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Leslie A Pruitt - One of the best experts on this subject based on the ideXlab platform.

  • Diamond-Like Carbon coatings for orthopaedic applications: an evaluation of tribological performance.
    Journal of Materials Science: Materials in Medicine, 1999
    Co-Authors: T Xu, Leslie A Pruitt
    Abstract:

    A detailed investigation of the tribological behaviour of vacuum arc Diamond-Like Carbon coated Ti–6Al–4V against a medical grade ultra-high molecular weight polyethylene is conducted in this work in order to investigate the potential use of Diamond-Like Carbon coatings for orthopaedic appplications. Lubricated and non-lubricated wear experiments are performed using a standard pin-on-disc wear tester. The coefficient of friction is monitored continuously during testing and wear rate calculations are performed using surface profilometry measurements of worn disc surfaces. Sliding wear tests show the existence of two distinct friction and wear regimes distinguished by physically different mechanisms. In the first stages of wear, adhesion and abrasion are the dominant mechanisms of wear while fatigue processes are activated later in the tests. The effects of Diamond-Like Carbon coating structure, surface roughness and lubrication on tribological behaviour are presented. Optimal process–structure–property design for vacuum arc plasma deposition is utilized in order to obtain strong adhesion to the titanium alloy substrate. Diamond-Like Carbon coatings significantly improve the friction and wear performance of the orthopaedic bearing pair and show exceptional promise for biomedical applications. © 1999 Kluwer Academic Publishers

  • Diamond-Like Carbon coatings for orthopaedic applications: an evaluation of tribological performance.
    Journal of materials science. Materials in medicine, 1999
    Co-Authors: Leslie A Pruitt
    Abstract:

    A detailed investigation of the tribological behaviour of vacuum arc Diamond-Like Carbon coated Ti-6Al-4V against a medical grade ultra-high molecular weight polyethylene is conducted in this work in order to investigate the potential use of Diamond-Like Carbon coatings for orthopaedic appplications. Lubricated and non-lubricated wear experiments are performed using a standard pin-on-disc wear tester. The coefficient of friction is monitored continuously during testing and wear rate calculations are performed using surface profilometry measurements of worn disc surfaces. Sliding wear tests show the existence of two distinct friction and wear regimes distinguished by physically different mechanisms. In the first stages of wear, adhesion and abrasion are the dominant mechanisms of wear while fatigue processes are activated later in the tests. The effects of Diamond-Like Carbon coating structure, surface roughness and lubrication on tribological behaviour are presented. Optimal process-structure-property design for vacuum arc plasma deposition is utilized in order to obtain strong adhesion to the titanium alloy substrate. Diamond-Like Carbon coatings significantly improve the friction and wear performance of the orthopaedic bearing pair and show exceptional promise for biomedical applications.

John Robertson - One of the best experts on this subject based on the ideXlab platform.

  • Diamond-Like Carbon.
    ChemInform, 2010
    Co-Authors: John Robertson
    Abstract:

    Diamond-Like Carbon (DLC) is a dense, partially sp3 bonded form of amorphous Carbon prepared by ion beam or plasma deposition and frequently used as a hard coating material. Its sp3 bonding arises from C+ ions penetrating surface layers and giving a quenched-in density increase. The formation of DLC can be viewed as a phase transition to a denser metastable phase. The atomic structure of DLC consists of a network of sp3 and sp2 sites. The ?r states of sp2 sites control the electronic properties and the connectivity of sp' sites controls the mechanical properties.

  • Photoconductivity and recombination in Diamond-Like Carbon
    Carbon, 1999
    Co-Authors: Adrian Ilie, B. Kleinsorge, John Robertson, Neil Conway, William I. Milne
    Abstract:

    The steady-state photoconductivity of tetrahedral amorphous Carbon (ta-C) and hydrogenated ta-C (ta-C:H) has been studied as a function of temperature, light intensity, and photon energy, in order to understand the recombination process in Diamond-Like Carbon. It is found that the levels demarking the recombination states can span only part of the gap, so that the recombination centres can vary from every defect, to some defects, to some tail states, according to conditions.

  • Properties of Diamond-Like Carbon for Thin Film Microcathodes for Field Emission Displays
    MRS Proceedings, 1996
    Co-Authors: John Robertson, William I. Milne
    Abstract:

    Diamond-Like Carbon is a strong candidate for field emission microcathodes for field emission displays because of its low electron affinity and chemical inertness. The field emission properties of various types of Diamond-Like Carbon such as a-C:H and ta-C are reviewed in the framework of a bonding model of their affinity.

  • Deposition of Diamond-Like Carbon
    Philosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences, 1993
    Co-Authors: John Robertson
    Abstract:

    Diamond-Like Carbon refers to forms of amorphous Carbon and hydrogenated amorphous Carbon containing a sizeable fraction of sp$^{3}$ bonding, which makes them mechanically hard, infrared transparent and chemically inert. This paper discusses the various thin film deposition processes used to form Diamond-Like Carbon and the deposition mechanisms responsible for promoting the metastable sp$^{3}$ bonding.

