Investigating atomic structure of thin carbon film under mechanical stress and frictional heat generation

He, Muyang; Lee, Sung-Ae; Yeo, Chang Dong

doi:10.1016/j.surfcoat.2014.11.057

Cited by 15 publications

(3 citation statements)

References 32 publications

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“…He et al investigated the wear on the scratched and burnished DLC films on a head slider in HDD through micro-Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and nano-scratch experiments. Their results confirmed that the thermal degradation (i.e., graphitization) of DLC film could be caused by the mechanical stress and frictional temperature rise during the sliding surface contact [12]. In the HDD industry, amorphous DLC film has always been a crucial technology to secure head-media-spacing (HMS) budget and improve product reliability.…”

Section: Introductionmentioning

confidence: 75%

Evaluation of Thermal Degradation of DLC Film Using a Novel Raman Spectroscopy Technique

Yeo

2018

Coatings

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Diamond-like carbon (DLC) films are extensively used in various industries due to their superior protective and lubrication properties. However, DLC films including sp 2 and sp 3 carbon bonding are metastable materials, which can be thermally degraded (or graphitized) at elevated temperature. In this study, a novel Raman spectroscopy technique was developed to evaluate the in-situ thermal stability of DLC films. When a laser beam is applied onto a DLC film, the surface temperature can increase depending on the laser power, laser duration time, and surface reflectivity. Based on this laser heating concept, the Raman spectrum data of DLC films (i.e., G peak position and width) were obtained at the controlled Raman laser power, which enabled to determine the critical temperature to initiate the thermal degradation of DLC films. Two different designs of DLC film (i.e., types A and B with different initial sp 2 -to-sp 3 ratio) were prepared and their thermal stability was evaluated using the proposed Raman spectroscopy technique. From the systematic data analysis and comparison, it could be observed that the type-A DLC film showed the significant change of Raman parameters (i.e., G peak position and width) at lower laser power value (=lower temperature) than the type-B DLC film, which indicated that the type-B DLC film had better thermal stability.

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Section: Introductionmentioning

confidence: 75%

Evaluation of Thermal Degradation of DLC Film Using a Novel Raman Spectroscopy Technique

Yeo

2018

Coatings

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“…For example, the majority of the diamond-like carbon coatings including both hydrogen-free (a-C) and hydrogenated (a-C:H) have low adhesive bond strength with the substrate and a high level of residual stresses, which are aggravated by increasing DLC coatings' thickness [10][11][12][13][14]. In addition, a significant limitation of the coatings' application areas is related to their relatively low thermal stability, which results in the coatings rapidly losing their properties under conditions of exposure to high thermal loads on the contact surfaces [15,16].…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Silicon-Containing Diamond-like Carbon Coatings on the Wear Resistance of SiAlON Tool Ceramics

Волосова

Okunkova

2023

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DLC coatings have low adhesive bond strength with the substrate and a high level of residual stresses. This paper is devoted to researching a complex of characteristics of a DLC-Si coating deposited on samples of SiAlON ceramics with intermediate coatings (CrAlSi)N pre-formed to improve the adhesive bond strength employing vacuum-plasma spraying. DLC-Si coatings were formed by chemical vapor deposition in a gas mixture of acetylene, argon, and tetramethylsilane supplied through a multichannel gas purge system controlling the tetramethylsilane volume by 1, 4, 7, and 10%. The SiAlON samples with deposited (CrAlSi)N/DLC-Si coatings with different silicon content in the DLC layer were subjected to XPS and EDX analyses. Tribological tests were carried out under conditions of high-temperature heating at 800C. The nanohardness and elasticity modulus of the rational (CrAlSi)N/DLC-Si coating with Si-content of 4.1% wt. were 26 ± 1.5 GPa and 238 ± 6 GPa, correspondingly. The rational composition of (CrAlSi)N/DLC-Si coating was deposited on cutters made of SiAlON ceramics and tested in high-speed machining of aircraft nickel-chromium alloy compared to uncoated and DLC-coated samples. The average operating time (wear resistance) of (CrAlSi)N/DLC-Si(4.1% wt.)-coated end mills before reaching the accepted failure criterion was 15.5 min when it was 10.5 min for the original cutters.

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“…It is well known that the graphitization process is a key factor accompanying the use of DLC film [27] and graphitized wear debris at the nanometer scale is generated along the interface of DLC [28][29][30][31][32]. In this study, graphite nanoparticles (GNs) were chosen to simulate the DLC debris produced in vitro, and the dose-dependent cytotoxicity of GNs was studied to provide more information on the effects of DLC film application on artificial joints.…”

Section: Introductionmentioning

confidence: 99%

Dose-dependent cytotoxicity evaluation of graphite nanoparticles for diamond-like carbon film application on artificial joints

Liao

Deng

et al. 2017

Biomed. Mater.

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While a diamond-like carbon (DLC)-coated joint prosthesis represents the implant of choice for total hip replacement in patients, it also leads to concern due to the cytotoxicity of wear debris in the form of graphite nanoparticles (GNs), ultimately limiting its clinical use. In this study, the cytotoxicity of various GN doses was evaluated. Mouse macrophages and osteoblasts were incubated with GNs (<30 nm diameter), followed by evaluation of cytotoxicity by means of assessing inflammatory cytokines, results of alkaline phosphatase assays, and related signaling protein expression. Cytotoxicity evaluation showed that cell viability decreased in a dose-dependent manner (10-100 μg ml), and steeply declined at GNs concentrations greater than 30 μg ml. Noticeable cytotoxicity was observed as the GN dose exceeded this threshold due to upregulated receptor of activator of nuclear factor kB-ligand expression and downregulated osteoprotegerin expression. Meanwhile, activated macrophage morphology was observed as a result of the intense inflammatory response caused by the high doses of GNs (>30 μg ml), as observed by the increased release of TNF-α and IL-6. The results suggest that GNs had a significant dose-dependent cytotoxicity in vitro, with a lethal dose of 30 μg ml leading to dramatic increases in cytotoxicity. Our GN cytotoxicity evaluation indicates a safe level for wear debris-related arthropathy and could propel the clinical application of DLC-coated total hip prostheses.

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Investigating atomic structure of thin carbon film under mechanical stress and frictional heat generation

Cited by 15 publications

References 32 publications

Evaluation of Thermal Degradation of DLC Film Using a Novel Raman Spectroscopy Technique

Evaluation of Thermal Degradation of DLC Film Using a Novel Raman Spectroscopy Technique

Study of the Influence of Silicon-Containing Diamond-like Carbon Coatings on the Wear Resistance of SiAlON Tool Ceramics

Dose-dependent cytotoxicity evaluation of graphite nanoparticles for diamond-like carbon film application on artificial joints

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