DEVELOPMENT AND STUDY OF COMPOSITE REFRACTORY MATERIALS
BASED ON MODIFIED DISPERSED SYSTEMS
1
V. A. Doroganov,
2
E. A. Doroganov,
2
N. S. Bel’maz,
2
K. V. Timoshenko,
2
Yu. N. Trepalina,
2
N. A. Peretokina,
2
I. I. Nemets,
2
A. S. Zuev,
2
and E. I. Evtushenko
2
Translated from Novye Ogneupory, No. 11 pp. 35 – 41, November 2009.
Original article submitted April 28, 2009.
Composite refractories and heat insulation materials of corundum, aluminosilicate and carbide ceramic com
-
positions with improved operating properties have been prepared by modifying dispersed binder materials at
different levels.
Keywords: highly-concentrated ceramic binder suspensions (HCBS), dispersed systems, nano-particles,
chamotte refractories, high-alumina refractories, quartz refractories, corundum, heat insulation materials, al
-
kaline slag binder, mechanochemical activation, thermal activation.
Currently a promising area for improving the properties
of refractories is the search for new technology for modify-
ing composite materials at the nano-level, in particular prep-
aration of binder components (matrix systems). In this re-
spect of greatest interest are binders that promote a reduction
in internal stress during material structure formation, and
also optimized processes that occur during final heat treat-
ment of finished objects.
The faculty of ceramic technology and design (TDKO)
of the V. G. Shukov Belgorod State Technological University
carried out research in the field of nanostructural modifica
-
tion of materials for various purposes both in the raw mate
-
rial treatment stage and also during formation of their struc
-
ture. One of the areas developed is technology for producing
ceramic heat insulation materials by a foam method using
modified alkali-slag binder. Various and quite contradictory
requirements are laid down for heat insulation materials: on
one hand they should reduce thermal conductivity, have low
density, and on the other hand they should exhibit structural
properties [1]. One of the promising inorganic chemical
binders is based on alkaline slag binders. In fact these bind
-
ers provide an increase in plastic strength for a fixed material
pore structure and the possibility of rapid striking of objects.
Here it is necessary to use within a composition alkaline slag
binders of slag with high activity [2]. As a result of pro
-
longed work the optimum composition of components has
been selected [3]. The general form and structure of the re-
fractory heat insulation materials obtained is presented in
Fig. 1. The materials obtained differ in structure with a uni-
form pore distribution throughout the whole volume with a
diameter of 0.1 – 1.5 mm depending on material density. In
physicomechanical properties the refractories correspond to
GOST 52803 “Heat insulation refractory objects. Technical
Conditions” (Table 1).
Currently in the TDKO faculty of the V. G. Shukov
BGTU there is a broad spectrum of work in preparing new
refractory materials for various purposes, including using
highly-concentrated ceramic binder suspensions (HCBS)
based on silica, aluminosilicate, magnesia, silicon carbide,
and other materials. In preparing these binders there is the
problem of providing maximum fluidity with a very high
volume concentration of solid phase C
V
[4]. In these materi
-
als in contrast to traditional binders based on clay, having s
thixotropic nature of flow, there is an increase in the dilation
effect [5]. Dilation in this case determines the nature for oc
-
currence of a number of production processes, in particular
compaction at high pressure. This effect may be reduced by
modifying the concentrated dispersed systems with natural
and technogenic organo-mineral additions [6 – 9].
Comparison of artificial dispersed systems and natural
systems (based on clay) for ceramic binders shows both their
similarity and a marked difference. The similarity consists of
the fact that development of binder properties is connected
with development within their composition of a certain
Refractories and Industrial Ceramics Vol. 50, No. 6, 2009
431
1083-4877/09/5006-0431 © 2009 Springer Science+Business Media, Inc.
1
Proc. International Conference of Refractory Workers and Metal
-
lurgists (Moscow 23 – 24 April, 2009).
2
V. G. Shukov Belogorod State technological University, Belgo
-
rod, Russia.
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