Characteristics and tribological properties in water of Si-DLC coatings

Wu, Xingyang; Suzuki, Masahiro; Ohana, Tsuguyori; Tanaka, Akihiro

doi:10.1016/j.diamond.2007.09.007

Cited by 55 publications

(34 citation statements)

References 16 publications

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“…Another is that an adjustment of doping element content is extremely necessary for achieving the best tribological performance of the doped DLC:H coatings. This deduction can be further verified by the results in [26], as shown in Figure 2b. In deionized water, Ar-DLC:H coatings deposited at a bias voltage of −3.0 kV (a range from −0.5 to −3.0 kV) exhibited the lowest friction coefficient and coating wear rate (0.1 and 8.0 × 10 −9 mm 3 /Nm) [28], whilst Si-DLC:H (3.9 at % Si)/Si 3 N 4 and Si-DLC:H (7.3 at % Si)/AISI 440C tribopairs presented the lowest friction coefficient of 0.005 and 0.09, respectively [29,30].…”

Section: Architecturesupporting

confidence: 66%

“…Subsequently, the bonding strength between coatings and substrate was enhanced, and therefore, the tribological properties of DLC:H (a-C:H) and DLC (a-C) coatings in water were improved significantly. As shown in Figure 2a, Tanaka et al [25,26] demonstrated that the friction coefficient of the DLC:H/AISI 440C tribopair in deionized water was reduced after 0.24 at % F and 6.6 at % Si were incorporated into DLC coatings. On the contrary, Si-DLC:H (2.3 at % Si) and Si-DLC:H coatings yet exhibited a higher friction coefficient than that of pure DLC:H coatings mating with AISI 440C [26] and DLC:H [27] (see Figure 2a).…”

Section: Compositionmentioning

confidence: 99%

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Progress in Tribological Properties of Nano-Composite Hard Coatings under Water Lubrication

Wang

Zhou

2017

Lubricants

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Abstract:The tribological properties, under water-lubricated conditions, of three major nano-composite coatings, i.e., diamond-like carbon (DLC or a-C), amorphous carbon nitride (a-CN x ) and transition metallic nitride-based (TiN-based, CrN-based), coatings are reviewed. The influences of microstructure (composition and architecture) and test conditions (counterparts and friction parameters) on their friction and wear behavior under water lubrication are systematically elucidated. In general, DLC and a-CN x coatings exhibit superior tribological performance under water lubrication due to the formation of the hydrophilic group and the lubricating layer with low shear strength, respectively. In contrast, TiN-based and CrN-based coatings present relatively poor tribological performance in pure water, but are expected to present promising applications in sea water because of their good corrosion resistance. No matter what kind of coatings, an appropriate selection of counterpart materials would make their water-lubricated tribological properties more prominent. Currently, Si-based materials are deemed as beneficial counterparts under water lubrication due to the formation of silica gel originating from the hydration of Si. In the meantime, the tribological properties of nano-composite coatings in water could be enhanced at appropriate normal load and sliding velocity due to mixed or hydrodynamic lubrication. At the end of this article, the main research that is now being developed concerning the development of nano-composite coatings under water lubrication is described synthetically.

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Section: Architecturesupporting

confidence: 66%

Section: Compositionmentioning

confidence: 99%

Progress in Tribological Properties of Nano-Composite Hard Coatings under Water Lubrication

Wang

Zhou

2017

Lubricants

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“…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). Initial friction data for the samples tested start at a similar value.…”

Section: Frictionmentioning

confidence: 61%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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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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“…formation of a low shear silica gel, as described for Si-DLC sliding under water lubricated condition 3) , on a counterpart surface resulting in much higher friction coefficients compared to sliding under dry condition. In addition, the dissolution of silica, included in RH ceramics, from the contact interface in water would also contribute to increased wear of RH ceramics.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…RH ceramics are composed of mainly amorphous carbon and also include amorphous silica. It has been reported that Si-containing DLC (Si-DLC) show reduced friction in aqueous environment, due to tribochemical reaction with water, compared to DLC without Si 3) . Subsequently, in case of RH ceramics, it was considered that interaction of amorphous silica with water should in the same way result in improved friction and wear properties compared to dry condition.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Properties of Rice Husk Ceramics under Dry and Water Lubricated Conditions

et al. 2009

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The authors have developed the new hard porous carbon material "Rice Husk ceramics" (RH ceramics) by carbonizing the mixture of rice husk and phenol resin at 900 °C in inert gas environment. The RH ceramics are composed of amorphous carbon and amorphous silica, about 90 and 10 wt.%, respectively. The friction and wear properties of RH ceramics sliding against austenitic stainless steel (JIS SUS304) were evaluated under dry and water lubricated conditions using a ball-on-disk apparatus. The test results showed that RH ceramics have lower friction coefficients and specific wear rates under dry than under water lubricated condition. The friction coefficient took very low values of 0.06 to 0.11 under dry condition, whereas, it was 0.09 to 0.15 under water lubricated condition. The specific wear rate was less than 10 -8 mm 2 /N under both conditions, though it was much lower under dry than under water lubricated condition. Transmission electron microscopy with energy dispersive X-ray spectroscopy and electron diffraction analyses were employed to characterize the properties of the worn surfaces of SUS304 ball samples. It was found that the tribological behavior of RH ceramics is strongly governed by the characteristics of the transferred film formed on counterpart surfaces.

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Characteristics and tribological properties in water of Si-DLC coatings

Cited by 55 publications

References 16 publications

Progress in Tribological Properties of Nano-Composite Hard Coatings under Water Lubrication

Progress in Tribological Properties of Nano-Composite Hard Coatings under Water Lubrication

Repressing oxidative wear within Si doped DLCs

Friction and Wear Properties of Rice Husk Ceramics under Dry and Water Lubricated Conditions

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