Friction, wear and N2-lubrication of carbon nitride coatings: a review

Kato, Koji; Umehara, Noritsugu; Adachi, K.

doi:10.1016/s0043-1648(03)00334-x

Cited by 143 publications

(93 citation statements)

References 13 publications

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“…Due to S incorporation the hardness decreased from 13 to 8 GPa. The positive nitrogen effect on sliding DLC under different conditions and environments has also been reported [74] [51]. Ultra and super low CoFs were measured.…”

Section: Environmental Effects and Superlubricity Of Dlc Coatingssupporting

confidence: 61%

On the design of lubricant free piston compressors

Owczarek¹

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Section: Environmental Effects and Superlubricity Of Dlc Coatingssupporting

confidence: 61%

On the design of lubricant free piston compressors

Owczarek¹

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“…Concerted efforts by Kato and his co-workers have resulted in the synthesis of a superlow friction version of CN x films [38,39]. Specifically, when tested in dry nitrogen (after a brief run-in or surface conditioning stage in oxygen), such films could provide friction coefficients of as low as 0.005.…”

Section: Superlubricity In Doped Dlc Filmsmentioning

confidence: 99%

Achieving superlubricity in DLC films by controlling bulk, surface, and tribochemistry

2014

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Superlubricity refers to a sliding regime in which contacting surfaces move over one another without generating much adhesion or friction [1]. From a practical application point of view, this will be the most ideal tribological situation for many moving mechanical systems mainly because friction consumes large amounts of energy and causes greenhouse gas emissions [2]. Superlubric sliding can also improve performance and durability of these systems. In this paper, we attempt to provide an overview of how controlled or targeted bulk, surface, or tribochemistry can lead to superlubricity in diamond-like carbon (DLC) films. Specifically, we show that how providing hydrogen into bulk and near surface regions as well as to sliding contact interfaces of DLC films can lead to super-low friction and wear. Incorporation of hydrogen into bulk DLC or near surface regions can be done during deposition or through hydrogen plasma treatment after the deposition. Hydrogen can also be fed into the sliding contact interfaces of DLCs during tribological testing to reduce friction. Due to favorable tribochemical interactions, these interfaces become very rich in hydrogen and thus provide super-low friction after a brief run-in period. Regardless of the method used, when sliding surfaces of DLC films are enriched in hydrogen, they then provide some of the lowest friction coefficients (i.e., down to 0.001). Time-of-flight secondary ion mass spectrometer (TOF-SIMS) is used to gather evidence on the extent and nature of tribochemical interactions with hydrogen. Based on the tribological and surface analytical findings, we provide a mechanistic model for the critical role of hydrogen on superlubricity of DLC films.

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“…The first is to change the properties of the friction surfaces so they have incommensurate contact or interfacial interaction (solid superlubricity). This method is used in manufacturing diamond-like carbon (DLC) film [8], MoS 2 film [9], and CN x film [10]. The second method is to add a lubricant between the two friction surfaces to separate them (liquid superlubricity).…”

Section: Introductionmentioning

confidence: 99%

Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

Zhang

Deng

et al. 2014

Friction

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Abstract:In this study, we address the superlubricity behavior of sapphire against ruby (or sapphire against itself) under phosphoric acid solution lubrication. An ultra-low friction coefficient of 0.004 was obtained under a very high contact pressure, with a virgin contact pressure up to 2.57 GPa. Related experiments have indicated that the load, sliding speed, and humidity of the test environment can affect superlubricity to some degree, so we tested variations in these conditions. When superlubricity appears in this study a thin film is present, consisting of a hydrogen bond network of phosphoric acid and water molecules adsorbed on the two friction surfaces, which accounts for the ultra-low friction. Most significantly, the wear rate of the sapphire and ruby in the friction process is very slow and the superlubricity state is very stable, providing favorable conditions for future technological applications.

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Friction, wear and N2-lubrication of carbon nitride coatings: a review

Cited by 143 publications

References 13 publications

On the design of lubricant free piston compressors

On the design of lubricant free piston compressors

Achieving superlubricity in DLC films by controlling bulk, surface, and tribochemistry

Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication

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