REFRACTORY PLASTIC MASSES BASED ON HIGHLY CONCENTRATED
CERAMIC BINDING SUSPENSIONS (HCBS).
II. STRUCTURAL AND MECHANICAL PROPERTIES
OF PLASTICIZED HCBS IN THE SYSTEM SiO
V. A. Doroganov,
Yu. E. Pivinskii,
and E. A. Doroganov
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 3, pp. 17 – 21, March, 2001.
Rheological properties of individual suspensions of quartz sand, quartz glass, and Nizhne-Uvel’skoe (NU)
clay and compound suspensions of these components containing 20 – 80 % NU clay are studied. The effect of
NU content on rheological properties of the compound suspensions is considered. Structural and mechanical
properties of plastic masses (with a moisture content of 10 – 20%) based on compound suspensions using a
Tolstoi plastometer are studied. The data obtained are used to determine the main elastoplastoviscous and
structural-mechanical properties of the plastic masses. The effect of the added HCBS on the rheological char-
acteristics is considered.
In the previous work , production of refractory plas-
tics in the overall production balance of refractory materials
has been considered. Trends in the development of refractory
plastics have been discussed and manufacturing faults
pointed out, such as high porosity (23 – 30%), low strength
after heat treatment (4 – 16 MPa), and high linear shrinkage
(1.0 – 1.4%). The suggestion has been made  that highly
concentrated ceramic binding suspensions (HCBS) can pro
fitably be used in the manufacture of refractory plastics with
In , properties of clay suspensions were studied; in
this work, we report on multicomponent binders, composed
of nonplastic HCBS plasticized with refractory clay. Earlier
[2, 3], the rheological properties of systems composed of
HCBS and refractory clay in the yield state were studied in
detail. In the present study, we are concerned with exploring
the rheological properties of similar systems with a plastic
(“solid-like”) consistency . A plastometer designed by
D. M. Tolstoi  was used to study the rheological properties
of the plastic mass.
Rheological properties of individual and compound
suspensions. Knowledge of the rheological behavior offers a
means of actively controlling the final structure and proper
ties of the material by varying the composition, introducing
appropriate additions, and setting optimum parameters of the
In the rheological study, suspensions of quartz sand and
quartz glass of different grain composition and clay of prove-
nance from the Nizhne-Uvel’skoe deposit were used; rele-
vant characteristics are given in Table 1.
Rheological properties of compound suspensions of
HCBS and Nizhne-Uvel’skoe (NU) clay of different compo
sition are graphically presented in Figs. 1 and 2. It was sug
gested earlier [6 – 8] that combining HCBS and refractory
clay might be a promising way toward obtaining materials
with improved properties. The curves in Figs. 1 and 2 show
that the suspensions of quartz sand and glass exhibit a
dilatant fluidity (Figs. 1 and 2, curves 1 ), whereas the NU
clay suspension has a pronounced thixotropic behavior
(Fig. 1, curve 6; Fig. 2, curves 5 ) . All the compound sus
pensions exhibit a thixotropic type of fluidity. Suspensions
Refractories and Industrial Ceramics Vol. 42, Nos.3–4, 2001
1083-4877/01/0304-0106$25.00 © 2001 Plenum Publishing Corporation
The previous part of the series was published in No. 4 of 2000.
Belgorod State Technological Academy for Building Materials,
Belgorod, Russia; Kerabmet Research and Development Com
pany, Belgorod, Russia.
TABLE 1. Properties of the Original Suspensions
Nizhne-Uvel’skoe clay 48.0 1.52 0.31 15.7
Quartz sand 13.4 2.10 0.67 9.5
laboratory-ground 14.0 1.89 0.74 11.5
11.5 1.93 0.77 15.6
The material was ground at the DINUR Joint-Stock Company.