DLC-W coatings tested in combustion engine — Frictional and wear analysis

Mutafov, Petr; Lanigan, Joseph; Neville, Anne; Cavaleiro, A.; Polcar, Tomáš

doi:10.1016/j.surfcoat.2014.06.072

Cited by 36 publications

(19 citation statements)

References 15 publications

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“…One of the methods to reduce the stress are based on the use of different film compositions, for instance, with silicon addition [21] or multi layered architectures [22]. Recently, metal-containing hydrogenated diamond-like carbon coatings (Me-DLC) have attracted great interest since their initial appearance two decades ago [23][24][25]. The Me-C:H coating has high elasticity and a low friction coefficient, which can be useful for many engineering applications [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

2018

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Metal containing hydrogenated diamond-like carbon coatings (Me-DLC, Me = Al, Ti, or Nb) of 3 ± 0.2 μm thickness were deposited by a magnetron sputtering-RFPECVD hybrid process in an Ar/H2/C2H2 mixture. The composition and structure were investigated by Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The residual stress was measured using the curvature method and nanoindentation was used to determine the hardness and the Young’s modulus. A Ball-on-disk tribometer was employed to investigate the frictional properties and sliding wear resistance of films. The results show that the properties depend on the nature and the Me content in the coatings. The doping of the DLC coatings leads to a decrease in hardness, Young’s modulus, and residual stresses. Wear rate of the films first decreases with intermediate Me contents and then increases for higher Me contents. Significant improvements in the friction coefficient on steel as well as in the wear rate are observed for all Al-DLC coatings, and, concerning the friction coefficient, the lowest value is measured at 0.04 as compared to 0.07 for the undoped DLC.

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Section: Introductionmentioning

confidence: 99%

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

2018

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“…and/or nonmetal (N, Si, and etc.) doping in the α‐C thin films to improve their mechanical and tribological properties and meanwhile to maintain amorphous structure . For instance, as the strong carbide element, Ti can chemically bond with C and N atoms forming hard TiC and TiN nanocrystalline phase in the films, while the non‐carbide Cu do not chemically bond with C, but they arrange themselves in the form of nanoparticles within the carbon matrix .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Ti and N binary‐doped ɑ‐C films deposited by pulse cathode arc with ionic source assistant

Zhou

Wang

Liu

et al. 2018

Surface & Interface Analysis

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Using ionic source assistant, Ti and N co‐doped amorphous C (α‐C:N:Ti) thin films were prepared by pulse cathode arc technique. Microstructure, composition, elemental distribution, morphology, and mechanical properties of α‐C:N:Ti films were investigated in dependence of nitrogen source, pulse frequency, and target current by Raman spectroscopy, X‐ray diffraction, scanning electron microscopy, X‐ray photoelectron spectroscopy, atomic force microscopy, nanoindentation, and surface profilometer. The results show the presence of titanium carbide and nitride in a‐C:N:Ti films. The α‐C:N+:Ti film (6 Hz, 60 A) shows the smaller size and the higher disordering degree of Csp2 clusters. The α‐C:N+:Ti films present smoother surface and smaller particle size than for α‐C:N2:Ti films. N ions facilitate the formation of N‐sp3C bonds in the α‐C:N+:Ti films, and α‐C:N+:Ti (10 Hz, 80 A) film possesses the more graphite‐like N bonds. Higher hardness and lower residual stress present in the α‐C:N2:Ti (10 Hz, 80 A) film.

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“…The application of diamondlike carbon (DLC) coatings on machine elements deposited by means of physical vapor deposition (PVD) and plasma enhanced chemical vapor deposition (PECVD) is a common approach to meet the challenges of friction reduction, efficiency improvement and wear protection in various tribological systems [4][5][6][7][8][9][10][11]. This particularly includes piston rings, tappets, camshafts and plungers of injection systems and gearboxes [2,[9][10][11][12][13][14][15]. With regard to highly loaded rolling-sliding contacts as gears and rolling bearings, DLC coatings contribute to wear reduction due to their favorable effect on the load capacity in terms of pitting, scuffing and micro-pitting [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence of wetting and thermophysical properties of diamond-like carbon coatings on the frictional behavior in automobile gearboxes under elasto-hydrodynamic lubrication

Bobzin

Brögelmann

Stahl

et al. 2015

Surface and Coatings Technology

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DLC-W coatings tested in combustion engine — Frictional and wear analysis

Cited by 36 publications

References 15 publications

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

Structure, Mechanical and Tribological Properties of Me-Doped Diamond-Like Carbon (DLC) (Me = Al, Ti, or Nb) Hydrogenated Amorphous Carbon Coatings

Synthesis and characterization of Ti and N binary‐doped ɑ‐C films deposited by pulse cathode arc with ionic source assistant

Influence of wetting and thermophysical properties of diamond-like carbon coatings on the frictional behavior in automobile gearboxes under elasto-hydrodynamic lubrication

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