  • Properties of Diamond-Like Carbon
    Surface and Coatings Technology, 1992
    Co-Authors: John Robertson
    Abstract:

    This paper revies the preparation and properties of hard forms of amorphous Carbon and hydrogenated amorphous Carbon, often known as Diamond-Like Carbon. Properties such as the hydrogen content, sp3 content, optical gap, refractive index, hardness, elastic modulus and friction and their dependence on the deposition conditions are described. Models of the electronic structure and mechanical properties are used to relate the physical properties to the atomic structure.

Yong Cheng - One of the best experts on this subject based on the ideXlab platform.

  • A review on Diamond-Like Carbon films grown by pulsed laser deposition
    Applied Surface Science, 2021
    Co-Authors: Guojun Huang, Sai Wang, Shangfang Wei, Fangtao Tian, Li Wei, Haiyuan Cao, Yong Cheng
    Abstract:

    Abstract Pulsed laser deposition is an excellent technology for growing Diamond-Like Carbon films. It can provide sufficient ion energy at a low temperature to achieve the desired compound or doped coating during the deposition process. This review discusses the influence of the dominant laser parameters, ambient gas, and substrate-target conditions on the various properties of Diamond-Like Carbon films by arranging the data reported in the last decade. Details of the basic and advanced pulsed laser deposition processes used to grow Diamond-Like Carbon coatings are reviewed, and the highly adhesive Diamond-Like Carbon film deposited by advanced pulsed laser deposition is emphasized. The excellent protective performance of Diamond-Like Carbon films prepared by pulsed laser deposition is attributed to their high hardness, chemical inertness, low friction, and superior wear resistance, leading to applications in the fields of tribology, mechanics, medicine, and optics. Double laser beam deposition, hybrid pulsed laser deposition, and ion management in a magnetic field, which represent the development of pulsed laser deposition, are also discussed. This review is expected to offer assistance and inspiration to researchers engaged in the growth of Diamond-Like Carbon films.

Bharat Bhushan - One of the best experts on this subject based on the ideXlab platform.

Guojun Huang - One of the best experts on this subject based on the ideXlab platform.

  • A review on Diamond-Like Carbon films grown by pulsed laser deposition
    Applied Surface Science, 2021
    Co-Authors: Guojun Huang, Sai Wang, Shangfang Wei, Fangtao Tian, Li Wei, Haiyuan Cao, Yong Cheng
    Abstract:

    Abstract Pulsed laser deposition is an excellent technology for growing Diamond-Like Carbon films. It can provide sufficient ion energy at a low temperature to achieve the desired compound or doped coating during the deposition process. This review discusses the influence of the dominant laser parameters, ambient gas, and substrate-target conditions on the various properties of Diamond-Like Carbon films by arranging the data reported in the last decade. Details of the basic and advanced pulsed laser deposition processes used to grow Diamond-Like Carbon coatings are reviewed, and the highly adhesive Diamond-Like Carbon film deposited by advanced pulsed laser deposition is emphasized. The excellent protective performance of Diamond-Like Carbon films prepared by pulsed laser deposition is attributed to their high hardness, chemical inertness, low friction, and superior wear resistance, leading to applications in the fields of tribology, mechanics, medicine, and optics. Double laser beam deposition, hybrid pulsed laser deposition, and ion management in a magnetic field, which represent the development of pulsed laser deposition, are also discussed. This review is expected to offer assistance and inspiration to researchers engaged in the growth of Diamond-Like Carbon films.

  • OPTICAL PROPERTIES OF THE RAPID ANNEALED OXYGEN-DOPED Diamond-Like Carbon FILM
    Surface Review and Letters, 2017
    Co-Authors: Guojun Huang, Yanlong Guo, Shuyun Wang
    Abstract:

    The amorphous oxygen-doped Diamond-Like Carbon films were prepared by pulsed laser deposition. Compared with the pure Diamond-Like Carbon film, there were much less graphite clusters on the surfaces of the oxygen-doped Diamond-Like Carbon films, and the average transmission of the oxygen-doped Diamond-Like Carbon films in the medium infrared band increased. However, some new absorption peaks in the infrared spectra of the oxygen-doped Diamond-Like Carbon film were generated. Rapid annealing was experimented to remove the absorption peaks. XPS analysis showed that the fractions of the C–O and C=O bonds that generated the new absorption peaks were reduced more than the fractions of sp3 bonds by rapid annealing at 400∘C, and the absorption peaks in the medium infrared spectra decreased. It indicated that rapid annealing at right temperature during the right time could reduce greatly the absorption in the medium infrared band of oxygen-doped Diamond-Like Carbon films.