A time dependent fractional coverage model for the adsorption and removal of gas species and application to the friction behavior of superlow friction DLC. Page: 3 of 22
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The unique properties of diamond-like carbon (DLC) films are characterized by
excellent wear resistance, biocompatibility, and chemical inertness. These films can
potentially be used in a wide range of applications, such as bearings, cutting tools,
submersible parts, and biomedical applications [4-7]. Testing of DLC films as solid
lubricant coatings has shown them to possess low coefficients of friction, spanning the
range =0.001 to 0.6 [6-9], although the testing conditions and type of DLC film (i.e.,
hydrogenated vs. hydrogen-free) have a strong influence on its frictional behavior. The
frictional behavior of the superlow friction DLC film, recently investigated at Argonne
National Laboratory [3,7], has been theorized to be dependent on the amount of
contaminants adsorbed on the rubbing surface .
Some attempts have been made to model the frictional behavior of DLC and other
carbon films in various environments [6,10,11]. A current hypothesis is that the
variations in friction coefficient with sliding speed in a pin-on-disk contact are the result
of a competitive rate process that involves both the adsorption of a contaminant species
on the surface of the diamond-like carbon and the removal of these species under the
contact of the pin. Much like vapor-phase lubrication [12-18], such processes have a
strong dependence on the gas pressures of the contaminants, available areas for
adsorption, time exposed to the environment, and temperature. This paper outlines the
development of a closed-form, time-dependent model for such competitive processes
using, principally, the works of Langmuir  and Blanchet and others [2,12-18]. Such a
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Frysz, P. L.; Sawyer, W. G. & Erdemir, A. A time dependent fractional coverage model for the adsorption and removal of gas species and application to the friction behavior of superlow friction DLC., article, March 12, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc742661/m1/3/?rotate=270: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.