Tribological behavior of uncoated and DLC-coated CoCr and Ti-alloys in contact with UHMWPE and PEEK counterbodies

Escudeiro, A.; Wimmer, Matthias; Polcar, Tomáš; Cavaleiro, A.

doi:10.1016/j.triboint.2015.02.002

Cited by 27 publications

(18 citation statements)

References 34 publications

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“…To add to this, the resulting coefficient of friction was 0.03. Escudeiro et al [36] studied the wear properties of Ultra-high-molecular-weight polyethylene (UHMWPE) and Polyether ether ketone (PEEK) when in contact with DLC and Zr-DLC coatings. During this investigation, each material was subjected to 2 million cycles (Mc).…”

Section: The Possible Causes Of Coating Delaminationmentioning

confidence: 99%

Investigation of the Integrity of aC:H Coatings on Stainless Steel Micro-Moulds during Thermal Cycling

Griffiths

Rees

Llewelyn

et al. 2018

J. Coat. Sci. Technol.

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Micro-injection moulding (µIM) is a key technology for scaling down larger geometry components and can include functional features at the micrometre scale and as far as the sub-micrometre length scale. Thermal cycling of amorphous hydrogenated carbon (aC:H) coated Stainless Steel (SS) has been investigated to simulate long-term micro-injection moulding (µIM) wearing and damage. Micro indentations and cracks were made into the mould and predictions of the crack behaviour were made using thermal expansion models. Validation of the results was performed with multiple heating and cooling cycles along with hardness measurements of the damage to the coating. The undamaged surfaces showed no major deformation but the cracks were shown to propagate and change in behaviour. The first two heat cycles of the testing had the most significant effect on the substrate with varying thermal expansions of materials being the main cause. The aC:H is shown to have excellent properties for mould tool applications but delamination could occur in areas susceptible to damaged and periodic surface inspection will be required preserve tool life.

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Section: The Possible Causes Of Coating Delaminationmentioning

confidence: 99%

Investigation of the Integrity of aC:H Coatings on Stainless Steel Micro-Moulds during Thermal Cycling

Griffiths

Rees

Llewelyn

et al. 2018

J. Coat. Sci. Technol.

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“…However being bio‐inert and hydrophobic limits its applications. Implementing diamond‐like carbon (DLC) coatings on PEEK is a promising strategy for bio‐applications owing to their good bio‐compatibility, such as their elastic modulus close to the cortical bone in human, excellent tribological, and mechanical properties . However, the adhesive strength at the interface of DLC coating and PEEK substrate poses a weakness in performing the function when high internal compressive stress and corrosive environment are present in human body.…”

Section: Introductionmentioning

confidence: 99%

“…However, the adhesive strength at the interface of DLC coating and PEEK substrate poses a weakness in performing the function when high internal compressive stress and corrosive environment are present in human body. Escudeiro et al and Dufils et al proposed incorporating with metallic compounds at the interlayers and altering the C to H ratio of the deposited thin film to improve the device performances.…”

Section: Introductionmentioning

confidence: 99%

“…Implementing diamond-like carbon (DLC) coatings on PEEK is a promising strategy for bio-applications owing to their good biocompatibility, such as their elastic modulus close to the cortical bone in human, excellent tribological, and mechanical properties. [42][43][44] However, the adhesive strength at the interface of DLC coating and PEEK substrate poses a weakness in performing the function when high internal compressive stress and corrosive environment are present in human body. Escudeiro et al and Dufils et al [42,43] proposed incorporating with metallic compounds at the interlayers and altering the C to H ratio of the deposited thin film to improve the device performances.…”

Section: Introductionmentioning

confidence: 99%

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The chemistry and topography of stabilized and functionalized graphene oxide coatings

Awaja

Wong

O’Brien

et al. 2018

Plasma Processes & Polymers

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Graphene oxide (GO) thin films and coatings are regarded as superior in quality to other materials especially for biomedical applications. However, the lack of stability and understanding of their structure and defects hinder their use in value added applications. Here, we describe our successful attempt at stabilizing, reducing and functionalizing GO through multiple plasma treatments with polymerizing (to deposit a crosslinking and compressing layer of diamond like carbon, DLC) and non‐polymerizing precursors (H2, O2, and N2). The hybrid GO and DLC coatings on semi crystalline PEEK were evaluated using AFM, SEM, and XPS. The GO deposited layer showed roughness around 70 nm and, despite care, resulted in several wrinkles and particle aggregations. The hybrid coatings conformed to the roughness and crystalline features of PEEK. XPS showed that the DLC layer cross‐linked the GO nano‐flakes while not completely masking which enable the partial exposure of GO. The GO‐DLC hybrid interface is higher in thickness than the PEEK‐GO and is dominating the overall thickness of the hybrid structure ≈13 ± 1 μm. XPS measurements showed that the often unstable CO functional groups on the surface of the hybrid coating can be reduced by effective plasma treatment. Plasma treatments also generated CO functional groups that probably originated from the decomposed carboxyl groups. The plasma treatment also contributed to the reduction of GO. Treatment with H2 was more effective in oxygen reduction than with the N2, however, treatment with N2 increased the reactants on GO as N2 is heavier tending to deposit more on a surface. Plasma treatment with O2 increased the surface oxygen content further and hence more defects on the hybrid surface.

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“…Against this background, Me‐DLC coatings were tribological investigated toward common used polymers in the latest study. Therefore, Escudeiro et al examined Zr‐doped DLC coatings in multidirectional pin‐on‐disk tests against Ultra‐high‐molecular‐weight polyethylene (UHMWPE) and polyaryletheretherketone (PEEK). The surface and tribological properties of N:DLC:Ni coatings for micro‐hot‐embossing processes were studied in a work by Saha et al .…”

Section: Introductionmentioning

confidence: 99%

The detachment behavior of polycarbonate on thin films above the glass transition temperature

Tillmann

Hagen

Hoffmann

et al. 2016

Polymer Engineering & Sci

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When producing mono-axially stretched films made of amorphous polycarbonate, a self-reinforcement is generated due to the stretching process. This leads to an increase of the strength and stiffness. The mono-axial stretching process is conducted at temperatures above the glass transition temperature, whereas better mechanical properties are obtained at higher stretching temperatures. However, the film tends to adhere to the rolls, especially at temperatures from 108C above the glass transition temperature. The rolls of the mono-axial stretching unit are made of an induction hardened and polished quenched and tempered steel 1.7225 -42CrMo4. This work reports on the investigation of the detachment behavior of polycarbonate on different coatings as a function of the temperature and contact time. The main intention is to find a suitable coating on which the polycarbonate film adheres only slightly at temperatures clearly exceeding the glass transition temperature. POLYM. ENG. SCI., 56:786-797, 2016.

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Tribological behavior of uncoated and DLC-coated CoCr and Ti-alloys in contact with UHMWPE and PEEK counterbodies

Cited by 27 publications

References 34 publications

Investigation of the Integrity of aC:H Coatings on Stainless Steel Micro-Moulds during Thermal Cycling

Investigation of the Integrity of aC:H Coatings on Stainless Steel Micro-Moulds during Thermal Cycling

The chemistry and topography of stabilized and functionalized graphene oxide coatings

The detachment behavior of polycarbonate on thin films above the glass transition temperature

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