Tribochemistry of silicon and oxygen doped, hydrogenated Diamond-like Carbon in fully-formulated oil against low additive oil

Lanigan, Joseph; Zhao, Hongyuan; Morina, Ardian; Neville, Anne

doi:10.1016/j.triboint.2014.03.019

Cited by 17 publications

(13 citation statements)

References 27 publications

(47 reference statements)

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“…The wear rate for the Si‐DLC and W‐DLC coatings are higher when tested in fully formulated oil than in base oil. This is possibly due to an adverse reaction with the silicon and tungsten dopants within the oil that has been reported by other authors; however, some authors present an improvement in wear rates when the DLC incorporates silicon …”

Section: Resultsmentioning

confidence: 79%

The influence of anti‐wear additive ZDDP on doped and undoped diamond‐like carbon coatings

Austin

Liskiewicz

Kolev

et al. 2015

Surface & Interface Analysis

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Diamond-like carbon (DLC) coatings are recognised as a promising way to reduce friction and improve wear performance of automotive engine components. DLC coatings provide new possibilities in the improvement of the tribological performance of automotive components beyond what can be achieved with lubricant design alone. Lubricants are currently designed for metallic surfaces, the tribology of which is well defined and documented. DLC does not share this depth of tribological knowledge; thus, its practical implementation is stymied. In this work, three DLC coatings are tested: an amorphous hydrogenated DLC, a silicone-doped amorphous hydrogenated DLC and a tungsten-doped amorphous hydrogenated DLC. The three coatings are tested tribologically on a pin-onreciprocating plate tribometer against a cast iron pin in a group III base oil, and a fully formulated oil that consists of a group III base oil and contains ZDDP, at 100 °C for 6 h and for 20 h in order to determine whether a phosphor-based tribofilm is formed at the contact.The formation of a tribofilm is characterised using atomic force microscopy and X-ray photoelectron spectroscopy techniques. The main findings of this study are the formation of a transfer film at the un-doped, amorphous hydrogenated DLC surface, and also the tungsten amorphous hydrogenated DLC having a significant wear removal during the testing. The three coatings were found to have differing levels of wear, with the tungsten-doped DLC showing the highest, the silicon-doped DLC showing some coating removal and the amorphous hydrogenated DLC showing only minimal signs of wear

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Section: Resultsmentioning

confidence: 79%

The influence of anti‐wear additive ZDDP on doped and undoped diamond‐like carbon coatings

Austin

Liskiewicz

Kolev

et al. 2015

Surface & Interface Analysis

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“…This could be hugely beneficial as Si dopants increase coating adherence to the substrate and alter many of the parameters listed above (7,11,30). Being able to effectively include all of Si's beneficial properties into the DLC coating without the intrinsic increase in wear would be an excellent prospect for DLCs within many applications.…”

Section: Discussionmentioning

confidence: 99%

“…This effect is seen in many different types of Si-DLCs regardless of the source gases, % Si content or inclusion of oxygen. The mechanism of accelerated wear within SiDLCs was explored extensively with XPS and ToF-SIMS in previous work (11). In order to stabilise Si-DLCs with respect to wear the coating needs to have greater oxidative stability as silicon within a carbon matrix has a propensity to oxidise as there is a strong thermodynamic driving force for this reaction (12).…”

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%

“…The main mechanism for reduced friction in Si-DLC contacts is identified as being caused by production of SiOx species. These are often referred to as silicon rich oxide debris (2,4,11,38). This debris represents oxidative destruction and removal of Si within the coating which in turn amplifies wear of the DLC as a whole.…”

Section: Proposed Mechanism Of Wear Repressionmentioning

confidence: 99%

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Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

Self Cite

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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.

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Wear behavior of chromium nitride coating in dry condition at lower sliding velocity and load

Singh

Chattopadhyaya

Pramanik

et al. 2017

Int J Adv Manuf Technol

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The wear behavior of the chromium nitride (CrN) coating on piston ring material against liner material was investigated under dry conditions at room temperatures. Cat iron alloy, widely used in manufacturing of piston rings and cylinder liners, further it was coated by physical vapour deposition method. Wear tests were carried out on a Pin on Disc tribometer, Simultaneous effect of sliding velocities (0.3, 0.4, 0.6 & 0.8 m/s) and corresponding loads (10, 20, 30 & 40 N) on wear rate, friction coefficient and temperature were analyzed. In conclusion, Specific wear rate is decreasing by increase in load and velocity. The rise of temperature is 28 0 C to 42°C at the wear track room temperature resulted in a reduced coefficient of friction (COF) when the increase of load from10 to 40N.The wear mechanism is mixed mode such as three body abrasion and oxidation wear for dry conditions.

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Tribochemistry of silicon and oxygen doped, hydrogenated Diamond-like Carbon in fully-formulated oil against low additive oil

Cited by 17 publications

References 27 publications

The influence of anti‐wear additive ZDDP on doped and undoped diamond‐like carbon coatings

The influence of anti‐wear additive ZDDP on doped and undoped diamond‐like carbon coatings

Repressing oxidative wear within Si doped DLCs

Wear behavior of chromium nitride coating in dry condition at lower sliding velocity and load

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