Interpretation of friction and wear in DLC film: role of surface chemistry and test environment

Polaki, S. R.; Kumar, N.; Madapu, Kishore K.; Ganesan, K.; Krishna, Nanda Gopala; Srivastava, Sachin; Abhaya, S.; Kamruddin, M.; Dash, S.; Tyagi, A.K.

doi:10.1088/0022-3727/49/44/445302

Cited by 28 publications

(22 citation statements)

References 33 publications

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“…Meanwhile, ID/IG reflects that graphitization occurs appreciably in D1 film after 6000 sliding cycles. Thus, it illustrates some of C dangling bonds are passivated with groups dissociated from methane and others bond together in rings at first [44] result in higher hardness. Then more C dangling bonds bond together in rings.…”

Section: Analysis Of Wear Tracks and Wear Scarsmentioning

confidence: 95%

Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

et al. 2019

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Diamond-like carbon (DLC) films respond as a lubricating material under some atmosphere conditions, such as N 2 , moisture. Nevertheless, incomplete knowledge about the key factors, which control the performances of film under distinct gases, limits the further use of them. Herein, the tribological properties of DLC film and Cr/DLC multilayers with different modulation periods were studied under methane. Frictional tests conducted under methane show that Cr/ DLC film exhibits a great reduction in friction and wear compared to that of DLC film. An interpretation for tribological performances of films was proposed by considering repassivation and structural transformation taking place at the sliding interface. It is chemical passivation that plays a major role in the tribological properties of DLC film, while the Cr/ DLC multilayers possess the lower friction coefficient because of the structural transformation induced by shearing. This study is important for broadening applications of DLC film in the industrial field and reducing energy waste.

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Section: Analysis Of Wear Tracks and Wear Scarsmentioning

confidence: 95%

Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

et al. 2019

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“…Once the tribo-layer gets formed the friction coefficient for the hydrogenated coatings reached a steady value of around 0.05 after about 150 m, whereas the hydrogen free coatings maintained a friction coefficient of 0.1. The values of friction coefficient are characteristic for hard C coatings [38]. The introduction of hydrogen is known to reduce the friction coefficient for DLC coatings [39].…”

Section: Mechanical and Tribological Characterization Of Dlc On Metalmentioning

confidence: 99%

A Strategy for Alleviating Micro Arcing during HiPIMS Deposition of DLC Coatings

et al. 2020

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In this work, we investigate the use of high power impulse magnetron sputtering (HiPIMS) for the deposition of micrometer thick diamond like carbon (DLC) coatings on Si and steel substrates. The adhesion on both types of substrates is ensured with a simple Ti interlayer, while the energy of impinging ions is adjusted by using RF (Radio Frequency) biasing on the substrate at −100 V DC self-bias. Addition of acetylene to the working Ar+Ne atmosphere is investigated as an alternative to Ar sputtering, to improve process stability and coatings quality. Peak current is maintained constant, providing reliable comparison between different deposition conditions used in this study. The main advantages of adding acetylene to the Ar+Ne gas mixture are an increase of deposition rate by a factor of 2, when comparing to the Ar+Ne process. Moreover, a decrease of the number of surface defects, from ~40% surface defects coverage to ~1% is obtained, due to reduced arcing. The mechanical and tribological properties of the deposited DLC films remain comparable for all investigated gas compositions. Nanoindentation hardness of all coatings is in the range of 25 to 30 GPa, friction coefficient is between 0.05 and 0.1 and wear rate is in the range of 0.47 to 0.77 × 10−6 mm3 N−1m−1.

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“…Diamond is an indispensable material in mechanical and tribological applications because of its combined characteristics of extreme hardness and ultralow friction. Typically, the coefficient of friction (CoF) of polycrystalline diamond films ranges between high to ultralow value depending upon tribo test conditions [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Some of the parameters affecting the tribological properties of diamond are contact pressure, crystallographic orientation, counterbody and surface roughness of the film [13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Role of microstructure and structural disorder on tribological properties of polycrystalline diamond films

Ajikumar

Ganesan

Kumar

et al. 2019

Applied Surface Science

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Polycrystalline diamond films with systematic change in microstructure that varies from microcrystalline to nanocrystalline structure are synthesized on Si by hot filament chemical vapor deposition. The morphology and structural properties of the grown diamond films are analyzed using field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction and Raman spectroscopy. The average roughness and grain size of the diamond films decrease with increase in CH4 to H2 ratio from 0.5 to 3 %. Also, structural disorder in these diamond films increases with decrease in grain size as evidenced from Raman spectroscopy. The coefficient of friction (CoF) is found to be very low for all the films.However, the average CoF is found to increase from 0.011±0.005 to 0.03±0.015 as the grain size decrease from ~ 1 m down to ~20 nm. Post analysis of wear track by FESEM, AFM based nanoscale friction and Raman spectroscopy reveal that microcrystalline diamond undergoes shear induced amorphization with negligible wear rate while nanocrystalline diamond films undergo shear induced plastic deformation without amorphization. A comprehensive mechanism for the observed CoF is discussed in the framework of microstructure, structural disorder and shear induced tribo-chemical reactions at the sliding interface.

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Interpretation of friction and wear in DLC film: role of surface chemistry and test environment

Cited by 28 publications

References 33 publications

Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

A Strategy for Alleviating Micro Arcing during HiPIMS Deposition of DLC Coatings

Role of microstructure and structural disorder on tribological properties of polycrystalline diamond films

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