ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 8, pp. 1438!1440. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + B.M. Ginzburg, D.G. Tochil’nikov, A.K. Pugachev, V.M. Oichenko, Sh. Tuichiev, A.M. Leksovskii, 2007, published
in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 8, pp. 1400!1402.
Tribological Properties of Fluoroplastics Modified
with Fullerene Black in Sliding Friction
with Water Lubrication
B. M. Ginzburg, D. G. Tochil’nikov, A. K. Pugachev, V. M. Oichenko,
Sh. Tuichiev, and A. M. Leksovskii
Institute of Mechanical Engineering Problems, Russian Academy of Sciences, St. Petersburg, Russia
Plastpolimer Open Joint-Stock Company, St. Petersburg, Russia
Okhta Chemical Combine, St. Petersburg, Russia
Tadjik State National University, Dushanbe, Tadjikistan
Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, Russia
Received March 21, 2007
Abstract-Effect of fullerene black additives on the antifriction properties and wear resistance of F-4 and
F-4K20 fluoroplastics in sliding friction against steel with water lubrication was examined.
Polytetrafluoroethylene (PTFE) of F-4 brand [GOST
(State Standard) 10 007380, Russia] possesses good
antifriction properties and, at the same time, exhibits
enhanced wear and cold flow under load. This makes
is suitable as a structural material only under low
loads. The wear resistance of F-4 can be improved
by introduction of fillers [1, 2].
Most widely used materials based on F-4 fluoro-
plastic are the materials with various concentrations
of carbon powder fillers. For the support surfaces of
tribotechnical systems operating in water, the filler of
choice is coke. The most widely used composition,
F-4K20 , contains 80% F-4 and 20% coal coke.
This composition exhibits a high wear resistance,
low deformation under load, and low hygroscopicity.
The major drawback of F-4K20 is the rather high fric-
tion coefficient (233 times that of F-4). To improve
the wear resistance, the concentration of a carbon-
containing filler is occasionally raised to 40350%.
However, introduction of over 20% filler into F-4
sharply decreases the strength of the composite.
In this study, we prepared and examined a fairly
inexpensive antifriction polymeric material (APM)
combining the low friction coefficient of F-4 and
the high wear resistance of F-4K20.
We used fullerene black (FB) produced by the Neo-
Tek Research and Production Company, St. Peters-
burg ; it was introduced into F-4 in amounts of
1, 3, 5, or 10%. The fullerene black yielded by the ini-
tial extraction of fullerenes with toluene (FBE) was
introduced into F-4 and F-4K20 in an amount of 1%.
In all the cases, the soot introduction was in con-
forming with the technical specifications concerning
F-4K20 preparation .
The tribological tests were run on a 2070 SMT-1
standard roller friction machine by the previously
developed technique . The samples tested were
10-mm-thick flat plates with rectangular cross sections.
As a counterbody served a roller fabricated from
18Kh2N4MA steel [GOST (State Standard) 4543371],
rotating at 400 rpm, which corresponds to a sliding
velocity of 1 m s
. The circularly polished working
cylindrical surface of a roller with a width of 16 mm
had the roughness R
= 0.65 mm and was immersed
by 6 mm into a water bath during the tests.
On the sample surface, a wear groove with an area
of 30350 mm
was preliminarily formed, so that
the subsequent tests were made with conform coun-
terbodies with a run-in friction contact. Successively