EFFECT OF DIFFERENT TYPES OF NANOSTRUCTURED ADDITIVES
AND MECHANICAL ACTION ON PITCH MATRIX PROPERTIES
FOR PRODUCING ARTIFICIAL GRAPHITE
A. V. Nasibulin,
N. A. Makarov,
A. A. Shvetsov,
N. V. Bardin,
N. Yu. Beilina,
and A. V. Petrov
Translated from Novye Ogneupory, No. 9, pp. 44 – 49, September, 2016.
Original article submitted May 31, 2016.
Modification of pitch matrix carbon nanomaterials improves sintering properties and strength of structural
graphites based upon it. An effect is revealed for the method of adding nanomaterials and additive concentra
tion on pitch and graphite properties.
Keywords: coal-tar pitch, pitch matrix, multilayer nanotubes (MNT), modification, artificial graphite.
Use of carbon nanomaterials (CNM), i.e., nanotubes,
nanofibers, as one of the components of matrix of structural
graphites withstanding high physicomechanical loads under
high-temperature conditions in a corrosive medium has been
studied. Recently a significant amount of experimental data
has been obtained pointing to the favorable effect of different
structure CNM materials on artificial graphite physico-
EFFECT OF ADDING DIFFERENT TYPES
OF CNM TO PITCH
In order to modify coal tar pitch carbon nanostructures
have been selected with high specific surface (nanotubes,
nanofibers, globular nanostructures). Addition of
nanostructures to pitch was accomplished by the following
method: pitch was ground to a fine faction (<300 mm) and
mixed with CNM additives in a ball mill for 1 h in sealed
containers. Then the mixture obtained was sealed in order to
prevent powder oxidation [1, 2].
Introduction of different nanoadditives. In this work
the concentration of carbon nanostructure additives in a pitch
matrix was varied from 0.1 to 1.5 wt.%. With this amount of
CNM content of different morphology improved properties
were obtained for coking capacity and sinterability of a pitch
mix compared with the original. Data are provided in Table 1
for coking capacity and sinterability of original pitch with
added nanostructures. Sinterability criterion DK was speci-
fied by the ratio of increase in yield of coke residue c.r. from
pitch in a mixture with a nanofiller to the yield of c.r. from
pitch without a filler. As is seen from Table 1, with an in
crease in nanostructured particles of different morphology
there is an increase in pitch coking capacity and its
sinterability with respect to the ratio of nanofiller of different
nature. A trend towards an increase in c.r. and DK is observed
independent of the type of additive.
With addition of WNT the sinterability increases by al
most a factor of two, and with introduction of MNT it in
creases by a factor of 30%. Undoubtedly, use of WNT gives
the best result, although their use is limited by cost, due to
the high degree of material uniformity. Multilayer nanotubes
contain a collection of various nanotubes, whereas sin
gle-layer nanotubes only contain one type.
A study of the effect of adding nanotubes on pitch prop
erties was conducted within concentration limits not above
1.5 wt.% based on the results obtained for final materials .
One of the important operating indices of CCM is ultimate
strength in compression. It has been shown by work carried
out previously that the best results are obtained within the
limits of additive concentration of 0.5 – 1.0 wt.%, and there
Refractories and Industrial Ceramics Vol. 57, No. 5, January, 2017
1083-4877/17/05705-0501 © 2017 Springer Science+Business Media New York
FGBOU VO D. I. Mendeleev Russian Chemical Technology Uni
versity, Moscow, Russia.
AO Research Institute of Structural Materials Based on Graphite
NIIgrafit, Moscow, Russia.