Tribological properties of ta-CNx coating sliding against steel and sapphire in unlubricated condition

Liu, Xiaoxu; Umehara, Noritsugu; Tokoroyama, Takayuki; Murashima, Motoyuki

doi:10.1016/j.triboint.2018.10.022

Cited by 38 publications

(16 citation statements)

References 33 publications

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“…For these tests, a holder was manufactured (Fig. 3) with a needle support for loading the sample [7].…”

Section: Resultsmentioning

confidence: 99%

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Tribological Properties of Sapphire under Dry Friction against Chromium and Zirconium Ceramics

Alisin

2022

Materials Research Proceedings

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Abstract. The issues of sapphire friction and wear in contact with chrome steel and zirconium ceramics are discussed in this article. The kinetic microindentation method is used to study the mechanical properties of sapphire in frictional contact in modelling experiments on the indentation of a Vickers indent. Taking into account the anisotropy of the mechanical properties of sapphire, the influence of the load and orientation of the indent on the modulus of elasticity and hardness is analyzed. It has been established that, under dry friction conditions it is promising the use of zirconium ceramics in the supports of devices operating under conditions in which the use of lubricants is impossible. The possibility of using a friction couple of sapphire-zirconium ceramics in friction units operating in open space is noted.

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“…For these tests, a holder was manufactured (Fig. 3) with a needle support for loading the sample [7].…”

Section: Resultsmentioning

confidence: 99%

“…A new scheme for cutting sapphire with a diamond wire saw is proposed. Work [7] is devoted to the study of dry friction of amorphous carbon nitride on sapphire and steel. A strong influence of atmospheric humidity on friction and wear has been established.…”

Section: Tribological Properties Of Sapphire Under Dry Friction Against Chromium and Zirconium Ceramicsmentioning

confidence: 99%

Tribological Properties of Sapphire under Dry Friction against Chromium and Zirconium Ceramics

Alisin

2022

Materials Research Proceedings

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“…Liu et al revealed that a nitrogen contained DLC exhibited excellent tribological characteristics even at lower hardness [15]. The characteristics are considered to be provided due to a smooth surface of the nitrogen contained DLC [16]. Other surfaces have texturing to improve tribological properties [17,18].…”

Section: Introductionmentioning

confidence: 99%

Realization of a Novel Morphing Surface Using Additive Manufacturing and Its Active Control in Friction

Murashima

Imaizumi

Kawaguchi

et al. 2021

Journal of Tribology

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As the need for higher efficiency of engineering components increases, so does the demand for functional surfaces. While various tribosurfaces (e.g., texturing and coatings) have been developed, many researches are aimed at static functionality. On the other hand, due to a wide range of environmental adaptability and active control, active-morphing surfaces can be highly efficient and robust. In this paper, we demonstrate a novel morphing surface and its realization using additive manufacturing (AM). By using a diaphragm structure, morphing performance is achieved even if a hard resin material is used. When air pressure is applied to the backside of the diaphragm, it changes to a convex shape, and vice versa. The concept requires a complex structure for arranging airflow and a solid morphing system. The AM is one great technique to create such complex structure. As a result of actual manufacturing, the created morphing structure realizes a large morphing of 600 µm or more. In addition, the shape changes reversibly depending on the air pressure. The surface also exhibits very interesting tribological characteristics. The surface shows a friction coefficient of 0.5-1.7 with a convexity, and then decreases to about 0.3 with a concavity. A real-contact area measurement reveals that the novel property occurs due to change in the real-contact area depending on surface morphology. In conclusion, the present paper provides a new concept of a novel morphing tribosurface, which selectively performs as a low-friction or break-like surface, created using AM.

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“…Other research studies show that the nitride-contained DLC coatings provide a smooth surface due to their tough structure, resulting in low friction under lubricating conditions. [43][44][45] The CNx tribosystem is a successful example of achieving excellent structural control and reducing friction by promoting sp 2 structures. Another well-known doping element in DLC coatings is silicon.…”

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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Tribological properties of ta-CNx coating sliding against steel and sapphire in unlubricated condition

Cited by 38 publications

References 33 publications

Tribological Properties of Sapphire under Dry Friction against Chromium and Zirconium Ceramics

Tribological Properties of Sapphire under Dry Friction against Chromium and Zirconium Ceramics

Realization of a Novel Morphing Surface Using Additive Manufacturing and Its Active Control in Friction

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

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