Scuffing experiments were conducted using 76mm diameter disks both with and without a metal-containing, carbon-based hard coating. The operating conditions in the experiments were severe with sliding speeds up to 16ms and maximum Hertzian contact pressures up to 2.0GPa. The disks were of alloy steel, which was case carburized and hardened followed by axial grinding. Four different surface conditions were investigated as follows: ground/uncoated, ground/coated, superfinished/uncoated, and superfinished/coated. Experiments were also carried out in which ground/coated disks were run against ground/uncoated disks. The results of the experiments show that the addition of the hard coating to the ground disks significantly improved both their scuffing resistance and frictional behavior, but the coating was less effective in producing an improvement in the durability and friction of the superfinished disks.

1.
Organisation for Economic Cooperation and Development (OECD), 1969,
Glossary of Terms and Definitions in the Field of Friction, Wear and Lubrication
,
OECD
, Paris, pp.
52
53
.
2.
Teeter
,
F. J.
, and
Berger
,
M.
, 1996, “
Wear Protection for Gears
,”
Gear Technol.
0743-6858,
13
(
2
), pp.
27
29
.
3.
Stott
,
W. R.
, 1999, “
Myths and Miracles of Gear Coatings
,”
Gear Technol.
0743-6858,
16
(
4
), pp.
35
44
.
4.
Joachim
,
F.
,
Kurz
,
N.
, and
Glattharr
,
B.
, 2002, “
Influence of Coatings and Surface Improvements on the Lifetime of Gears
,” VDI-Berichte NR. 1665, pp.
565
582
.
5.
Donnet
,
C.
, 1998, “
Recent Progress on the Tribology of Doped Diamond-Like and Carbon Alloy Coatings: A review
,”
Surf. Coat. Technol.
0257-8972,
100–101
, pp.
180
186
.
6.
Grill
,
A.
, 1997, “
Tribology of Diamondlike Carbon and Related Materials: An Updated Review
,”
Surf. Coat. Technol.
0257-8972,
94–95
, pp.
507
513
.
7.
Grill
,
A.
, 1999, “
Diamond-Like Carbon: State of the Art
,”
Diamond Relat. Mater.
0925-9635,
8
, pp.
428
434
.
8.
Naik
,
S. K.
,
Manesh
,
A.
,
Mallet
,
E.
, and
Swiglo
,
A.
, 2000, “
Surface Reaction Layers and Deposition (Enhanced Protection of Gears)
,”
Presentation at the Illinois Institute of Technology
, Chicago, Jun. 13.
9.
Alanou
,
M. P.
,
Evans
,
H. P.
,
Snidle
,
R. W.
, and
Krantz
,
T. L.
, 2002, “
On the Performance of Thin Hard Coatings for Gearing Applications
,”
Tribol. Trans.
1040-2004,
45
(
3
), pp.
334
344
.
10.
Amaro
,
R. I.
,
Martins
,
R. C.
,
Seabra
,
J. O.
,
Yang
,
S.
,
Teer
,
D. G.
, and
Renevier
,
N. M.
, 2005, “
Carbon/Chromium Low Friction Surface Coating for Gears Application
,”
Ind. Lubr. Tribol.
0036-8792,
57
(
6
), pp.
233
242
.
11.
Krantz
,
T.
,
Cooper
,
C.
,
Townsend
,
D.
, and
Hansen
,
B.
, 2004, “
Increased Surface fatigue Lives of Spur Gears by Application of a Coating
,”
ASME J. Tribol.
0742-4787,
124
(
4
), pp.
709
716
.
12.
Patching
,
M. J.
,
Kweh
,
C. C.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
, 1995, “
Conditions for Scuffing Failure of Ground and Superfinished Steel Discs at High Sliding Speeds Using a Gas Turbine Engine Oil
,”
ASME J. Tribol.
0742-4787,
117
, pp.
482
489
.
13.
Bewilogua
,
K.
,
Cooper
,
C. V.
,
Specht
,
C.
,
Schröder
,
J.
,
Wittorf
,
R.
, and
Grischke
,
M.
, 2000, “
Effect of Target Material on Deposition and Properties of Metal-Containing DLC (Me-DLC) Coatings
,”
Surf. Coat. Technol.
0257-8972,
127
, pp.
223
231
.
14.
Mercer
,
C.
,
Evans
,
A. G.
,
Yao
,
N.
,
Allameh
,
S.
, and
Cooper
,
C. V.
, 2003, “
Material Removal on Lubricated Steel Gears With W-DLC-Coated Surfaces
,”
Surf. Coat. Technol.
0257-8972,
173
, pp.
122
129
.
15.
Wang
,
J. S.
,
Sugimura
,
Y.
,
Evans
,
A. G.
, and
Tredway
,
W. K.
, 1998, “
The Mechanical Performance of DLC Films on Steel Substrates
,”
Thin Solid Films
0040-6090,
325
, pp.
163
174
.
16.
Cho
,
S.
,
Lee
,
K.
,
Eun
,
K. Y.
,
Hahn
,
J. H.
, and
Ko
,
D.
, 1999, “
Determination of Elastic Modulus and Poisson’s Ratio of Diamond-Like Carbon Films
,”
Thin Solid Films
0040-6090,
341
, pp.
207
210
.
17.
Cooper
,
C. V.
,
Beetz
,
C. P.
, Jr.
,
Buchholtz
,
B. W.
,
Wilbur
,
P. J.
, and
Wei
,
R.
, 1994, “
Spectroscopic and Selected Mechanical Properties of Diamond-Like Carbon Films Synthesized by Broad-Beam Ion Deposition From Methane
,”
Diamond Relat. Mater.
0925-9635,
3
, pp.
534
541
.
18.
Cooper
,
C. V.
,
Holiday
,
P.
, and
Matthews
,
A.
, 1994, “
The effect of TiN Interlayers on the Indentation Behavior of Diamond-Like Carbon Films on Alloy and Compound Substrates
,”
Surf. Coat. Technol.
0257-8972,
63
(
3
), pp.
129
134
.
19.
Wang
,
R.
,
Mercer
,
C.
,
Evans
,
A. G.
,
Cooper
,
C. V.
, and
Yoon
,
H. K.
, 2002, “
Delamination and Spalling of Diamond-Like-Carbon Tribological Surfaces
,”
Diamond Relat. Mater.
0925-9635,
11
, pp.
1797
1803
.
20.
Jiang
,
J. C.
,
Meng
,
W. J.
,
Evans
,
A. G.
, and
Cooper
,
C. V.
, 2003, “
Structure and Mechanics of W-DLC Coated Spur Gears
,”
Surf. Coat. Technol.
0257-8972,
176
, pp.
50
56
.
21.
Chittenden
,
R. J.
,
Dowson
,
D.
,
Dunn
,
J. F.
, and
Taylor
,
C. M.
, 1985, “
A Theoretical Analysis of the Isothermal Elastohydrodynamic Lubrication of Concentrated Contacts
,”
Proc. R. Soc. London, Ser. A
1364-5021,
397
, pp.
245
269
,
Chittenden
,
R. J.
,
Dowson
,
D.
,
Dunn
,
J. F.
, and
Taylor
,
C. M.
, 1985, “
A Theoretical Analysis of the Isothermal Elastohydrodynamic Lubrication of Concentrated Contacts
,”
Proc. R. Soc. London, Ser. A
1364-5021,
397
, pp.
245
269
, 271–294.
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