HIGHLY CONCENTRATED CERAMIC BINDER SUSPENSIONS
BASED ON SILICON CARBIDE
V. A. Doroganov
and Yu. N. Trepalina
Translated from Novye Ogneupory, No. 8, pp. 50 – 52, August 2010.
Original article submitted October 1, 2009.
Highly concentrated ceramic binder suspensions (HCBS) based on silicon nitride are prepared and studied.
The main features of physicomechanical properties of specimens based on HCBS with heat treatment are es
tablished. The possibility is demonstrated of using HCBS as a binder in the production of refractory material
for various purposes.
Keywords: highly concentrated ceramic binder suspensions, silicon carbide, refractories.
Development and introduction of highly efficient materi-
als that operate reliably under extreme conditions is a prob-
lem of considerable importance whose solution will mainly
determine acceleration of the rate of scientific and technical
With combined action of high temperature, chemical and
corrosive media, erosion by solid particles and an electric
current, in many cases known metallic and ceramic materials
from which they are manufactured cannot provide structural
endurance. Among non-metallic refractory compounds, that
are the main broad class of materials with special physical
properties, a visible position is occupied by silicon carbide.
Obtained by Bercellius for the first time in 1824 over the
next hundred years silicon carbide was used extensively in
industry as the basis of certain abrasives, refractories and
electrical engineering materials. Industrial preparation of sil
icon carbide in an electric resistance furnace due to reaction
of silicon with carbon was assimilated in 1893. This method
has not been changed in principle up to the present time. In
nature silicon carbide is encountered extremely rarely. It was
detected for the first time a crater meteorite (Arizona, USA),
and it was subsequently named by Kuntz (in 1905)
moissonite. In addition, silicon carbide was detected in
kimberlites, olivines and volcanic breccias, and also in the
form of inclusions in crystals of natural diamond.
In view of its high mechanical strength and abrasiveness
over a wide temperature range SiC is used extensively in the
production of silicon carbide refractories [1, 2]. Silicon car
bide refractories have high physicomechanical properties and
endurance, high mechanical strength, resistance to deforma-
tion at high temperature, and as a result of the absence of
polymorphic transformations, it has a low linear thermal ex-
pansion coefficient (LTEC) and high thermal conductivity.
Silicon carbide refractories are mainly manufactured from
granular semidry or plastic mixes by compaction, ramming,
or stretching. In industry there is extensive use of silicon car-
bide based on silica, high-alumina, argillaceous and nitride
binders. Introduction of them changes the mix composition,
the structure of interphase and intergranular boundaries, and
correspondingly operates on finished object properties. A re
cent achievement in the field of silicon carbide refractories is
self-bonded and recrystallized silicon carbide. The direct
connection between SiC grains within them is achieved as a
result of crystallization at very high temperature in a reduc
ing atmosphere. The most effective silicon carbide materials
are distinguished by high physicomechanical and corrosion
property indices [3 – 9], obtained by activated or reaction
sintering, and hot compaction at temperatures up to 2100ºC.
A possible method for preparing silicon carbide materials is
technology based on the use of silicon carbide suspensions.
Studies for preparing these systems based on SiC and also a
study of the properties of finished objects were the concern
in the 1970s of I. S. Kainarskii and É. V. Degtyareva [10 – 12].
There is special interest in suspensions of silicon carbide pre
pared by special technology of highly concentrated ceramic
binder suspensions (HCBS), developed by Yu. E. Pivinskii
Use of HCBS based on silicon carbide makes it possible
to synthesize during their preparation highly reactive SiC
particles, that provide formation of the optimum intergranu
lar boundaries between grains, and sintering in this case may
Refractories and Industrial Ceramics Vol. 51, No. 4, 2010
1083-4877/10/5104-0302 © 2010 Springer Science+Business Media, Inc.
V. G. Shukhov Belgorod State Technological University, Belgo