Characterization and tribologic study in high vacuum of hydrogenated DLC films deposited using pulsed DC PECVD system for space applications

Lugo, D.C.; Silva, Patrícia C.; Ramírez, M. A.; Pillaca, Elver Juan de Dios Mitma; Rodrigues, C. L.; Fukumasu, Newton Kiyoshi; Corat, Evaldo José; Tabacniks, M.H.; Trava-Airoldi, V.J.

doi:10.1016/j.surfcoat.2017.07.084

Cited by 29 publications

(11 citation statements)

References 16 publications

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“…Furthermore, reduced take-off angle measurements provided information from greater depth, similarly to the measurements obtained from the bulk of the coating using Ar + sputtering The hardness values are summarized in Table 1. These properties were found to decrease as result of the silicon doping to 16.1 ± 1.0 GPa and 182.7 ± 7.0 GPa respectively, similar to other non-doped carbon films in the literature [45][46][47]. The addition of chromium reduced the hardness and reduced Young´s modulus compared to those values of the film solely doped with silicon, 13.5 ± 1 GPa and 160.0 ± 6.3 GPa, despite the increase in the sp 3 carbon content presented earlier.…”

Section: As-deposited Characterisationsupporting

confidence: 84%

Effect of chromium doping on high temperature tribological properties of silicon-doped diamond-like carbon films

Rodriguez

Schiller

Proprentner

et al. 2020

Tribology International

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Section: As-deposited Characterisationsupporting

confidence: 84%

Effect of chromium doping on high temperature tribological properties of silicon-doped diamond-like carbon films

Rodriguez

Schiller

Proprentner

et al. 2020

Tribology International

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“…At present, the most popular friction mechanisms proposed are hydrogen passivation and rehybridization (sp 3 -to-sp 2 transformation). ,− Hydrogen doping in the carbon-based films is recognized as an effective way to realize low friction from both experimental and theoretical aspects. ,,− DC.Lugo et al have concluded that friction coefficient of a-C:H films decreased with the increase in hydrogen content . They proposed two reasons that account for the low friction of a-C:H films: one is the hydrogen atoms saturating the dangling σ-bonds carbon at the interface, the other is the subsequent electrostatic repulsion between the two sliding surfaces .…”

Section: Introductionmentioning

confidence: 88%

“…Here, visible and ultraviolet(UV) Raman spectra were measured by adopting 532 and 325 nm argon ion laser as the excitation source, respectively. The former was used to determine the hydrogen content in the films following an empirical method. ,, The latter mainly detected the structural arrangement of carbon atoms, which qualitatively evaluated the fraction of sp 2 -hybridized carbon atoms in the a-C and a-C:H films.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Alternative Friction Mechanism for Amorphous Carbon Films Sliding against Alumina

Wang

Cheng

et al. 2019

Ind. Eng. Chem. Res.

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Amorphous carbon films with low friction and wear become a hotspot of research and engineering application for meeting the requirements of energy savings and environmental benefits. However, the comprehensive effect of intrinsic microstructure, sp 2 /sp 3 bonding ratio and hydrogen content, on the friction and wear of amorphous carbon film remains poorly understood. Here, basing on the experiments and first-principles calculations, the underlying mechanism between sp 2 carbon lubricating and hydrogen passivation toward low friction is proposed. For the films with high sp 2 carbon content, the friction coefficient increases with the hydrogen content, which demonstrates that the sp 2 carbon acts as a dominant lubricating agent for low friction in vacuum. On the other hand, the decreased friction coefficient with high hydrogen content increasing is mainly attributed to hydrogen passivation. The studies will allow for significant insight into the friction mechanism in tribological contacts and provide guidance on designing high-performance tribo-systems for engineering applications.

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“…Among them, the most common deposition technique of DLC films is plasma-enhanced CVD [5]. It is worth mentioning that the DC-pulsed plasmaenhanced CVD is a novel method because it is simpler and can be used on an industrial scale at a lower cost [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of DLC films on oxynitriding-treated Vanadis 10 tool steel through the various duty cycles of DC-pulsed plasma-enhanced CVD

Chang¹,

Wen²,

Huang³

et al. 2021

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In this study, DLC films were coated on oxynitriding-treated Vanadis 10 tool steel using the DC-pulsed plasma CVD technique. The experimental parameters included different duty cycles (9, 13, 17, and 21 %) with asymmetric bipolar-pulsed voltages of -3 kV, a gas flow of CH4 maintained at 15 sccm, and a deposition time of 90 min. Meanwhile, the properties of DLC films were measured by Raman spectroscopy, Rockwell indentation, wear tests, FT-IR, corrosion tests, water contact angle tests, and four-point probes analysis. The experimental results showed that the optimum properties of DLC films occurred at a duty cycle of 17 %. It had the lowest wear volume loss for loads 2 N and 5 N were 3.49 × 10 −3 mm 3 and 4.08 × 10 −3 mm 3 , respectively. Moreover, the optimal DLC films possessed the lowest corrosion current (Icorr = 7.91 × 10 −5 A cm −2 ) and highest polarization resistance (Rp = 1185.21 Ω cm 2 ) in 3.5 wt.% NaCl solutions. The FT-IR spectrum analysis also found that the characteristic peaks of DLC films were generated at positions of 2852 and 2921 cm −1 , and the water contact angle tests showed that the DLC films had great hydrophobicity (78.33 • ). Consequently, the results confirmed that the duplex surface treatment effectively improved the coating properties of Vanadis 10 tool steel. K e y w o r d s : diamond-like carbon (DLC), oxynitriding, Vanadis 10 tool steel, DC-pulsed plasma-enhanced CVD, wear, corrosion, water contact angle

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Characterization and tribologic study in high vacuum of hydrogenated DLC films deposited using pulsed DC PECVD system for space applications

Cited by 29 publications

References 16 publications

Effect of chromium doping on high temperature tribological properties of silicon-doped diamond-like carbon films

Effect of chromium doping on high temperature tribological properties of silicon-doped diamond-like carbon films

Alternative Friction Mechanism for Amorphous Carbon Films Sliding against Alumina

Optimization of DLC films on oxynitriding-treated Vanadis 10 tool steel through the various duty cycles of DC-pulsed plasma-enhanced CVD

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