SCIENTIFIC RESEARCH AND DEVELOPMENT
PREPARATION AND PROPERTIES OF CORUNDUM HCBS
AND CERAMIC CONCRETES.
PART 1. MIXED HCBS IN THE SYSTEM ELECTROCORUNDUM —
VERY FINE QUARTZ GLASS
Yu. E. Pivinskii
and Pavel V. Dyakin
Translated from Novye Ogneupory, No. 1, pp. 22 – 30, January, 2010.
Original article submitted October 15, 2009.
A mixed highly concentrated suspension with improved rheological properties in the system corundum
(89%) – quartz glass (11%) is prepared by combined wet grinding. A semifinished product with a porosity up
to 17.5% with an ultimate strength in bending up to 5 MPa is prepared on the basis of it. The effect of heat
treatment temperature on material properties is studied. The HCBS composition obtained as a matrix system
combined with corundum or high-alumina fillers is promising for the preparation of ceramic concretes.
Keywords: highly concentrated ceramic binder suspension (HCBS), very fine quartz glass (VFQG), matrix
system, ceramic concrete, volume constancy, nanostabilization, nanoparticles.
The majority of molded and unmolded ceramic concretes
developed or produced within Russia relate to a group of alu-
minosilicate of high-alumina materials [1 – 11]. Most in de-
mand and used extensively in many enterprises are
refractories based on fired Chinese bauxite with an Al
content within the limits 87 – 90% [1 – 5]. The basis of their
technology is preparation of a HCBS of mixed composition
within a bauxite — very fine quartz glass (VFQG) system.
The VFQG content is 10 – 12%. The HCBS prepared by wet
combined grinding is a matrix (binder) system for producing
numerous molded and unmolded refractories using a granu
lar filler of bauxite, corundum, silicon carbide, or mixtures of
them. The following fact demonstrates the importance and
promising nature of producing these refractories. Whereas
output of refractories in Russia in 2009 compared with 2008
decreased by not less than a factor of 1.5, the production of
high-alumina ceramic concretes in OAO Pervoural Dinas
Plant, manufactured from a license of the Kerambet
Ogneupor firm, increased by 30% in the third quarter of 2009
compared with the similar pre-crisis quarter of 2008.
Recently the possibility has been considered of preparing
HCBS with similar production and binder properties using
electromelted corundum as the basic material. The second
component, VFQG, is introduced in an amount of 10 – 15%.
It has been assumed that use of HCBS of this mixed compo
sition, with an increased Al
content and a reduced
amount of admixtures typical for bauxite, will make it possi
ble to prepare materials with improved thermomechanical
property indices, compared with those of numerous molded
and unmolded refractories produced on a basis of bauxite
HCBS [1 – 5].
In previous studies [9, p. 250 – 254, 12, 13] the problem
was posed of preparing a binder suspension based on both
fired alumina and corundum, containing a glass phase (SrO,
, MgO, BaO). In these works, although significant
binder properties were achieved for suspensions (ultimate
strength in bending of a casting after drying 5 – 10 MPa),
their volume concentration C
was relatively low (0.40 – 0.52),
and castings prepared based on them had a porosity of
30 – 40%.
In  by means of wet grinding in ball mils a suspen
sion was obtained on the basis of electrocorundum. Taking
account of the data provided for the density of fired material
(3.30 – 3.55 g/cm
) with shrinkage up to 5%, it was possible
to suggest that in this case the parameters of suspensions
Refractories and Industrial Ceramics Vol. 51, No. 1, 2010
1083-4877/10/5101-0025 © 2010 Springer Science+Business Media, Inc.
OOO NVF Kerambet-Ogneupor, St Petersburg, Russia.
St Petersburg State Technological Institute (Technical Univer
sity), St Petersburg, Russia.