Improving the friction and wear of poly-ether-etherketone (PEEK) by using thin nano-composite coatings

Mohammed, Abdul Samad; Fareed, Muhammad Irfan

doi:10.1016/j.wear.2016.07.012

Cited by 33 publications

(21 citation statements)

References 18 publications

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“…In order to further improve the PEEK properties, in particular wear resistance, frictional losses, mechanical properties and osteointegration, different strategies have been followed [2,3]. The most common method is based on reinforcing the polymer with different fillers, whose composition, size, concentration, orientation and shape are specific for the required property.…”

Section: Introductionmentioning

confidence: 99%

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Puértolas

Castro

Morris

et al. 2019

Carbon

177

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Poly(ether ether ketone) (PEEK) is a relevant thermoplastic in industry and in the biomedical sector. In this work, the lubricant capability of graphene nanoplatelets (GNPs) is used for improving the PEEK wear properties. Nanocomposites were prepared by solvent-free meltblending and injection molding at various compositions between 1 and 10 wt. % of GNPs. The Raman G band shows a progressive increment proportional to the bulk GNP percentage. From calorimetric data, the polymer matrix structure is interpreted in terms of a 3-phase model, in which the crystalline phase fluctuates from 39 to 34% upon GNP addition. Thermal conductivity varies in accordance with the polymer crystallinity. Tensile and flexural tests show a progressive increase in the modulus, as well as a decrease in the fracture strength and the work of fracture. Most important, the composite surface undergoes a substantial improvement in hardness (60%), together with a decrease in the coefficient of friction (-38%) and a great reduction in the wear factor (-83%). Abrasion and fatigue wear mechanisms are predominant at the lowest and highest GNP concentrations respectively. In conclusion, GNPs are used without any chemical functionalization as the filler in PEEK-based materials, improving the surface hardness and the tribological properties.

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Section: Introductionmentioning

confidence: 99%

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Puértolas

Castro

Morris

et al. 2019

Carbon

177

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“…PEEK is indeed biocompatible thanks to its high chemical inertia, and could be used in biochemical applications such as a substrate for an antibacterial metallic medium or implants with promoted cell adhesion . Either for prosthesis joints friction or wear resistance in mechanical applications, metal coating could also improve the tribological properties of lightweight polymer bearings or solid lubricants. Moreover, surface metallization is also needed to overcome the poor electric conductivity of polymers, especially for electronic applications …”

Section: Introductionmentioning

confidence: 99%

Role of adsorbed water on PEEK surfaces prior to − and after − atmospheric plasma activation

Gravis

Poncin-Epaillard

Coulon

2018

Plasma Processes & Polymers

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Poly‐ether‐ether‐ketone (PEEK) surfaces have been treated by atmospheric pressure plasma to increase their surface free energies − and hence, their adhesion potential towards metallic coatings as assessed by pull‐off test. Firstly, we show that adsorbed water on the polymer surface prior to plasma treatment acts as a shielding barrier against activation of the surface. This shielding effect is annealed by either a second plasma scan or by drying the surface before activation. Secondly, the relative humidity rate seems to be the main aging parameter on plasma‐treated surfaces. Our study reveals that high values of surface energies, and thus adhesion potential, can be assured and maintained for months by storing the material in a dry atmosphere before and after treatment.

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“…Samad et al [ 66 , 67 ] dip-coated UHMWPE and UHMWPE/CNTs nancomposite coatings on air-plasma treated polyether ether ketone (PEEK) substrates. Even though, PEEK is a high-performance polymer because of its higher temperature resistance, it shows a higher wear rate and coefficient of friction (~0.3), which makes it a poor candidate for tribological applications.…”

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

“…The improvement is attributed to the enhanced adhesion between the UHMWPE coating and the PEEK substrate because of the air-plasma pre-treatment, which helped in increasing the wettability of the surface (change in WCA: Untreated −93° to air plasma treated −32°) and to the excellent tribological properties of UHMWPE. However, it was reported that the UHMWPE coating could not sustain a higher load of 9 N. Hence, to further improve the load bearing capacity, air-plasma treated PEEK substrates were dip-coated with UHMWPE/CNTs nancomposite coatings with different concentrations (0.1 and 0.2 wt.%) of CNTs [ 67 ]. Two different concentrations (3 and 5 wt.%) of the UHMWPE polymer matrix were used to obtain different thicknesses of coatings.…”

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Samad

2021

Polymers

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In the recent past, polymer coatings have gained the attention of many researchers due to their low cost, their ability to be coated easily on different substrates, low friction and good anti-corrosion properties. Various polymers such as polytetrafluroethylene (PTFE), polyether ether ketone (PEEK), polymethylmethacrylate (PMMA), polyurethane (PU), polyamide (PA), epoxy and ultra-high molecular weight polytheylene (UHMWPE) have been used to develop these coatings to modify the surfaces of different components to protect them from wear and corrosion. However, among all these polymers, UHMWPE stands out as a tribologist’s polymer due to its low friction and high wear resistance. These coatings have found their way into applications ranging from microelectro mechanical systems (MEMS) to demanding tribological applications such as bearings and biomedical applications. Despite its excellent tribological properties, UHMWPE suffers from limitations such as low load bearing capacity and low thermal stability. To overcome these challenges researchers have developed various routes such as developing UHMWPE composite and hybrid composite coatings with several types of nano/micro fillers, developing composite films system and developing dual film systems. The present paper is an effort to summarize these various routes adopted by different researchers to improve the tribological performance of UHMWPE coatings.

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Improving the friction and wear of poly-ether-etherketone (PEEK) by using thin nano-composite coatings

Cited by 33 publications

References 18 publications

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Role of adsorbed water on PEEK surfaces prior to − and after − atmospheric plasma activation

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

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