Structure and properties of Si and N co-doping on DLC film corrosion resistance

Zhao, Qingping; Kang, Shumei; Zou, Fangzheng; Huo, Zhaokang

doi:10.1016/j.ceramint.2022.09.178

Cited by 15 publications

(5 citation statements)

References 30 publications

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“…The trend in G peak width variations indicates that the introduction of a certain amount of nitrogen during DLC fabrication can enhance the sp 3 content in the films. Previous studies have established an inverse correlation between the C sp 3 fraction in the films and the ID/IG ratio [17], where ID/IG represents the intensity ratio of the D peak to that of the G peak. In this study, the ratio of the fitted peak heights was utilized to reflect the peak intensity.…”

Section: Microstructure Analysismentioning

confidence: 99%

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Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Ma,

Wang,

et al. 2024

Applied Sciences

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Diamond-like carbon (DLC) has attracted much attention due to its unique properties such as high chemical inertness, optical transparency, and high biocompatibility. In this study, the total gas flow rate was kept constant, while the ratio of reactive gases was varied to deposit nitrogen-doped diamond-like carbon thin films on glass substrates using radiofrequency plasma-enhanced chemical vapor deposition. The effects of the gas flow ratio on the composition, microstructure, surface morphology, and optical properties of the thin films were investigated through extended deposition times. It was found that with an increase in the nitrogen-to-methane gas flow ratio, the film surface became smoother and more compact. The maximum transmittance in the visible range reached 90%, and the highest and lowest transmittance in the same ultraviolet wavelength region differed by up to 25.62% among several sample groups. The optical bandgap decreased from 3.58 eV to 3.46 eV, contrary to the trend of the sp2 fraction variation. Compared with other studies, this study considered the preparation of nitrogen-doped diamondoids using a chemical vapor deposition method with a lesser total gas flow rate passed into it, which provides practical data reference value for the preparation of N-DLC.

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Section: Microstructure Analysismentioning

confidence: 99%

“…In addition to metal doping, non-metals such as Si [13][14][15], F [16], and N [17] are also used to prepare different types of DLC films, which typically exhibit excellent mechanical [18], tribological [19], and chemical properties [1]. Hydrogenated DLC has poor thermal stability and optical properties due to the presence of CH bonds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Ma,

Wang,

et al. 2024

Applied Sciences

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“…However, too many carbolic grains in DLC reduces the coordination number of C atoms in the amorphous carbon matrix and leads to the increase in sp 2 bonds and decreases the hardness of coatings. Zhao et al [22] created Si-DLC coatings and found that as the Si content increases, the proportion of sp 3 /sp 2 improves. Then, the hardness and the degree of disorder are both increased in Si/N-DLC coatings due to the co-operation of Si and N. The high electronegativity of N has a trend to form C-N bond in Si/N-DLC coatings, which makes the uneven distribution of C-C bonds and leads to a decrease in the order of structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bias Voltages on the Tribological Behaviors of DLC Coatings

Zhang,

Huang,

Sun

et al. 2024

Coatings

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Ti/TiN/(Ti,N)-DLC/Ti-DLC/DLC coatings were deposited on 431 stainless steel using direct current magnetron sputtering technology under different bias voltages(0 V, −100 V, −200 V and −300 V). The microstructure and tribocorrosion performance of these DLC coatings in seawater was investigated. The results indicated that under the bias voltages, a denser and smoother surface of DLC coatings with a higher bonding strength between coatings and substrates was observed related to the increased incident kinetic energy of deposited ionized atoms. When the bias voltage was −200 V, the surface roughness reduced from 9.81 nm to 7.03 nm, and the bonding strength enhanced from 8.23 N to 8.86 N. What is more, the sp3 bond proportion and the disorder degree in DLC coatings both increased, which resulted in improved hardness and deformation resistance. However, when the bias voltage was −300 V, the increase of the amorphization was associated with a simultaneous rise in internal stress, which reduced the hardness and bond strength a little (8.72 N). DLC coatings can effectively improve the tribocorrosion properties of 431 stainless steel in seawater. When the voltage was −200 V, the average friction coefficient decreased from 0.35 to 0.07, with shallower wear traces and the wear loss of the DLC coating also being the smallest. The abrasive wear caused by metal oxides falling off the grinding ball, and the plastic deformation of the DLC coatings are the main wear forms. The high-density structure of DLC coatings under bias voltages can not only prevent the rapid expansion of cracks during deformation, but also provides a physical barrier to the erosion, which improves the corrosion and friction resistance in seawater. The optimization of bias voltage can improve the tribological performance of DLC coatings by regulating the carbon chain bond and microstructure. These results provide reference for DLC preparation and their potential engineering applications in stainless steel.

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“…Recently, many studies have revealed that incorporating silicon elements into DLC films can enhance their frictional characteristics in a water environment. − Some argued that the lower friction coefficient of Si-DLC films, in comparison to DLC films, can mainly be attributed to the colloidal silica produced due to chemical reactions initiated by friction at the sliding interface. − For instance, Oguri et al pointed out that the Si-DLC film exhibits superior low-friction properties when compared to the DLC film. This phenomenon is ascribed to the formation of a silicon sol at the friction interface.…”

Section: Introductionmentioning

confidence: 99%

What Determines the Low-Friction Mechanism of the Silicon-Doped Diamond-like Carbon Film in a Water Environment: An Atomic-Level Understanding

Liu,

Zhu

et al. 2024

Langmuir

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It is widely acknowledged that doping silicon can significantly enhance the friction performance of diamond-like carbon (DLC) films in a water environment. However, the mechanism of low friction caused by doped silicon is still highly controversial. Therefore, this article compares the interface interaction between DLC and Si-DLC films in a water environment through first-principles calculations of physisorption and chemisorption effects. The results indicate that water molecules are predominantly chemically adsorbed rather than physically adsorbed on the Si-DLC surface. Further study reveals that when OH-termination is formed on the Si-DLC surface, water molecules are predominantly physically adsorbed rather than chemically adsorbed on the Si-DLC hydroxylation surface. Consequently, a more stable hydration layer is formed on the surface through the hydrogen bond network formed by Si−OH groups, ultimately leading to lower friction. Moreover, molecular dynamics simulations further suggest that the lower friction coefficient of Si-DLC films in a water environment may be due to more water molecules at the friction interface and fewer interface covalent bonds. In short, the low-friction coefficient of the Si-DLC film in a water environment may be caused not only by the chemisorption of water molecules on its surface but also by the physisorption of water molecules on the Si-DLC film after surface hydroxylation.

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Structure and properties of Si and N co-doping on DLC film corrosion resistance

Cited by 15 publications

References 30 publications

Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Effects of Bias Voltages on the Tribological Behaviors of DLC Coatings

What Determines the Low-Friction Mechanism of the Silicon-Doped Diamond-like Carbon Film in a Water Environment: An Atomic-Level Understanding

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