Tribological properties of multilayer tetrahedral amorphous carbon coatings deposited by filtered cathodic vacuum arc deposition

Jang, Young-Soo; Kim, Jae-Il; Lee, Wooyoung; Kim, Jong‐Kuk

doi:10.1007/s40544-020-0476-y

Cited by 17 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Diamond-like carbon (DLC) films are well known for their superior mechanical properties, chemical inertness, and especially excellent self-lubricating performance [1,2], and they have been widely accepted as one of the most promising self-lubricating protective layers in mechanical systems [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Recently, it was reported that sufficient hydrogen incorporation can make DLC films capable of achieving near-frictionless sliding state with an extremely low friction coefficient (below 0.01) and negligible wear when rubbed in dry inert atmosphere such as nitrogen, carbon dioxide, and argon [3,[20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Ion energy-induced nanoclustering structure in a-C:H film for achieving robust superlubricity in vacuum

Chen

Zhang

et al. 2022

Friction

View full text Add to dashboard Cite

Hydrogenated amorphous carbon (a-C:H) films are capable of providing excellent superlubricating properties, which have great potential serving as self-lubricating protective layer for mechanical systems in extreme working conditions. However, it is still a huge challenge to develop a-C:H films capable of achieving robust superlubricity state in vacuum. The main obstacle derives from the lack of knowledge on the influencing mechanism of deposition parameters on the films bonding structure and its relation to their self-lubrication performance. Aiming at finding the optimized deposition energy and revealing its influencing mechanism on superlubricity, a series of highly-hydrogenated a-C:H films were synthesized with appropriate ion energy, and systematic tribological experiments and structural characterization were conducted. The results highlight the pivotal role of ion energy on film composition, nanoclustering structure, and bonding state, which determine mechanical properties of highly-hydrogenated a-C:H films and surface passivation ability and hence their superlubricity performance in vacuum. The optimized superlubricity performance with the lowest friction coefficient of 0.006 coupled with the lowest wear rate emerges when the carbon ion energy is just beyond the penetration threshold of subplantation. The combined growth process of surface chemisorption and subsurface implantation is the key for a-C:H films to acquire stiff nanoclustering network and high volume of hydrogen incorporation, which enables a robust near-frictionless sliding surface. These findings can provide a guidance towards a more effective manipulation of self-lubricating a-C:H films for space application.

show abstract

Section: Introductionmentioning

confidence: 99%

Ion energy-induced nanoclustering structure in a-C:H film for achieving robust superlubricity in vacuum

Chen

Zhang

et al. 2022

Friction

View full text Add to dashboard Cite

show abstract

“…In light of the design and construction for multilayered DLC films, it is of great significance to realize the synergistic combination of different properties from the individual sublayers and to enhance the load bearing capacities without sacrificing its superlubricious properties. 31,32 Theoretical studies indicated an assessment method for estimating the ability of the load bearing capacity under the heavy-load operating conditions, which was related to the stress field adaptation relationship between the film and substrate of the multilayer films. 33,34 films, a concept of the stress relaxation caused by cracks, warps, and deformations at the interface of the substrate and the films and closely associated with the mismatched strain energy was brought forward to evaluate the load bearing capacity of the multilayered films.…”

Section: Introductionmentioning

confidence: 99%

“…This excellent tribological performance strongly depended on the effect of H 2 gas lubrication and the strong H-passivation effect and the transfer film formed at the contact interfaces, which directly resulted in a reduction of the surface adhesive force. In light of the design and construction for multilayered DLC films, it is of great significance to realize the synergistic combination of different properties from the individual sublayers and to enhance the load bearing capacities without sacrificing its superlubricious properties. , Theoretical studies indicated an assessment method for estimating the ability of the load bearing capacity under the heavy-load operating conditions, which was related to the stress field adaptation relationship between the film and substrate of the multilayer films. , Based on the WC/C nanocomposite films, a concept of the stress relaxation caused by cracks, warps, and deformations at the interface of the substrate and the films and closely associated with the mismatched strain energy was brought forward to evaluate the load bearing capacity of the multilayered films . Under the ultrahigh contact stress conditions, the proposed threshold value of the mismatched strain energy of interfaces between the films and the substrate will be a quantitative evaluation way to understand the limitations of stress resistance of the well-designed multilayered DLC films.…”

