STUDY OF PHYSICAL INTERACTION FORMATION
AT THE BOUNDARY OF CARBON MATRIX – CARBON FIBER
STRUCTURAL PHASES BY ELECTROPHYSICAL METHODS
IN CARBON-CARBON COMPOSITE MATERIALS
WITH A DIFFERENT DENSITY LEVEL
M. Yu. Bamborin,
V. A. Vorontsov,
and S. A. Kolesnikov
Translated from Novye Ogneupory, No. 2, pp. 22 – 28, February 2014.
Original article submitted August 13, 2013.
The change in specific electrical resistance in four-dimensional reinforced carbon-carbon composite materials
with a different density level, and also the effect of processing parameters on the physical interaction factor at
the carbon matrix–carbon fiber interface, are studied. Ranking of factors governing the level of material sur
face electrical resistance is established. Physicomechanical properties of carbon–carbon composites with a
different level of surface electrical resistance are determined.
Keywords: high-temperature treatment, carbon–carbon composites, composite strength, electrical resistance,
Carbon-carbon composite materials (CCCM) are a heter-
ogeneous structure and consist of fibers, matrix, and pores.
Structural transformations occurring in carbon material, de-
pending on temperature and time of isothermal exposure, are
reflected in changes in physical and chemical properties.
High-temperature treatment (HTT) of workpieces is an
integral part of carbon material technology and is the stage of
production processes for manufacturing carbon composites
by means of which not only thermal conductivity is con
trolled, but also the true density of carbon material, its elec
trical conductivity, and also oxidation rate and other mechan
ical and chemical property indices [1 – 5].
The aim of this work is to study physical reaction of a
carbon matrix and carbon fiber in material with a different
level of density by electrophysical methods.
The object studied was four-dimensional reinforced
composite based on carbon structural fiber made from
polyacrylonitryl (PAN) fiber grade UKN-5000 and carbon
matrix of coal-tar pitch coke. Carbonizing was performed in
furnaces under pressure. The fundamental production
scheme for CCCM manufacture has been described previ
ously [6, 7]. After the final number of impregnation cycles
and carbonization under pressure a workpiece was given
HTT at above 2200°C, sufficient for achieving true carbon
matrix substance density of £2.1 g/cm
. Then a workpiece
was given final HTT at a significantly lower temperature suf
ficient for completing carbonization
Determination of graphite crystal lattice parameters
Performance of x-ray phase analysis and also determina
tion of crystal dimensions and coherent scattering field,
interplanar distances in the structure of natural graphite and
test CCCM component, were carried out by the procedure
presented in .
Analysis of the “reflection intensity – beam incidence
angle” diagram in CCCM specimens revealed bimodal distri
bution. By comparison with calibration relationships for in
dividual composite components (carbon fiber, coal-tar pitch
coke) the corresponding peaks of the diagram were related to
its components. As a result of this in the present work the de
gree of difference of crystal condition of reinforcing filler of
a composite and its matrix was evaluated.
Refractories and Industrial Ceramics Vol. 55, No. 1, May, 2014
1083-4877/14/05501-0052 © 2014 Springer Science+Business Media New York
OAO NIIgrafit, Moscow, Russia.