STUDY OF HCBS PREPARATION
BASED ON MAGNESIUM ALUMINOSILICATE COMPOSITION GLASS
E. I. Suzdal’tsev,
T. V. Zaichuk,
Yu. S. Ustinova,
and S. N. Vandrai
Translated from Novye Ogneupory, No. 10, pp. 39 – 43, October 2015.
Original article submitted March 31, 2015.
The possibility is analyzed of preparing ceramic highly concentrated binder suspensions based on magnesium
aluminosilicate composition glass with dispersing additions, i.e., acryl copolymers. The main parameters and
rheology of prepared suspensions, and properties of green workpieces are considered. Comparative analysis is
provided for use of copolymers with different mean-mass (mean-weighted) molecular weight.
Keywords: ceramic highly concentrated binder suspensions, highly concentrated suspensions based on mag
nesium aluminosilicate glass, slip casting, acryl copolymers, properties, rheology.
Development of technology for materials based on ce-
ramic highly concentrated binder suspensions (HCBS) is of
considerable interest. Technology for preparing these materi-
als is a complex multistage process, whose basis is a combi-
nation of physical, mechanical, hydromechanical, and also
physicochemical and thermal actions. These actions are so
connected with each other that by changing the course of a
process in all of its stages it is possible to prepare materials
with different properties .
In the 1980s the main theoretical principles were formu
lated for preparing HCBS, including principles of optimum
dilution and the principle of rheotechnological conformity
The essence of method for preparing HCBS consists of
creating conditions for milling and stabilization of suspen
sions that could provide a required and sufficient degree of
HCBS thinning in order to realize energy-effective produc
tion regimes for preparing objects from these HCBS.
Currently a theoretical basis has been created for prepar
ing ceramic concretes based on HCBS and also low and
ultracement refractories. Both within Russia and overseas
significant experience has been accumulated for use of dif
ferent additives introduced to HCBS compositions with the
aim of controlling rheotechnological properties .
One index of suspension quality is aggregated stability,
i.e., retention of a degree of particle solid phase dispersion
unchanged with time . In order to achieve aggregated sta
bility certain additives are used in relation to the HCBS
group. Classification of HCBS is known in relation to the
chemical nature of solid phase: based on acid, acid-ampho-
teric, amphoteric, and basic materials.
Preparation of HCBS from basic materials, which con-
cerns objects of this research, i.e., magnesium aluminosili-
cate glass, is extremely difficult in view of the high activity
during reaction with a dispersion medium, i.e., water. As a
result of partial solubility of material components in water
there is an increase in content of chemically bonded liquid in
a suspension, reducing the volume fraction of solid phase.
An increase in the value of the proportion of bonded liquid
for basic materials leads to an increase in casting porosity,
and also significant weakening after heat treatment.
In order to stabilize a basic HCBS high molecular com
pounds are used, combining properties of classical wetting
and dispersing agents, for example polyacrylic acid copoly
mers. These are high molecular surfactants and dispersants
acting by a combined stabilization mechanism . The prin
ciple of stabilization using copolymers is based on forming a
three-dimensional network at the surface of particles. The
network is continuous, stably retained at an interface as mo
bile networks and groups, capable of reacting with each
other. Acryl additives have an electrostatic charge and at the
same time are modified by surface-active groups (Fig. 1).
For mineral suspensions (ceramic slips and clay suspen
sions) other additives are used; water glass, organic plastifier
SB-5, citric and oxalic acids, deflocculants type S-3, KOMP,
Castament FS-10 and FS-20, Dollaflux SP, Giss-fips,
Reotan, dispersing alumina grade ADS, ADW, etc. .
Refractories and Industrial Ceramics Vol. 56, No. 5, January, 2016
1083-4877/16/05605-0533 © 2016 Springer Science+Business Media New York
OAO ONPP Tekhnologiya, Obninsk, Kaluga Region, Russia.