Diamond-like carbon coatings in rolling contacts

Sjöström, H.; Wikström, Victoria

doi:10.1243/1350650011543790

Cited by 19 publications

(4 citation statements)

References 57 publications

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“…[2][3][4] Commercial use of WC/ a-C: H films in particular has been widespread. Nanocrystalline tungsten carbide ͑ϳ2-4 nm precipitates͒ in mixed sp 3 / sp 2 amorphous C-H matrices was characterized using the combination of three-dimensional atom probe ͑3DAP͒ tomography and transmission electron microscopy.…”

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confidence: 99%

Atomic-scale structure and composition of tungsten carbide reinforced diamondlike carbon films

Scharf

Romanes

Mahdak

et al. 2008

Applied Physics Letters

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confidence: 99%

Atomic-scale structure and composition of tungsten carbide reinforced diamondlike carbon films

Scharf

Romanes

Mahdak

et al. 2008

Applied Physics Letters

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“…[21][22][23][24][25][26] The DLC coatings have high hardness and low chemical affinity, resulting in excellent wear resistance. [27][28][29][30] In addition, the DLC coatings exhibit low friction due to unique amorphous carbonaceous structures. [31][32][33] Several studies show that DLC coatings exhibit low friction (<0.05) under some dry conditions.…”

Section: Introductionmentioning

confidence: 99%

Development of a new diamond-like carbon surface treatment method with electric discharge for short running-in and friction reduction

Murashima

Maeda

Deng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present paper proposes a new treatment method for diamond-like carbon (DLC) coatings using electric discharge. DLC coatings exhibit excellent mechanical and tribological properties due to their unique carbonaceous structure. Several surface treatment methods were presented to achieve short running-in and low friction. However, in-situ surface treatment is needed to extend the life of machines and maintain their performance. Here, we propose an electric discharge treatment with a simple electrical circuit. As a result, the friction coefficient drastically drops from 0.3 to 0.11. Interestingly, the drop starts shortly after the discharge starts. Consequently, the running-in is shortened to about 6-m sliding compared to no discharge condition, which does not show any running-in more than 68-m sliding. Raman analysis reveals that a transfer layer on the ball surface is composed of carbonaceous material and the structure exhibits graphite-like characteristics. However, there is visible damage on the DLC surface. Another friction test shows a very low friction coefficient of 0.04 using a transfer layer-covered ball and a new DLC disk with a smooth surface. In conclusion, the combination of a transfer layer and smooth DLC surface is needed to exhibit excellent tribological performance, indicating the importance of less damage treatment. Next, pulse discharge treatment is demonstrated to achieve less damage to the DLC coating. As a result, the pulse discharge method reduces friction and surface damage. In conclusion, the proposed treatment methods using electric discharge not only show the potential for reducing friction, but also the feasibility of in-situ treatment during machine operation.

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“…This property is often observed during characterization tests in dry or lubricated contact under basic solicitations like fretting, sliding, rolling-sliding, etc... Many studies pointed DLC damage and wear processes depend on the atmosphere, on their thickness, their microstructure (hydrogenated or not, doped or not, mono or multi-layered) and on their interface quality with the substrate [2,3,4,5]. Nevertheless, few studies focus on the influence of combined, variable or complex loadings on the coating lifetime.…”

Section: Introductionmentioning

confidence: 99%