Effect of film thickness on the stress and adhesion of diamond-like carbon coatings

Sheeja, D.; Tay, Beng Kang; Leong, K. W.; Lee, C.H

doi:10.1016/s0925-9635(02)00109-7

Cited by 92 publications

(42 citation statements)

References 20 publications

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“…5) was observed, which could be due to the relatively softer evaporated carbon film transmitting more stress to the SWCNTN with increasing thickness (and thus increasing stress) of ta-C film. 40 From the above discussion, the theory formed indicates that the dominant reason for increase of resistance for the SWCNTN when coated by ta-C is due to the changes in junction resistance caused by the movement of SWCNT tubes/ bundles. Logically, etching some ta-C away should reduce the stress of the film, due to the reduction of thickness and some of the junctions (if not all) should relax, re-establishing old contacts and reducing the resistance.…”

Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 93%

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Iyer

Kaskela

Novikov

et al. 2016

Journal of Applied Physics

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Single walled carbon nanotube networks (SWCNTNs) were coated by tetrahedral amorphous carbon (ta-C) to improve the mechanical wear properties of the composite film. The ta-C deposition was performed by using pulsed filtered cathodic vacuum arc method resulting in the generation of Cþ ions in the energy range of 40-60 eV which coalesce to form a ta-C film. The primary disadvantage of this process is a significant increase in the electrical resistance of the SWCNTN post coating. The increase in the SWCNTN resistance is attributed primarily to the intrinsic stress of the ta-C coating which affects the inter-bundle junction resistance between the SWCNTN bundles. E-beam evaporated carbon was deposited on the SWCNTNs prior to the ta-C deposition in order to protect the SWCNTN from the intrinsic stress of the ta-C film. The causes of changes in electrical resistance and the effect of evaporated carbon thickness on the changes in electrical resistance and mechanical wear properties have been studied. Published by AIP Publishing.

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Section: B Evaporated Carbon Coated Samplesmentioning

confidence: 93%

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Iyer

Kaskela

Novikov

et al. 2016

Journal of Applied Physics

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“…For this purpose, two most important parameters that influence the adhesion in terms of debonding driving force are used for investigation. [32][33][34][35] These parameters are interface roughness of coating-substrate and coating thickness as shown in Figure 1. The investigation has been performed using a 'two set-up approach': (i) set-up 1: constant coating thickness with variable interface roughness and (ii) set-up 2: constant interface roughness with variable coating thickness.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of interface roughness and coating thickness to maximise coating–substrate adhesion – a failure prediction and reliability assessment modelling

Nazir

Khan

Stokes

2015

Journal of Adhesion Science and Technology

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A mathematical model for failure prediction and reliability assessment of coating-substrate system is developed based on a multidisciplinary approach. Two models for diffusion and bending of bi-layer cantilever beam have been designed separately based on the concepts of material science and solid mechanics respectively. Then, these two models are integrated to design an equation for debonding driving force under mesomechanics concepts. Mesomechanics seeks to apply the concepts of solid mechanics to microstructural constituent of materials such as coatings. This research takes the concepts of mesomechanics to the next level in order to predict the performance and assess the reliability of coatings based on the measure of debonding driving force. The effects of two parameters i.e. interface roughness and coating thickness on debonding driving force have been analysed using finite difference method. Critical/ threshold value of debonding driving force is calculated which defines the point of failure of coating-substrate system and can be used for failure prediction and reliability assessment by defining three conditions of performance i.e. safe, critical and fail. Results reveal that debonding driving force decreases with an increase in interface roughness and coating thickness. However, this is subject to condition that the material properties of coating such as diffusivity should not increase and Young's modulus should not decrease with an increase in the interface roughness and coating thickness. The model is based on the observations recorded from experimentation. These experiments are performed to understand the behaviour of debonding driving force with the variation in interface roughness and coating thickness.

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“…This contraction occurs during the film's deposition. Since a thick film has large compressive residual stress [27], corrosion of the base material, AZ31, seems to be responsible for making the film susceptible to breakage, resulting in a separation and a current density increase. Figure 5 shows the surfaces of the specimens Fig.…”

Section: Anodic Polarization Curvesmentioning

confidence: 99%

Electrochemical Polarization Characteristics of a DLC-Coated Magnesium Alloy Stent in a Saline Solution

Nakatani

Fukumoto

Wada³

et al. 2017

J. Photopol. Sci. Technol.

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One of the major problems encountered when using bioabsorbable magnesium alloy stents is their loss of strength over time, which is due to their high elution rates. Although the use of a diamond-like carbon (DLC) coating to overcome this drawback, the excellent biocompatibility of which has been confirmed, is drawing attention, research on its application to magnesium alloy stents is still scarce. The present research aims to verify the corrosion characteristics of DLC-coated magnesium alloys to establish a DLC coating technique that will allow controlling the decomposition rate of bioabsorbable magnesium alloys. DLC films were formed using a 13.56 MHz radio-frequency (RF) plasma chemical vapor deposition (CVD) apparatus, and the corrosion characteristics were verified using electrochemical measurements. The results of the experiments reveal that a DLC coating decreases the corrosion current density in comparison to an untreated magnesium alloy and that the inhibition of localized corrosion is possible. Application of this DLC coating is expected to provide a stent that is capable of preventing fractures caused by localized corrosion and to enable the control of the decomposition rate.

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Effect of film thickness on the stress and adhesion of diamond-like carbon coatings

Cited by 92 publications

References 20 publications

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

Optimisation of interface roughness and coating thickness to maximise coating–substrate adhesion – a failure prediction and reliability assessment modelling

Electrochemical Polarization Characteristics of a DLC-Coated Magnesium Alloy Stent in a Saline Solution

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