PROSPECTS FOR THE USE OF HEAT INSULATING MATERIALS
MANUFACTURED BY CERAMIC CONCRETE TECHNOLOGY
S. M. Mal’tsev
Translated from Novye Ogneupory,No.5pp.5–7,May2009.
Original article submitted February 11, 2009.
Prospects are demonstrated for the use of heat insulation materials, manufactured by concrete technology, in
various branches of industry. The materials are distinguished by thermal conductivity stability with a change
in temperature, and high thermal shock resistance.
Keywords: heat insulating materials, ceramic concretes, HCVS, thermal conductivity, thermal shock resis
tance, shaped blocks.
One of the priority areas for the refractory laboratory of
ZAO Soyuzteplostroi is development, testing and introduc-
tion of refractory materials prepared by ceramic concrete
technology. There has been considerable experience of using
dense materials in molten media (in magnesium electrolyzers
and chlorinators, in fluidized bed furnaces, etc). Manufacture
of ceramic concretes occupies two production areas of ZAO
Soyuzteplostroi: in Bereznikoe of the Perm region, and in
Lipetsk. It is planned to create two more areas in Angarsk
and St. Petersburg.
Currently there is intense work on creating medium-tem
perature heat insulating shaped blocks (900 – 1200°C); there
is a proposal for high-temperature objects. All of which as
sumes today either formation of objects of standard sizes or
shaped objects, manufactured by technology of low or me
dium cement concretes. Since in ZAO Soyuzteplostroi there
is a plant for producing expanded vermiculite, in order to
manufacture heat insulating objects as a binder a HCVS
(highly concentrated ceramic binder suspension) of alumino
silicate composition is used, and the filler is vermiculite.
In the laboratory, and then in production, a new method
for manufacturing objects has been proved and introduced.
Whereas previously after moulding and drying of materials
for providing the assembly strength of an object it was neces
sary to fire or strengthen it in an aqueous solution of water
glass (strengthening by chemical activation of contact bonds)
with additional drying, then currently a strong object is pre
pared after the first drying without additional introduction of
an addition into its composition. This makes it possible to
manufacture quite large objects with a thickness from
Testing fro thermal conductivity of the materials ob-
tained was carried out in the D. I. Mendeleev FGUP All-Rus-
sia Scientific Research Institute of Metrology. Specimens for
testing had an apparent density of 0.9 g/cm
, a temperature
on the hot side T
from 30 to 600°C. Results of tests are
Refractories and Industrial Ceramics Vol. 50, No. 3, 2009
1083-4877/09/5003-0160 © 2009 Springer Science+Business Media, Inc.
ZAO Soyuzteplostroi, St. Petersburg, Russia.
TABLE 1. Results of Testing Heat Insulation Materials with Addi
tion of Waste Ash
l, W/(m × K)
1 900 66.9 483.7 0.306
2 900 67.3 483.8 0.299
3 900 69.6 485.0 0.298
TABLE 2. Properties of High-Temperature Heat Insulation Objects
Prepared from HCVS
Objects with Al
Ultimate strength in compression after drying
at 150°C, MPa 15 25
Apparent density, g/cm
Thermal conductivity, W/(m × K)
Open porosity, % 26 18
Heat resistance (950°C – water) thermal shock >100
Linear shrinkage at 1300°C, % 0.05 0.01