Corrosion and tribological properties of ultra-thin DLC films with different nitrogen contents in magnetic recording media

Tan, A.H.

doi:10.1016/j.diamond.2006.08.033

Cited by 20 publications

(13 citation statements)

References 24 publications

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“…Mate used a sharp needle to deposit droplets of different types of polymer-based lubricants onto a carbon-coated substrate and found that spreading kinetics slowed down for lubricant by increasing the number of functional end groups. Moreover, degradation and the tribological properties of PFPE lubricants in the presence of DLC structures have been studied experimentally. − Zhao and Bhushan , used a mass spectrometer to investigate degradation of PFPE lubricants on magnetic media. Tan indicated that, by increasing the N 2 concentration in the DLC structure, the lubricant bonded ratio increases and the corrosion spot density decreases.…”

Section: Introductionmentioning

confidence: 99%

“…43−47 Zhao and Bhushan 43,44 used a mass spectrometer to investigate degradation of PFPE lubricants on magnetic media. Tan 45 indicated that, by increasing the N 2 concentration in the DLC structure, the lubricant bonded ratio increases and the corrosion spot density decreases. For deeper insight of the atomic bond structure and interaction of lubricant and DLC, MD simulation is very effective.…”

Section: Introductionmentioning

confidence: 99%

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A Reactive Force Field Study on the Interaction of Lubricant with Diamond-Like Carbon Structures

et al. 2016

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We studied the degradation of a perfluoropolyether lubricant, i.e., D4OH, in the presence of different components present in hard disks including diamond-like carbon (DLC), using ReaxFF reactive force field based molecular dynamics simulations. To generate the DLC structure, a carbon-diamond structure was melted in an Ar-filled head space box at 7500 K, and was slowly cooled down to 3000 K. Then, a constant pressure (NPT) simulation was performed to adjust the sample volume and reduce the internal stress. Similarly, for growth of functionalized DLC, ethylene molecules were used as the carbon source and they were pyrolyzed in the presence of Ar atoms to make Hfunctionalized DLC (DLC:H). This DLC:H structure was subsequently heated in the presence of nitrogen molecules to make H/N functionalized DLC (DLC:H:N). The results indicate that, by controlling number of Ar atoms and N 2 molecules, it is possible to achieve the experimental H/N/C composition and sp 2 /sp 3 ratio composition targets. Final DLC and DLC:H:N structures have an sp 3 :sp 2 ratio of 27.3, and 31.7%, respectively. Hydrogen and nitrogen contents of 17.9 and 13.7%, respectively, were obtained. After preparing the DLC structures, the spreading mechanism of lubricant droplet containing 9 D4OH strands was investigated over DLC and DLC:H:N structures. It was found that the speed of lubricant spreading over the nonfunctional structure (DLC) is higher than that for the functional structure (DLC:H:N). Moreover, our results indicated that the presence of both DLC and DLC:H:N affects the degradation chemistry of the lubricant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Reactive Force Field Study on the Interaction of Lubricant with Diamond-Like Carbon Structures

et al. 2016

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“…In general, the main causes of lubricant degradation can be categorized as thermal decomposition, catalytic decomposition, mechanical degradation by a shearing process, and electron-mediated degradation. − Experimental studies on the degradation of PFPE lubricants in the presence of different components have been described in several papers. For instance, the degradation and tribological properties of PFPE lubricants in the presence of diamond-like carbon (DLC) structures have been studied experimentally. − Zhao and Bhushan , used a mass spectrometer to investigate the degradation of PFPE lubricants on the magnetic media. They found that the C–O bond is a weak bond in the lubricant and because of its polar characteristics it can be easily attacked and broken.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Perfluoropolyether Lubricant Degradation in the Presence of Oxygen, Water, and Oxide Nanoparticles using a ReaxFF Reactive Force Field

2018

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The degradation of a perfluoropolyether lubricant, i.e., D4OH, was studied in the presence of a number of different components in a computer hard disk drive using ReaxFF reactive force field-based molecular dynamics simulations. The chemical reaction between nine D4OH strands with oxygen, water, oxide nanoparticles including SiO 2 , goethite (FeO(OH)), and Fe 2 O 3 was simulated by using reactive molecular dynamics simulation at T = 1500 K. All oxide nanoparticles were used in three different configurations:(1) untreated − cut from the crystalline structure without further treatment; (2) pretreated with dry air; and (3) pretreated with wet air to simulate a realistic environment. It was observed that water molecules strongly affect the degradation rate of the D4OH lubricant while oxygen molecules do not play a significant role. Moreover, the results indicated that the presence of these nanoparticles in any form accelerates the lubricant degradation. Untreated silica and Goethite nanoparticles have stronger effects on the degradation rates of lubricant strands in comparison to dry-air-treated and wet-airtreated nanoparticles, while in the case of Fe 2 O 3 nanoparticles wet-air-treated nanoparticles have the strongest effect on the degradation rates of lubricant strands.

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“…scratching) off some material 19 or by imprinting nanoscale features on a layer of a photoresist with a sharp tip. 20,21 Recently, several research groups have reported their investigations of ultrathin DLC lms fabricated by ion beam deposition, 22 electron cyclotron resonance chemical vapour deposition (ECR-CVD) 23 and Filtered Cathodic Vacuum Arc (FCVA) discharge 23,24 techniques. These studies showed that DLC lms can be used as a protective coating for a new generation of high-density magnetic memory disks.…”

Section: Introductionmentioning

confidence: 99%

Magnetically enhanced plasma coating of nanostructures with ultrathin diamond-like carbon films

et al. 2014

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Corrosion and tribological properties of ultra-thin DLC films with different nitrogen contents in magnetic recording media

Cited by 20 publications

References 24 publications

A Reactive Force Field Study on the Interaction of Lubricant with Diamond-Like Carbon Structures

A Reactive Force Field Study on the Interaction of Lubricant with Diamond-Like Carbon Structures

Molecular Dynamics Simulations of Perfluoropolyether Lubricant Degradation in the Presence of Oxygen, Water, and Oxide Nanoparticles using a ReaxFF Reactive Force Field

Magnetically enhanced plasma coating of nanostructures with ultrathin diamond-like carbon films

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