Microtribological measurements of a hydrogenated diamondlike carbon film in controlled gaseous environments show that water vapor plays a significant role in the friction coefficient. These experiments reveal an initial high friction transient behavior that does not reoccur even after extended periods of exposure to low partial pressures of H2O and O2. Experiments varying both water vapor pressure and sample temperature show trends of a decreasing friction coefficient as a function of both the decreasing water vapor pressure and the increasing substrate temperature. Theses trends are examined with regard to first order gas-surface interactions. Model fits give activation energies on the order of 40 kJ/mol, which is consistent with water vapor desorption.

1.
Erdemir
,
A.
,
Eryilmaz
,
O. L.
,
Nilufer
,
I. B.
, and
Fenske
,
G. R.
, 2000, “
Synthesis of Superlow-Friction Carbon Films From Highly Hydrogenated Methane Plasmas
,”
Surf. Coat. Technol.
0257-8972,
133-134
, pp.
448
454
.
2.
Erdemir
,
A.
,
Eryilmaz
,
O. L.
,
Nilufer
,
I. B.
, and
Fenske
,
G. R.
, 2000, “
Effect of Source Gas Chemistry on Tribological Performance of Diamond-Like Carbon Films
,”
Diamond Relat. Mater.
0925-9635,
9
, pp.
632
637
.
3.
Erdemir
,
A.
, 2001, “
The Role of Hydrogen in Tribological Properties of Diamond-Like Carbon Films
,”
Surf. Coat. Technol.
0257-8972,
146-147
, pp.
292
297
.
4.
Casiraghi
,
C.
,
Piazza
,
F.
,
Ferrari
,
A. C.
,
Grambole
,
D.
, and
Robertson
,
J.
, 2005, “
Bonding in Hydrogenated Diamond-Like Carbon by Raman Spectroscopy
,”
Diamond Relat. Mater.
0925-9635,
14
, pp.
1098
1102
.
5.
Andersson
,
J.
,
Erck
,
R. A.
, and
Erdemir
,
A.
, 2003, “
Frictional Behavior of Diamondlike Carbon Films in Vacuum and Under Varying Water Vapor Pressure
,”
Surf. Coat. Technol.
0257-8972,
163–164
, pp.
535
540
.
6.
Heimberg
,
J. A.
,
Wahl
,
K. J.
,
Singer
,
I. L.
, and
Erdemir
,
A.
, 2001, “
Superlow Friction Behavior of Diamond-Like Carbon Coatings: Time and Speed Effects
,”
Appl. Phys. Lett.
0003-6951,
78
, pp.
2449
2451
.
7.
Andersson
,
J.
,
Erck
,
R. A.
, and
Erdemir
,
A.
, 2003, “
Friction of Diamond-Like Carbon Films in Different Atmospheres
,”
Wear
0043-1648,
254
, pp.
1070
1075
.
8.
Blanchet
,
T. A.
, and
Sawyer
,
W. G.
, 2001, “
Differential Application of Wear Models to Fractional Thin Films
,”
Wear
0043-1648,
251
, pp.
1003
1008
.
9.
Langmuir
,
I.
, 1916, “
The Constitution and Fundamental Properties of Solids and Liquids
,”
J. Am. Chem. Soc.
0002-7863,
38
, pp.
2221
2295
.
10.
Dickrell
,
P. L.
,
Sawyer
,
W. G.
, and
Erdemir
,
A.
, 2004, “
Fractional Coverage Model for the Adsorption and Removal of Gas Species and Application to Superlow Friction Diamond-Like Carbon
,”
ASME J. Tribol.
0742-4787,
126
, pp.
615
619
.
11.
Dickrell
,
P. L.
,
Sawyer
,
W. G.
,
Heimberg
,
J. A.
,
Singer
,
I. L.
,
Wahl
,
K. J.
, and
Erdemir
,
A.
, 2005, “
A Gas-Surface Interaction Model for Spatial and Time-Dependent Friction Coefficient in Reciprocating Contacts: Applications to Near-Frictionless Carbon
,”
ASME J. Tribol.
0742-4787,
127
, pp.
82
88
.
12.
Johnson
,
J. A.
,
Woodford
,
J. B.
,
Erdemir
,
A.
, and
Fenske
,
G. R.
, 2003, “
Near-Surface Characterization of Amorphous Carbon Films by Neutron Reflectivity
,”
Appl. Phys. Lett.
0003-6951,
83
, pp.
452
454
.
13.
Hudson
,
J. B.
, 1998,
Surface Science: An Introduction
,
Wiley
,
New York
.
14.
Adamson
,
A. W.
, and
Gast
,
A. P.
, 1997,
Physical Chemistry of Surfaces
,
6th ed.
,
Wiley
,
New York
.
15.
Biener
,
J.
,
Lang
,
E.
,
Lutterloh
,
C.
, and
Kuppers
,
J.
, 2002, “
Reactions of Gas-Phase H Atoms With Atomically and Molecularly Adsorbed Oxygen on Pt(111)
,”
J. Chem. Phys.
0021-9606,
116
, pp.
3063
3074
.
16.
O’Hanlon
,
J. F.
, 2003,
A User’s Guide to Vacuum Technology
,
3rd ed.
,
Wiley
,
New York
.
17.
Laikhtman
,
A.
,
Lafosse
,
A.
,
Le Coat
,
Y.
,
Azria
,
R.
, and
Hoffman
,
A.
, 2004, “
Interaction of Water Vapor With Bare and Hydrogenated Diamond Films Surfaces
,”
Surf. Sci.
0039-6028,
551
, pp.
99
105
.
You do not currently have access to this content.