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: 2 of 22
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Fractional Coverage Model for the Adsorption and Removal of
Gas Species and Application to Superlow Friction Diamond-like
P. L. Frysz a, W. G. Sawyer a, A. Erdemir b
a University of Florida, Mechanical Engineering Department, Gainesville, FL 32611, USA
b Argonne National Laboratory, Energy Technology Division, Argonne, IL 60439, USA
The frictional behavior of diamond-like carbon (DLC) films varies with
environmental condition. One theory asserts that the cause of variations in the frictional
performance is environmental contaminants adsorbing onto the DLC film surface.
Testing of the frictional performance of DLC films in a pin-on-disk contact has mapped
the transient behavior of the friction coefficient. A model for fractional coverage, based
on the adsorption of environmental contaminants and their removal through the pin
contact, is developed. The rate of adsorption is taken from Langmuir's model , which
is combined with the removal rate from Blanchet and Sawyer . The coefficient of
friction is based on the average fractional coverage under the pin contact. The model also
gives a closed-form expression for the steady-state fractional coverage. Model
calculations compared favorably to the time progression of the friction coefficient for a
series of earlier experiments on a superlow friction DLC coating , when the fractional
removal term was allowed to increase with increasing sliding speed.
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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/m1/2/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.