Optical and mechanical properties of DLC-Si coatings on polycarbonate

Damasceno, J. C.; Camargo, S.S.; Cremona, M.

doi:10.1016/s0040-6090(03)00313-4

Cited by 35 publications

(18 citation statements)

References 13 publications

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“…H doped DLC films have higher transparency and lower refractive index, that those of pure DLC films [8]. Si-doped DLC films increase the optical gap [9]. N doped DLC films have higher extinction coefficients than those of pure DLC films [10].…”

Section: Introductionmentioning

confidence: 97%

Photoluminescence enhancement induced by nanoparticles from La2O3 and CeO2 doped diamond-like carbon films

Zhang

Zhou

Guo

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 97%

Photoluminescence enhancement induced by nanoparticles from La2O3 and CeO2 doped diamond-like carbon films

Zhang

Zhou

Guo

et al. 2009

Journal of Alloys and Compounds

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“…Doping DLC with elements, such as Ti, W, Cr, Si and N, has been proposed as an alternative way to reduce the residual stress while maintaining fairly constant hardness values. Furthermore, this solution permits improved adhesion to different substrates and contributes to the inhibition of the graphitization of the films [1][2][3][4][5][6][7][8][9]. Finally, the incorporation of chemical elements in C-based coatings which can lead to carbide formation has been recently used for the deposition of nanocomposite coatings consisting of nanocrystals of the carbide phase immersed in a C-based amorphous matrix [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of magnetron co-sputtered W-doped C-based films

Silva¹,

Branco²,

Cavaleiro³

2006

Thin Solid Films

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In this paper, W-doped C-based coatings were deposited on steel and silicon substrates by RF magnetron sputtering, using W and C targets, varying the cathode power applied to the W target and the substrate bias. The chemical composition was varied by placing the substrates in a row facing the C and W targets. W content in the films increased from 1 to 2 at.% over the C target to ∼ 73 at.% over the W target. The coatings with W content lower than ∼12 at.% and ∼ 23 at.%, for biased and unbiased conditions, respectively, showed X-ray amorphous structures, although carbide nanocrystals must exist as shown by the detection of the WC 1−x phase in films with higher W content. C-rich films were very dense and developed a columnar morphology with increasing W content. An improvement in the hardness (from 10 GPa, up to 25 GPa) of the films was achieved either when negative substrate bias was used in the deposition, or when the WC 1−x phase was detected by X-ray diffraction. The adhesion of the coatings is very low with spontaneous spallation of those deposited with negative substrate bias higher than 45 V. Varieties in cathode power (90 W or 120 W) applied to the W target showed no observable influence on the characteristics of the films.

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“…Under these conditions, silicon-incorporated hydrogenated amorphous carbon films (DLC-Si) with hardness values around 20 GPa are obtained [7]. Additional details about the deposition and properties of these films can be found elsewhere [6][7][8][9]. Film thickness ranged from 2 to 3 Am in both cases.…”

Section: Methodsmentioning

confidence: 99%

“…Silicon-incorporated diamond-like carbon films (DLC-Si) and amorphous silicon carbide films (a-SiC) also have attracted considerable attention and present a great potential for applications as hard coatings since these films present very high hardness and reduced residual internal stress, high deposition rates and good adhesion to most substrates, including various metal alloys, steels and glasses [2][3][4][5][6][7][8][9]. One of the main advantages of DLC-Si coatings over pure DLC films is the fact that the friction coefficient of the former is independent on ambient humidity [10].…”

Section: Introductionmentioning

confidence: 99%

Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals

et al. 2005

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Amorphous silicon carbide (a-SiC) and silicon-incorporated diamond-like carbon films (DLC-Si) were evaluated as protective and friction reduction coatings onto Si 3 N 4 rings. Unlubricated tribological tests were performed with a pin-on-disk apparatus against stainless steel pins with loads ranging from 3 to 55 N and sliding velocities from 0.2 to 1.0 m/s under ambient air and 50-60% relative humidity. At the lowest loads, a-SiC coatings present a considerable improvement with respect to the behavior of uncoated disks since the friction coefficient is reduced to about 0.2 and the system is able to run stably for thousands of meters. At higher loads, however, a-SiC coatings fail. DLC-Si-coated rings, on the other hand, presented for loads up to 10 N a steady-state friction coefficient below 0.1 and very low wear rates. The lowest steady-state mean friction coefficient value of only 0.055 was obtained with a sliding velocity of 0.5 m/s. For higher loads in the range of 20 N, the friction coefficient drops to values around 0.1 but no steady state is reached. For the highest loads of over 50 N, a catastrophic behavior is observed. Typically, wear rates below 5Â10 À6 and 2Â10 À7 mm 3 /N m were obtained for the ceramic rings and pins, respectively, with a load of 10 N and a sliding velocity of 0.5 m/s. Analysis of the steel pin contact surface by scanning electron microscopy (SEM)-energy dispersive X-ray spectrometry (EDS) and Auger spectroscopy revealed the formation of an adherent tribo-layer mainly composed by Si, C and O. The unique structure of DLC-Si films is thought to be responsible for the formation of the tribo-layer. D

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Optical and mechanical properties of DLC-Si coatings on polycarbonate

Cited by 35 publications

References 13 publications

Photoluminescence enhancement induced by nanoparticles from La2O3 and CeO2 doped diamond-like carbon films

Photoluminescence enhancement induced by nanoparticles from La2O3 and CeO2 doped diamond-like carbon films

Characterization of magnetron co-sputtered W-doped C-based films

Silicon-incorporated diamond-like coatings for Si3N4 mechanical seals

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