The thermal stability of diamond-like carbon

Tallant, D. R.; Parmeter, J. E.; Siegal, Michael P.; Simpson, Regina L.

doi:10.1016/0925-9635(94)00243-6

Cited by 239 publications

(115 citation statements)

References 20 publications

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“…These annealed characteristics indicate that an annealed DLCH film would lose the hydrogen and induce graphitization reaction from C-C sp 3 bonded type transformation to C-C sp 2 bonded type and cause a small reduction of the residual stress. 26,27) Table 2 also implies that the DLCH is more stable and has slight graphitization when heating up to 300 C. This critical temperature is in agreement with the study that thermal annealing treatment would result in the conversion from amorphous carbon into graphite and soften the DLCH structure. [7][8][9] …”

Section: Contact Angle Testsupporting

confidence: 76%

“…However, such treatments will cause hardness significantly decreasing when annealed temperature is above certain critical transition point. [7][8][9] Other methods use the additive layer under the DLCH film, such as the interlayer structure (DLCH/Ti/substrate), multilayer structure (DLCH/TiCN/TiN/Ti/substrate) and special graded structure to improve the DLCH adhesion. 10) In addition, many studies have been reported about the property in DLCH over polymer structure.…”

Section: Introductionmentioning

confidence: 99%

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Spin-Coating Polyimide Film on Hydrogenated DLC Film Surface Prepared by Ion Beam Deposition Method

2006

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The present work describes the hybrid layers consisting of 1-mm-thick hydrogenated diamond-like carbon (DLCH) film deposited by ion beam deposition (IBD) method as the bottom layer and spin coating polyimide (PI) film at a thickness of 6 mm as the top layer. Optical microscopy shows that all DLCH film, PI film and PI/DLCH film have smooth surface and are free from cracks or wrinkles. Water contact angle measurement shows that the annealed DLCH film has the higher relative adhesive tension and adhesive work than that of PI film. Raman spectra show that the DLCH film can avoid severe graphitization & degradation at 300 C during annealing treatment, and FTIR spectra also exhibit that the PI film will reach 95% imidization during the curing step at 300 C. PI film can act on DLCH film as the stress buffer. This is demonstrate from warpage measurement showing that top PI film with tensile stress can partially reduce the compressive stress over bottom DLCH film with 6.7% warpage reduction. The electrical resistivity of PI/DLCH/Si is similar to that of PI/Si is resulted from the PI passivation effect.

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Section: Contact Angle Testsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Spin-Coating Polyimide Film on Hydrogenated DLC Film Surface Prepared by Ion Beam Deposition Method

2006

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“…The rationale comes out of the pressure induced temperature at the sliding contact; the hydrogen atoms are unbound from the diamond-like matrix and as a result, feebly hydrogen-depleted sites turn out. This weak surface is then deformed by the high contact stresses turning into a graphitic structure (from sp 3 bonded carbon to sp 2 bonded carbon) which favours a reduction of friction [42]. The carbon transition temperature for hydrogen desorption mostly depends on the initial hydrogen content and the sliding contact pressure.…”

Section: Phase Transition Analysismentioning

confidence: 99%

Tribological performance of an H-DLC coating prepared by PECVD

Solís

Zhao

Wang

et al. 2016

Applied Surface Science

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and 5.5 x 10 -8 mm -3 /N m, respectively. Through Raman spectroscopy and electron microscopy it was confirmed the carbon-carbon contact, due to the tribolayer formation on the wear scars of the coating and pin. In order to further corroborate the experimental observations regarding the graphitisation behaviour, the existing mathematical relationships to determine the graphitisation temperature of the coating/steel contact as well as the flash temperature were used.

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“…At high temperatures of 300-400 o C, hydrogen in the a-C:15H coating starts to diffuse out of the coating matrix, giving rise to collapse of the sp 3 to a sp 2 structure, often referred to as "graphitisation" [11], and the transformation process completes at a high temperature of 700 o C or more [12]. The graphitisation of DLC plays an important role in friction reduction under dry sliding conditions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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Abstract:Diamond-like carbon (DLC) coatings show extremely good promise for a number of applications in automotive components as they exhibit excellent tribological properties such as low friction and good wear resistance. This can impact on improved fuel economy and durability of the engine components. Much work has been reported on the dry sliding of DLC coatings with less so in lubricated contacts and, as such, there is a need to further understand the tribochemistry of lubricated DLC contacts. Commercially-available oils are normally optimized to work on ferrous surfaces. Previous studies on DLC lubricated contacts have tended to use model oil systems rather than fully formulated lubricants and from this an interesting picture of lubrication mechanisms is emerging. Optimising compatibility between a surface and a set of lubricant additives may lead to excellent durability (wear) as well as increased fuel economy (low friction). In this work, the friction and wear properties of a DLC coating under boundary lubrication conditions have been investigated and the tribological performance compared with that of an uncoated steel system. A pin-on-plate tribotester was used to run the experiments using High speed steel (HSS) M2 grade plates coated with 15 at.% hydrogenated DLC (a-C:15H) sliding against cast iron pins. A Group III mineral base oil, fully synthetic Group IV PAO and four different fully formulated oils were used in this study. Furthermore optical and scanning electron microscopes (SEM) were used to observe the wear scar and to assess the durability of the coatings. Energy-Dispersive X-ray analysis (EDX), X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy analyses were performed on the tribofilms to understand the tribochemical interactions between oil additives and the a-C:15H coating.This study show that the durability of the a-C:15H coating strongly depends on the selected additive package in the oils. In addition the effect of detergent, dispersant and antioxidants on the performance of the Molybdenum-based friction modifier (Mo-FM) and ZDDP anti-wear additive were investigated and results are reported in this paper.

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The thermal stability of diamond-like carbon

Cited by 239 publications

References 20 publications

Spin-Coating Polyimide Film on Hydrogenated DLC Film Surface Prepared by Ion Beam Deposition Method

Spin-Coating Polyimide Film on Hydrogenated DLC Film Surface Prepared by Ion Beam Deposition Method

Tribological performance of an H-DLC coating prepared by PECVD

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

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