Tribological characteristics of Si-containing diamond-like carbon films under oil-lubrication

Ban, Masashi; Ryoji, Makoto; Fujii, Sadao; Fujioka, Junzo

doi:10.1016/s0043-1648(02)00156-4

Cited by 61 publications

(24 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Si,O doped DLC does not show the reduced friction that may have been expected when compared to the a-C:H, as seen in dry sliding experiments (3,4). This however is in-line with literature precedents concerning Si-DLCs in lubricated contacts where SiDLCs friction reducing properties are markedly reduced (8,9). Thus, it can be concluded that in boundary lubricated contacts the inherent ability of Si-DLCs to self-lubricate is compromised.…”

Section: Frictionsupporting

confidence: 81%

“…Lubricated test results are not as favourable (1,2,(8)(9)(10). In the vast majority of cases (Table 1), Si-DLC is reported to increase the overall wear of the coating when compared to a similar non-doped (a-C:H) DLCs.…”

Section: /Spmentioning

confidence: 99%

“…Typically, when lubricated with a fully formulated lubricant Si and Si,O doped DLCs exhibit coefficients of friction within the range of 0.06 -0.12 (9)(10)(11). In water, Si DLC shows similar coefficients of friction, within the range of 0.06-0.09 (14).…”

Section: Frictionmentioning

confidence: 99%

See 2 more Smart Citations

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

View full text Add to dashboard Cite

Diamond-like Carbon coatings are well-known for their excellent wear and friction reducing properties. Novel DLCs are constantly being developed that further these beneficial characteristics; this is often achieved by incorporating a dopant into the microstructure of the DLC. One dopant that is widely used currently in commercial settings, including F1 car engines, is silicon. Si doping can be, to some extent, regarded as a double-edged sword. This is because, whilst it has been reported as being able to reduce friction in certain environments, this usually comes at the cost of far higher wear than the corresponding un-doped DLC. The fundamental aspects of Si-DLC's friction and wear properties are explored herein with the goal of optimising the coating using fundamental tribochemical knowledge.

show abstract

Section: Frictionsupporting

confidence: 81%

Section: /Spmentioning

confidence: 99%

See 1 more Smart Citation

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

View full text Add to dashboard Cite

show abstract

“…[11,12] The absence of additive reaction products can be explained by the formation of a carbon transfer layer, which through reduced friction reduces contact temperatures [13] and inhibits reaction of EP additive with the steel surface. [4] In the case of AW additive concentrations above 1.0%, the AW additive reacts with the surface of the uncoated steel ball, forming the same phosphorus-rich tribofilm and giving the same friction (∼0.2) as observed for the steel/steel combination.…”

Section: Surface Analysismentioning

confidence: 91%

Tribologically activated surface layers in lubricated DLC contacts

Podgornik

Vižintin

2008

Surface & Interface Analysis

View full text Add to dashboard Cite

In the past, adequate functionality of high-performance components would have been impossible without advanced lubricant additive chemistry and proper lubricant formulation. Especially anti-wear (AW) and extreme-pressure (EP) additives are crucial in minimising friction and wear and protecting contact surfaces under severe contact conditions. Introduction of diamond-like carbon (DLC) coatings, on the other hand, opens further possibilities in improving performance of highly loaded components, which can no longer be achieved only by lubricant design.The aim of the present research was to determine the mechanism responsible for the low-friction behaviour of boundary lubricated DLC coatings when lubricated with lubricants containing EP or AW additives and to investigate the influence of contact conditions. Tests were performed under reciprocating sliding motion using ball on flat test configuration, with ball-bearing steel ball being loaded against undoped and W-doped DLC-coated discs, respectively. Results of the investigation clearly show that in the case of W-doped DLC coatings, low-friction behaviour under boundary lubrication is governed by formation of WS 2 -containing tribolayers, which are contact conditions dependent and can reduce friction by more than 50%.

show abstract

“…[13], for instance, showed how regular arrays of dimples obtained via LST on DLC films were able to reduce the friction coefficient considerably under oil lubrication. In recent years, LST has become a key technology for enhancing specific tribological properties of DLC coatings [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Laser decoating of DLC films for tribological applications

Zivelonghi

Giorleo

Gelfi

et al. 2017

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Damaged DLC coatings usually require remanufacturing of the entire coated components starting from an industrial chemical de-coating step. Alternatively, a complete or local coating repair can be considered. To pursue this approach, however, a local coating removal is needed as first operation. In this context, controlled decoating based on laser sources can be a suitable and clean alternative to achieve a prefixed decoating depth with high accuracy. In the present study, we investigated a laser-based decoating process executed on multilayered DLC films for advanced tribological applications (deposited via a hybrid PVD/PE-CVD technique). The results were acquired via multifocal optical digital microscopy (MF-ODM), which allowed high-resolution 3D surface reconstruction as well as digital profilometry of the lasered and unlasered surface. The study identifies the most critical process parameters which influence the effective decoating depth and the postdecoating surface roughness. In particular, the role of pulse overlap (decomposed along orthogonal directions), laser fluence, number of lasing passes and assist gas is discussed in text. A first experimental campaign was designed to identify the best conditions to obtain full decoating of the DLC + DLC:Cr layers. It was observed that decreasing the marking speed to 200 mm/s was necessary to obtain a sufficient pulse overlap and a nearly planar ablation profile. By operating with microsecond pulses and 1 J/cm 2 (fairly above the ablation threshold), less than 10 passes were needed to obtain full decoating of the lasered area with an etching rate of 1.1 μm/loop. Further experiments were then executed in order to minimise the roughness of the rest surface with the best value found at around 0.2 μm. Limited oxidation but higher R a values were observed in Ar atmosphere.

show abstract

Tribological characteristics of Si-containing diamond-like carbon films under oil-lubrication

Cited by 61 publications

References 12 publications

Repressing oxidative wear within Si doped DLCs

Repressing oxidative wear within Si doped DLCs

Tribologically activated surface layers in lubricated DLC contacts

Laser decoating of DLC films for tribological applications

Contact Info

Product

Resources

About