STUDY OF MOLDING STRUCTURES AND PHYSICOMECHANICAL
PROPERTIES OF CARBON-CERAMIC COMPOSITE MATERIALS
OF THE SiC – C SYSTEM
S. A. Kolesnikov,
V. V. Konokotin,
and G. A. Kravetskii
Translated from Novye Ogneupory, No. 8, pp. 15 – 21, August 2009.
Original article submitted March 26, 2009.
The microstructure of composite materials of the composition SiC – C is analyzed. It is established that they
are a separate group of materials containing a ceramic matrix. The ceramic matrix experiences tensile stresses,
as a result of which within the composite material a traditional internal stress field is distorted. The ceramic
matrix increases strength at carbon phase boundaries of the composite material, and it reduces porosity. An ex
cess of ceramic material reduces strength and thermal stress resistance. Requirements are provided for poros
ity of the structure that govern the optimum field of material composition.
Keywords: carbon composite material, ceramic composite material, silicon carbide.
Carbon-ceramic composite materials (CCeCM) are re-
lated to refractory structural materials whose objects operate
at elevated temperature under conditions of high constant or
variable loads [1, 2]. Effective use of CCeCM objects under
these conditions is provided by their high strength, heat resis-
tance, high elasticity modulus and erosion resistance.
Pieces of a chemical reactor made from CCeCM with an
SiC matrix are shown in Fig. 1. The working temperature of
reactor operation is 1000°C, and the working gas is the prod
ucts of lucite pyrolysis, among which the most corrosive
components are chlorine, hydrogen chloride and arsenic
metal. A nose shield is shown in Fig. 2 for a pilotless orbital
craft, also manufactured in FGUP NIIgrafit. The working at
mosphere for shield operation is an ionized air plasma, and
the working temperature is up to 1570°C.
The general production scheme for preparing objects of
structural CCeCM includes the following main production
processes [3, 4]:
– formation of objects by working plastic mixes;
– carbonization of carbon-fiber-reinforced plastic and
forming a carbon matrix in the area of the primary polymer;
– filling of open porosity with carbon deposits by pyrol
ysis of gaseous hydrocarbons or polymer impregnators;
– formation of a ceramic (carbide) matrix within the vol
ume of the material;
– application of erosion-resistant sealing coatings.
Carbon reinforcing fibers determine the main strength
level and deformation properties of the material. The carbon
matrix achieves a rigid bond of threads and carbon filler, and
thereby provides the geometric parameters for large objects
both in the stage of high temperature production processes,
and also during operation. The open silicon carbide skeleton,
lowering the whole volume of the composite material, cre-
ates a barrier for interpore diffusion of oxidizing agent, and
Refractories and Industrial Ceramics Vol. 50, No. 4, 2009
1083-4877/09/5004-0276 © 2009 Springer Science+Business Media, Inc.
FGUP NIIgrafit, Moscow, Russia.
Fig. 1. Pieces of chemical reactor made of CCCM; largest flange
diameter 450 mm; piece height 640 mm .