Estimation of DLC Wear Process by Micro Laser Raman Spectroscopy

Kawaguchi, Masahiro; Aoki, Saiko; Mitsuo, Atsushi; Morikawa, Kazuo; Uchida, Satoshi; Choi, Junho; Kato, Takahisa

doi:10.2474/trol.3.110

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…4(b). In both cases, the D peak between 1300 cm -1 and 1400 cm -1 , attributed to a disordered structure, and the G peak between 1500 cm -1 and 1600 cm -1 , attributed to a graphite structure, can be observed [12][13][14]. As shown in Fig.…”

Section: Structural Change Caused By Heatingmentioning

confidence: 68%

Effects of Applied Heat and Stress on Structural Changes of DLC Film

et al. 2012

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Diamond-like carbon (DLC) is considered to be predominantly amorphous, whereby small clusters of microcrystalline structures with sp 3 and sp 2 bonding, and an amorphous matrix, coexist. DLC film has some extraordinary properties such as high hardness, low friction, and high wear resistance. There is strong demand for the use of such DLC properties in a wide range of tribological applications, including cutting tools, mechanical elements of automobiles, die surfaces, and computer hard disks. On the other hand, it is widely known that changes in the structure of DLC film during sliding affect its tribological properties. However, the precise mechanism of the structural change remains unclear. In this study, the effects of applied heat and stress on the structural changes of DLC films were investigated to evaluate the predominant factor in this mechanism. DLC film was deposited on a steel substrate using plasma-based ion implantation and deposition. After heat treatment with applied force, structural changes of the DLC film were investigated by micro-laser Raman spectroscopy. Structural change was confirmed in DLC film annealed at temperatures over 648 K. This suggests that hydrogen evolution from the DLC film possibly caused the structural change. Greater hydrogen evolution was observed from the unloaded surface compared to the loaded area. Structural change was found to be dependent on the stress field: The tensile stress led to structural change, but the compressive stress field did not affect the structural change. These results indicate that a structural change in DLC film caused by heat treatment can be suppressed by preventing hydrogen evolution from the surface of the film.

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Section: Structural Change Caused By Heatingmentioning

confidence: 68%

Effects of Applied Heat and Stress on Structural Changes of DLC Film

et al. 2012

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“…The inside and outside of the wear track of the H-free DLC coating from tests at 50 N load for each ionic liquid were analyzed. In this study, the degree of graphitization was estimated by G intensities [23][24][25][26][27]. We defined the G-peak at approximately 1550 cm −1 .…”

Section: Raman Spectroscopy Analysis Resultsmentioning

confidence: 99%

Lubrication Mechanism of Halogen-Free Ionic Liquids

et al. 2017

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Ionic liquids have potential for use as novel high-performance lubricants because of their attractive characteristics such as low volatility, high-thermal stability, and oxidation stability. It is known that ionic liquids exhibit excellent lubricity for metals because of halogen constituents in their molecular structure. However, occurrence of corrosive damage on the contacting surfaces lubricated with the ionic liquids has also been reported. To prevent damage due to corrosion, it is necessary to use halogen-free ionic liquids whose lubricity may be inferior compared with that of halogen-containing ionic liquids. In this study, the lubricity of halogen-free ionic liquids 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCN]) and 1-butyl-3-methylimidazolium tricyanomethane ([BMIM][TCC]) was evaluated by using a reciprocating sliding friction and wear tester (SRV Optimol)) using an oscillating steel cylinder on H-free DLC disk test configuration under boundary lubrication conditions. The SRV test results showed that H-free DLC with [BMIM][TCC] at 50N exhibited superior lubricity than that with [BMIM][DCN] at the same load. In order to understand the observed, the worn surfaces of test specimens were analyzed by using Raman spectroscopy, the friction coefficient of the film by atomic force microscopy (AFM), and the chemical composition by time of flight secondary ion mass spectrometry (TOF-SIMS

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Estimation of DLC Wear Process by Micro Laser Raman Spectroscopy

Cited by 2 publications

References 23 publications

Effects of Applied Heat and Stress on Structural Changes of DLC Film

Effects of Applied Heat and Stress on Structural Changes of DLC Film

Lubrication Mechanism of Halogen-Free Ionic Liquids

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