Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A r
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Haji Hassan Masjuki,b) Mahendra Varman, and Muhammad Abul Kalam Center for Energy Sciences, Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Riaz Ahmad Mufti School of Mechanical and Manufacturing Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan
Nurin Wahidah Binti Mohd Zulkifli, Mubashir Gulzar, and Siti Safiyah Binti Nor Azman Center for Energy Sciences, Department of Mechanical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia (Received 30 November 2015; accepted 19 January 2016)
Tribological performance of industrial applications involving boundary lubrication regime can be improved by depositing surface coatings such as diamond-like carbon (DLC) on the interacting surfaces. DLCs are considered as hard coatings with unique combination of properties which results in minimizing the friction induced energy and material losses especially under starved lubrication conditions. In spite of high wear-resistance and ultralow friction coefficients, there are a lot of factors that can directly influence the tribological characteristics of DLC coatings. Although, many studies were conducted to comprehend the effects of intrinsic/extrinsic conditions on tribological behavior of these coatings, still there is a lack of understanding due to contradictory remarks. Therefore, there is a need to rearrange the published data in an organized manner for logical continuation of research. In this paper, a brief introduction of DLC coatings is presented followed by detailed discussion on conditions that can directly influence their tribological properties.
I. INTRODUCTION
In the last few decades, diamond-like carbon (DLC) coatings have attracted much attention of industries and research groups from all over the world (Fig. 1). This increase in demand can be attributed to outstanding physical, chemical, tribological, and optical properties of DLC coatings which make them suitable for a wide range of industrial applications especially those involving boundary lubricant regimes. Low coefficient of friction, high resistance against wear, increased hardness, and stability against environmental species are some of the distinguished characteristics of DLC coatings.2,3 Another benefit associated with the usage of DLC coatings is that they can be deposited on literally any material ranging from metals to ceramics, nonmetals, and metalloids.
Contributing Editor: Mohd Fadzli Bin Abdollah Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2016.31 J. Mater. Res., 2016
Tribological behavior of DLC coatings is strongly dependent on various intrinsic and extrinsic parameters. To select an optimum DLC coating for a particular application, there is a need to evaluate how various types of coatings perform in operating conditions replicating real life scenarios. A lot of experimental studies have been carried out by the tribologists to investigate the effects of intrinsic (hydrogen concentra
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