Investigation on tensile behaviors of diamond-like carbon films

Bai, Lichun; Srikanth, Narasimalu; Wu, Hong; Liu, Yong; Liu, Bo; Zhou, Kun

doi:10.1016/j.jnoncrysol.2016.03.025

Cited by 40 publications

(16 citation statements)

References 58 publications

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“…The DLC films in the simulations are obtained by a melt-quenching procedure30. A block of crystalline diamond is firstly generated.…”

Section: Methodsmentioning

confidence: 99%

“…After a period of equilibration by keeping the block thermostatic, its temperature decreases to 300 K with a high rate of about 1000 K/ps which allows proper structural relaxations in amorphous structures. The dimension of the block is finally adjusted to release its residual stress in an isothermal-isobaric NPT ensemble at 300 K. More details of the melt-quenching procedure can refer to previous studies3031.…”

Section: Methodsmentioning

confidence: 99%

“…The hybridization states of C atoms are also evaluated by calculating the number of their nearest neighbor atoms within the cutoff of the maximum bond length. The fourfold, threefold and twofold atoms are regarded as sp 3 , sp 2 and sp bonded, respectively30. The temperature of atoms is calculated based on its relation with their kinetic energies39.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Third Particle on the Tribological Behaviors of Diamond-like Carbon Films

Bai

Srikanth

Kang

et al. 2016

Sci Rep

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Tribological mechanisms of diamond-like carbon (DLC) films in a sand-dust environment are commonly unclear due to the complicated three-body abrasion caused by sand particles. This study investigates the three-body abrasion of the DLC film via molecular dynamics simulations. The influence factors such as the load, velocity, shape of the particle and its size are considered. It has been found that the friction and wear of the DLC film are determined by adhesion at a small load but dominated by both adhesion and plowing at a large load. A high velocity can increase the friction of the DLC film but decrease its wear, due to the response of its networks to a high strain rate indicated by such velocity. The shape of the particle highly affects its movement mode and thus changes the friction and wear of the DLC film. It is found that a small-sized particle can increase the friction and wear of the DLC film by enhancing plowing. These unique tribological mechanisms of the DLC film can help to promote its wide applications in a sand-dust environment.

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“…The DLC films in the simulations are obtained by a melt-quenching procedure30. A block of crystalline diamond is firstly generated.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Third Particle on the Tribological Behaviors of Diamond-like Carbon Films

Bai

Srikanth

Kang

et al. 2016

Sci Rep

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“…In contrast to solid superlubricity of 2D nanomaterials, liquid superlubricity has only been achieved in carbon based films at present. DLC, which is a well‐known metastable type of amorphous carbon having a fraction of sp 3 bonding, has widespread tribological applications in the areas of magnetic storage devices, engine components, biocoating, as well as MEMS and NEMS …”

Section: D Nanomaterialsmentioning

confidence: 99%

Nanomaterials in Superlubricity

Zhai

Zhou

2019

Adv Funct Materials

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207

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The vanishing friction, known as superlubricity, is potentially a significant performance indicator in the development of nanostructured materials and has become increasingly important for realizing energy saving and extending the life of mechanical components. Herein, a systematic review of recent progress in nanomaterials for achieving the superlubric state is provided, beginning with a brief introduction of nanostructured materials in superlubricity and its wide potential applications. Subsequently, a detailed discussion of experimental and simulation works on the different spatial structures of nanomaterials associated with size effects ranging from 0D to 3D nanostructures is given, with an emphasis on solid and liquid superlubricity. Finally, this work concludes with perspectives on the challenges and future directions for developing nanomaterials in the field of superlubricity.

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“…Kunze et al (2014) reported that sp 3 -sp 2 transitions of the DLC films can also happen during their elastic deformation. It was later found that sp 3 atoms with sp 2 neighbors are the initiation sites for these sp 3 -sp 2 transitions (Bai et al, 2016b).…”

Section: Simulation Of Tribology At the Nanoscalementioning

confidence: 99%

Molecular dynamics study on tribological behaviors of DLC films

Bai¹

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Diamond-like carbon (DLC) films that are a type of amorphous solids exhibit excellent mechanical properties and superior tribological performances and thus can be used as the coating of workpieces to improve their wear resistance and reduce their surface friction. The tribological behaviors of the DLC films are sensitive to many factors such as the film compositions, operational parameters and environment. These sensitivities highly complicate the tribological mechanisms of the DLC films and largely degrade their reliability and performances. Due to the difficulty to observe the evolution of the contact interfaces, particularly their detailed atomic structures at the nanoscale, investigation of the tribological mechanisms of the DLC films is challenging. Molecular dynamics (MD) simulation is a powerful technique used to investigate the nanoscale physical and chemical phenomena which can hardly be observed in experiments. This PhD dissertation adopts MD simulation as the main approach to investigate the nanoscale tribological mechanisms of DLC films under different operational conditions. The effects of the load, velocity and the surface roughness of DLC films on their tribological behaviors are studied for two-body contact cases in which a diamond tip slides against a DLC film. It is found that the increase of the load can induce transition of wear from adhesive to abrasive and highly increase wear rate of the film. Its friction force follows the macroscale Bowden-Tabor model at a small load, but diverges from such model at a large load due to the formation of transfer layers. This keeps consistent with experimental observations in literature and thus demonstrates that the macroscale tribological mechanisms are still valid at the nanoscale. The friction force and wear rate of the film decrease with the velocity due to the reduction of the sliding depth of the diamond

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Investigation on tensile behaviors of diamond-like carbon films

Cited by 40 publications

References 58 publications

Influence of Third Particle on the Tribological Behaviors of Diamond-like Carbon Films

Influence of Third Particle on the Tribological Behaviors of Diamond-like Carbon Films

Nanomaterials in Superlubricity

Molecular dynamics study on tribological behaviors of DLC films

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