A VERSATILE CARBON-CONTAINING REFRACTORY MATERIAL
WITH A CERAMIC BOND
I. G. Maryasev,
V. N. Koptelov,
L. D. Bocharov,
and N. Yu. Pavlova
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 2, pp. 32 – 36, February, 2002.
A technology for fabrication of corundum-based carbon-containing refractories with a ceramic bond has been
developed and put in service under industrial conditions at the Kombinat Magnezit JSC. The microstructure,
preparation technique, and mechanisms of wear are considered. The physical, ceramic, and thermal properties
of the newly developed material are discussed and compared to those of conventional refractory materials.
The unique and advantageous properties of this material are emphasized.
Extending the service life of thermal power units and,
specifically, refractory materials is a problem of major con-
cern in the metallurgy and refractory industries. In ferrous
and nonferrous metallurgy, one promising way toward devel-
opment of refractories, in particular, components for the lin-
ing of converters, ladles, or slide gates, involves the use of
carbon-containing composites modified with various addi-
tions (crystalline silicon, zirconia, etc.) to form ceramic car-
bide and nitride bonds for improving the thermomechanical
properties of refractory materials .
At the Kombinat Magnezit Joint-Stock Co., a technology
has been developed for manufacture of carbon-containing
refractories based on corundum and a ceramic bond. The ma
terial, by its chemical and mineral composition (State Stan
dard GOST 28874–90), has been assigned to a carbon-con
taining group, with a carbon concentration of 4 to 40% .
The granular filler used was fused or sintered corundum.
The chemical composition of the material components is
given in Table 1.
The technology for production of refractories is tradi-
tional; it involves five stages:
1. Preparing a mixture composed of jointly ground com-
ponents (variants are possible). Introducing various addi-
tions, with SAS (surface-active substances) incorporated into
the finely ground mixture component to ensure optimum
thermal and corrosion resistance of the refractories and to ex-
tend their service life .
2. Preparing, dosing, and mixing the starting materials.
3. Molding the preforms.
4. Drying in kilns at 220°C. The physical and ceramic
properties of the dried preforms are given in Table 2.
5. Calcining the dried preforms in a tunnel furnace at
1520°C using a coke pack.
The physical and ceramic characteristics of the newly de
veloped refractory (No. 1) are compared to those of other
refractories, namely, of periclase-carbon (No. 2), periclase
(No. 3), and periclase-spinel composition (No. 4) in Table 2.
The corresponding thermal coefficients of linear expansion
are given in Table 3.
Refractories and Industrial Ceramics Vol. 43, Nos.1–2, 2002
1083-4877/02/0102-0071$27.00 © 2002 Plenum Publishing Corporation
Kombinat Magnezit Joint-Stock Co., Satka, Chelyabinsk Region,
TABLE 1. Chemical Composition of the As-Prepared Refractory Specimens, wt.%
corundum-based 0.4 – 2.10 87.7 – 90.3 0.36 – 1.83 0.16 – 0.2 1.16 – 1.65 6.62 – 6.64 4.01 – 6.30 1.5 – 7.18 1.11 – 5.18
2 Periclase-carbon 94.3 0.63 2.03 1.20 1.61 12.0 12.7 – –
3 Periclase 97.3 0.06 0.61 1.21 0.48 – 0.19 – –
4 Periclase-spinel 85.4 8.69 2.04 2.01 1.72 – 0.16 – –