review on tribology of polymer composite coatings

et al. 2020

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Self-lubricating polymer composite coatings, with tailorable tribological and mechanical properties, have been widely employed on mechanical parts to reduce friction and wear, which saves energy and improves the overall performance for applications such as aerospace satellite parts, shafts, gears, and bushings. The addition of functional fillers can overcome the limitations of single-polymer coatings and extend the service life of the coatings by providing a combination of low friction, high wear resistance, high load bearing, high temperature resistance, and high adhesion. This paper compares the heat resistance, and the tribological and mechanical properties of common polymer matrices, as well as the categories of functional fillers that improve the coating performance. Applicable scopes, process parameters, advantages, and limitations of the preparation methods of polymer coatings are discussed in detail. The tribological properties of the composite coatings with different matrices and fillers are compared, and the lubrication mechanisms are analyzed. Fillers reduce friction by promoting the formation of transfer films or liquid shear films. Improvement of the mechanical properties of the composite coatings with fillers of different morphologies is described in terms of strengthening and toughening mechanisms, including a stress transfer mechanism, shear yielding, crack bridging, and interfacial debonding. The test and enhancement methods for the adhesion properties between the coating and substrate are discussed. The coating adhesion can be enhanced through mechanical treatment, chemical treatment, and energy treatment of the substrate. Finally, we propose the design strategies for high-performance polymer composite coating systems adapted to specific operating conditions, and the limitations of current polymer composite coating research are identified.

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Section: Tribological Properties Of Polymer Composite Coatingsmentioning

confidence: 99%

Section: Tribological Properties Of Polymer Composite Coatingsmentioning

confidence: 99%

A review on tribology of polymer composite coatings

et al. 2020

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“…However, owing to its poor wear resistance and mechanical strength, the practical engineering and application of PTFE composites still face many difficulties [3][4][5]. Various types of reinforcement materials including MnO 2 [6], MoS 2 [7], aramid fiber [8], and graphene oxide [9,10] have been added to the PTFE matrix to enhance the antifriction and wear resistance performance of this polymer. For instance, Aderikha et al studied the effects of expanded graphite with nanoscale lamellar structures on the friction and wear behaviors of PTFE composites under dry sliding conditions [11].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Thermal, mechanical, and tribological properties of sodium-montmorillonite-nanoparticle-reinforced polyethersulfone and polytetrafluoroethylene ternary composites

Yan

Xue

et al. 2020

Friction

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Polyethersulfone (PES) and polytetrafluoroethylene (PTFE) blend composites reinforced with sodiummontmorillonite (Na-MMT) nanoparticles were prepared by cold molding and vacuum sintering. The effects of the Na-MMT content on the thermal, nanomechanical, and tribological properties of the Na-MMT/PES/PTFE ternary composites were investigated in detail. The results indicate that at the optimal content, Na-MMT nanoparticles can be uniformly dispersed in the PES/PTFE binary blend composites and generate strong interfacial bonding with the polymeric matrix. Both the thermal stability and the nanomechanical properties of the PES/PTFE binary blend composites are clearly improved by the incorporation of Na-MMT nanoparticles. Among these PTFE-based composites, the Na-MMT/PES/PTFE ternary composite containing 10.0 wt% of Na-MMT nanoparticles exhibits the optimal friction and wear performance. Compared with those of the PES/PTFE blend composite, the friction coefficient (μ = 0.16) and wear rate (k = 2.63 × 10 −14 m 3 /(N•m)) of the 10.0 wt% Na-MMT/PES/PTFE ternary composite are 19.1% and 97.2% lower, respectively. The significant enhancement of the wear resistance of the Na-MMT/PES/PTFE ternary composite is attributable to the formation of PTFE self-lubricating transfer films. The transfer films generated on the worn surfaces of GCr15 steel balls can prevent direct contact between the PTFE composites and their metal counterparts, thereby protecting the polymer composites from damage.

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“…For this purpose, liquid lubricants or lubricating additives are often used at the interface. However, conventional lubricating technologies are restricted owing to the viscous effects on micro-systems and limitations in extreme operating conditions such as at high or low temperatures and pressures, in reactive environments, and under radiation [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Lubrication of dry sliding metallic contacts by chemically prepared functionalized graphitic nanoparticles

2019

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Understanding the mechanism of precision sliding contacts with thin, adherent solid nano lubricating particle films is important to improve friction and wear behavior and ensure mechanical devices have long service lifetimes. Herein, a facile and multistep approach for the preparation of graphene oxide (GO) is presented. Subsequently, surface modification of as-synthesized GO with octadecyl amine (ODA) is performed to prepare hydrophobic GO-ODA and with 6-amino-4-hydroxy-2-naphthalenesulfonic acid (ANS) to prepare amphoteric GO-ANS through a nucleophilic addition reaction. X-ray diffraction and ultraviolet-visible, Fourier transform infrared, and Raman spectroscopy provide significant information about the reduction of oxygen functionalities on GO and the introduction of new functionalities in GO-ODA and GO-ANS. The effects of particle functionalization for the improved control of particle adhesion to the tribocontact have been studied. Wettability and thermal stability were determined using the water contact angle, and atomic force microscopy and differential scanning calorimetry (DSC) were used to characterize particle adhesion to the tribocontact. The tribological performances of the particles have been investigated using macro-and micro-tribometry using pin/ball-on-disc contact geometries. The influence of particle functionalization on the contact pressure and sliding velocity was also studied under rotating and reciprocating tribo-contact in ambient conditions. With an increase in the contact pressure, the functionalized particles are pushed down into the contact, and they adhere to the substrate to form a continuous film that eventually reduces friction. Amphoteric GO-ANS provides the lowest and most steady coefficient of friction (COF) under all tested conditions along with low wear depth and minimal plastic deformation. This is because particles with superior wetting and thermal properties can have better adherence to and stability on the surface. GO-ANS has a superior ability to adhere on the track to form a thicker and more continuous film at the interface, which is investigated by field emission scanning electron microscopy, energy dispersive spectroscopy, and Raman analysis.

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High temperature friction and wear properties of graphene oxide/polytetrafluoroethylene composite coatings deposited on stainless steel

Abstract: Polytetrafluoroethylene (PTFE) coating is known as a low friction material that is often used as a solid lubricant coating.

Cited by 31 publications

References 37 publications

A review on tribology of polymer composite coatings

A review on tribology of polymer composite coatings

RETRACTED ARTICLE: Thermal, mechanical, and tribological properties of sodium-montmorillonite-nanoparticle-reinforced polyethersulfone and polytetrafluoroethylene ternary composites

Lubrication of dry sliding metallic contacts by chemically prepared functionalized graphitic nanoparticles

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