STRUCTURAL FEATURES OF A CARBON PLASTIC MATERIAL
INFILTRATED WITH MOLTEN SILICON
A. P. Garshin,
V. A. Kurnukin,
V. I. Kulik,
and A. S. Nilov
Translated from Novye Ogneupory, No. 12, pp. 45 – 48, December, 2005.
Original article submitted August 22, 2005.
The structure of a SiC–C composite prepared from carbon plastic plates infiltrated with molten silicon and
hot-pressed organic bond composed of a ten-layer package of LU-24P unidirectional carbon tape is studied.
A technology for giving a fibrous structure to Si-impregnated carbon plastic plates in the SiC–C composite is
Components manufactured from SiC structural wear-re-
sistant materials by a technology developed at the ARIAG
(All-Russia Research Institute for Abrasives and Grinding,
St. Petersburg, Russia)  using recrystallization and reac-
tion sintering techniques have found widespread applications
in paper-making, textile, chemical and refractory sectors of
industry in Russia and republics of the former Soviet Union.
However, wider industrial use of such SiC components is
limited by their rather high brittleness which makes them
less suitable over a wide temperature range not only for SiC
ceramics, but also for all kinds of ceramic parts manufac
tured from high-melting compounds .
A method for removing this shortcoming has been pro
posed in [3, 4], the so-called “structural design” aimed at im
proving the resistance to brittle fracture of these materials.
For example, an effective means of enhancing the resistance
of ceramic matrix composites  is to reinforce them with
carbon fibers based on polyacrylonitrile (PAN) . We have
conducted tests on siliconized carbon fibers (Kulon, LU-24P
ribbon, UKN-5000P grade, VMN-4 (carbon filament) + PVS
(copper wire)) under a microscope (at ´100 magnification).
In siliconized specimens, silicon carbide pseudomorphosis
was observed to form on carbon fiber, where the carbon fiber
was partially converted to silicon carbide, with a clear ten
dency to retain the shape and geometric dimensions. Based
on the data obtained, carbon fiber materials (carbon plastics)
infiltrated with molten silicon were studied with a view to
wards preparing SiC materials and components reinforced
with carbon fibers.
The precursor specimens for silicon infiltration study
were carbon plastic plated with dimensions of 30 ´ 17 ´ 2mm
prepared by hot pressing of a package assembled from
10 layers (LU-24P carbon ribbon and epoxyphenol-novolac-
butyral (EPNB) binder) with a single-layer thickness of
0.2 mm. The volumetric ratio of components in the slopreg
(reinforcement:matrix) was about 60 : 40. The slopreg stack-
ing pattern was – 45° (1 layer)/0° (2 layers)/ ± 45° (1 layer);
the setting time at 180°Cwas6h.
The carbon plastic lamellar specimens were subjected to
infiltration with molten silicon (Kr1 grade) using an induc
Refractories and Industrial Ceramics Vol. 46, No. 6, 2005
1083-4877/05/4606-0419 © 2005 Springer Science+Business Media, Inc.
St. Petersburg State Polytechnical University, St. Petersburg,
Fig. 1. Photomicrograph of the cross section on intact carbon plas
tic specimens prepared from hot-pressed LU-24P carbon tape and
EPNB binder: carbon fibers (shown as filament-like and granular ar
eas); EPNB binder (shown dark), and pores (shown black); ´ 90.