Section: Introductionmentioning

confidence: 99%

Genesis of Superlow Friction in Strengthening Si-DLC/PLC Nanostructured Multilayer Films for Robust Superlubricity at Ultrahigh Contact Stress

Deng

Wang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Diamond-like carbon (DLC) films have significant potential to provide solutions for the friction reduction and the lubricity problem of mechanical moving friction pairs. However, the realization of excellent lubrication or even superlubricity and long lifetime under heavy loading conditions is still a great challenge, which is crucial for the applications of DLC in harsh environments. Here, we construct a group of property-strengthening Si-DLC/PLC multilayer films that could withstand ultrahigh contact stresses and achieve robust superlubricity. Under a peak Hertz contact stress of up to 2.37 GPa, the setup of a bilayer thickness of 324 nm enables the multilayered film (an overall film thickness of 1.53 μm) to achieve a superlow coefficient of friction toward 0.001 and an ultralow wear rate of 3.13 × 10–9 mm3/Nm. An alternating load reciprocating friction test emphasizes that this strengthening nanostructured Si-DLC/PLC multilayer possesses a kind of load self-adaptation because of its in situ nanoclustering transformation and local ordering of sp2-C phases at the sliding interface. The genesis of self-adaptation to the applied load is evaluated comprehensively to reveal its strengthening and toughening structural characteristics and robustness of the near-zero friction and wear features. The findings provide a significant design criterion for carbon-based solid lubricants applicable to harsh loading environments.

show abstract

“…An example is aluminum oxide, which exhibits lower wear rates, as well as a more constant friction behavior, when compared to silicon nitride and steel [ 11 ]. Multilayering soft and hard ta-C coatings may be another way to improve wear performance and mechanical properties in general [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Friction of ta-C Coatings Paired with Brass and Other Materials under Vacuum and Atmospheric Conditions

et al. 2022

View full text Add to dashboard Cite

Vacuum environments provide challenging conditions for tribological systems. MoS2 is one of the materials commonly known to provide low friction for both ambient and vacuum conditions. However, it also exhibits poor wear resistance and low ability to withstand higher contact pressures. In search of wear-resistant alternatives, superhard hydrogen-free tetrahedral amorphous carbon coatings (ta-C) are explored in this study. Although known to have excellent friction and wear properties in ambient atmospheres, their vacuum performance is limited when self-paired and with steel. In this study, the influence of the paired material on the friction behavior of ta-C is studied using counterbodies made from brass, bronze, copper, silicon carbide, and aluminum oxide, as well as from steel and ta-C coatings as reference materials. Brass was found to be the most promising counterbody material and was further tested in direct comparison to steel, as well as in long-term performance experiments. It was shown that the brass/ta-C friction pair exhibits low friction (µ < 0.1) and high wear in the short term, irrespective of ambient pressure, whereas in the long term, the friction coefficient increases due to a change in the wear mechanism. Al2O3 was identified as another promising sliding partner against ta-C, with a higher friction coefficient than that of brass (µ = 0.3), but considerably lower wear. All other pairings exhibited high friction, high wear, or both.

show abstract

Tribological properties of multilayer tetrahedral amorphous carbon coatings deposited by filtered cathodic vacuum arc deposition

Cited by 17 publications

References 26 publications

Ion energy-induced nanoclustering structure in a-C:H film for achieving robust superlubricity in vacuum

Ion energy-induced nanoclustering structure in a-C:H film for achieving robust superlubricity in vacuum

Genesis of Superlow Friction in Strengthening Si-DLC/PLC Nanostructured Multilayer Films for Robust Superlubricity at Ultrahigh Contact Stress

Low-Friction of ta-C Coatings Paired with Brass and Other Materials under Vacuum and Atmospheric Conditions

Contact Info

Product

Resources

About