On the significance of the H/E ratio in wear control: a nanocomposite coating approach to optimised tribological behaviour

Leyland, A.; Matthews, A.

doi:10.1016/s0043-1648(00)00488-9

Cited by 2,475 publications

(1,048 citation statements)

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“…2c and d. SiN (1/-/l) also showed the lowest wear rates and the highest H/E ratio. Leyland described the H/E ratio as a better way of predicting wear performance than hardness or elastic modulus individually (Leyland and Matthews, 2000). This approach predicts the poor wear performance for CoCr, but shows no trend for the remaining samples.…”

Section: Discussionmentioning

confidence: 99%

Mechanical and tribological behavior of silicon nitride and silicon carbon nitride coatings for total joint replacements

Pettersson

Tkachenko

Schmidt

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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Total joint replacements currently have relatively high success rates at 10–15 years; however, increasing ageing and an active population places higher demands on the longevity of the implants. A wear resistant configuration with wear particles that resorb in vivo can potentially increase the lifetime of an implant. In this study, silicon nitride (SixNy) and silicon carbon nitride (SixCyNz) coatings were produced for this purpose using reactive high power impulse magnetron sputtering (HiPIMS). The coatings are intended for hard bearing surfaces on implants. Hardness and elastic modulus of the coatings were evaluated by nanoindentation, cohesive, and adhesive properties were assessed by micro-scratching and the tribological performance was investigated in a ball-on-disc setup run in a serum solution. The majority of the SixNy coatings showed a hardness close to that of sintered silicon nitride (∼18 GPa), and an elastic modulus close to that of cobalt chromium (∼200 GPa). Furthermore, all except one of the SixNy coatings offered a wear resistance similar to that of bulk silicon nitride and significantly higher than that of cobalt chromium. In contrast, the SixCyNz coatings did not show as high level of wear resistance.

Funding Agencies|Swedish Foundation for Strategic Research (SSF)||VINNOVA||Swedish Institute||

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Section: Discussionmentioning

confidence: 99%

Mechanical and tribological behavior of silicon nitride and silicon carbon nitride coatings for total joint replacements

Pettersson

Tkachenko

Schmidt

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

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Funding Agencies|Swedish Foundation for Strategic Research (SSF)||VINNOVA||Swedish Institute||

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“…Nanotribological characterisation by nano-and micro-scratch testing with the modelling approach described provides direct access to the contact pressure so that peak stresses can be determined. The ratio of the hardness to modulus (H/E) has been found to correlate with tribological behaviour more closely than hardness alone with several reports of higher H/E being generally beneficial in sliding/abrasion [12][13][14]. In this work the relationship between the plasticity index (PI) and the ratio of hardness to reduced modulus (H/E r ) has been investigated for the different coatings.…”

Section: Introductionmentioning

confidence: 95%

“…Based on Johnson's contact mechanics analysis the critical load should scale with H 3 /E 2 on bulk materials [12,30]. For these coatings there was a strong but non-linear dependence on H 3 /E 2 and H/E (Tables 2 and 3).…”

Section: Nano-scratch Behaviour (R = 5 M)mentioning

confidence: 99%

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Beake

Liskiewicz

Vishnyakov

et al. 2015

Surface and Coatings Technology

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DLC coatings can combine high hardness with low friction. However, they are often deposited with high levels of intrinsic stress and display low adhesion strength resulting in poor performance in demanding applications. A highly topical challenge is to develop advanced DLC coatings capable of withstanding more demanding applications in the automotive, cutting tools, MEMS and oil and gas sectors. The results from several nanomechanical and tribological test techniques -nanoindentation, nano-scratch and nanofretting (nano-wear) -can be used together to aid the design of DLC coating architectures for enhanced durability in specific applications. In this study the behaviour of multilayered DLC coatings (Cr/W-C:H/a-C:H, Cr/W-C:H/Si-a-C:H) was compared to that of CrN/a-C:H:W (WC/C). We have previously reported that in nano-wear tests the coating with the highest hardness and H/E displayed greater wear resistance [T.W. Liskiewicz et al, Surf. Coat.Technol. 237 (2013) 212]. By employing nano-and micro-scale tribological testing with probes of differing sharpness it is possible to change the sensitivity of the test to probe the response of the coating top layer or the entire multilayer coating-substrate system. In the nano-scratch tests using a spherical indenter with a 5 m end radius the maximum stresses are located well within the top layer of the multilayer coatings and consequently the mechanical properties of this top layer dominate the nano-tribological behaviour. In the micro-scratch using a 25 m spherical probe the stress field extends further towards the sublayers and steel substrate and consequently the behaviour is completely different. Under these conditions the coating with the lowest hardness and H/E showed improved performance with higher critical loads for cracking and total coating failure. High resolution SEM imaging has been used to investigate this further. A simple contact model strongly suggests that cracking and failure events occur on the harder coatings when the maximum von Mises stress was located close to the interfaces in the multilayer systems.3

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“…Hardness (H), Young's modulus (E) and the H/E ratio were determined from these curves and the values are reported in Tables 4 and 5 for the as-deposited and annealed films, respectively. The H/E ratio is related to the surface wear resistance, being employed as an indirect indication of this property for thin films 34 .…”

Section: Film Composition and Morphologymentioning

confidence: 99%

Influence of the Tungsten Content on Surface Properties of Electroless Ni-W-P Coatings

Oliveira

Corrêa

Ett³

et al. 2017

Mat. Res.

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Ternary Ni-W-P films were produced by electroless deposition using baths with different tungsten concentrations. After deposition, the coated surfaces were annealed at 400°C for 1h. Surface morphology and film composition in the as-plated condition were assessed by SEM and EDS analyses, respectively. The crystalline phases after annealing were investigated by X-ray diffraction (XRD). Nanoindentation tests were performed to assess the mechanical properties of the deposited films. Surface roughness was determined by confocal laser scanning microscopy (CLSM). Friction coefficient was evaluated by reciprocating were tests in a nanotribometer. The corrosion behavior was evaluated by potentiodynamic polarization curves. The results showed that the surface morphology, crystallization behavior and corrosion resistance were affected by the tungsten content in the film. The best corrosion performance was obtained for the ternary films after annealing. Hardness, surface roughness and friction coefficient were dependent of the tungsten concentration in the film.

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On the significance of the H/E ratio in wear control: a nanocomposite coating approach to optimised tribological behaviour

Cited by 2,475 publications

References 50 publications

Mechanical and tribological behavior of silicon nitride and silicon carbon nitride coatings for total joint replacements

Mechanical and tribological behavior of silicon nitride and silicon carbon nitride coatings for total joint replacements

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Influence of the Tungsten Content on Surface Properties of Electroless Ni-W-P Coatings

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