STUDY AND DEVELOPMENT OF COMPOSITIONS OF COMPOUNDS
FOR THE MANUFACTURE OF CORDIERITE MATERIALS
D. V. Yurchuk
and V. A. Doroganov
Translated from Novye Ogneupory, No. 10, pp. 48 – 50, October, 2011.
Original article submitted April 28, 2011.
It is shown that it is possible to obtain a binder suspension based on synthetic materials in the system
O. The basic properties of the suspensions and the synthetic materials thus obtained on the
basis of these materials are studied. The optimal methods of molding cordierite materials as a function of the
type of binder employed are established.
Keywords: cordierite, high-concentration ceramic binder suspension, physico-mechanical characteristics,
ammunition, electroinsulating ceramics
The significant interest in cordierite ceramics is due to a
number of its valuable properties, for example, low tempera-
ture coefficient of linear expansion, capacity to counteract
sharp temperature drops, high chemical stability, and dielec-
tric properties. Because of the combination of high thermal
stability with dielectric properties, cordierite articles may be
used as heat-resistant electrically insulating materials. Cordi-
erite ceramics are also used as catalyst carriers for the purifi-
cation of the exhaust gases of internal combustion engines, in
filters for water purification, and for other purposes .
According to the data of , magnesial (talc, magnesite,
forsterite, etc.) and aluminoferous (kaolinite clay) stock as
well as rock (dunite, serpentinite) are used for the production
of cordierite ceramic.
Nearly all deposits of high-quality kaolinite clay are situ
ated outside Russia, a fact which is responsible for the short
age of domestic kaolin stock. The present study is concerned
with determining whether it is possible to obtain cordierite
ceramic on the basis of low-quality kaolinite clay, different
types of aluminoferous stock (technical-grade alumina, com
mercial-grade and high-alumina chamotte), talc, and quartz
glass with the goal of expanding the raw material base for the
production of cordierite.
Studies of the properties of synthetic materials produced
on the basis of cordierite compositions was carried out and
optimal methods of molding were selected. The studies were
performed on the basis of the following four compositions:
– A — Scrap of cordierite articles;
– B — 38.3% Onotsk deposit talc; 48.1% LT-1 clay;
13.6% technical-grade alumina preactivated at 1000°C;
– C — 38.4% Onotsk deposit talc; 46.1% commer-
cial-grade chamotte; 15.5% technical-grade alumina;
– D — 40.7% Onotsk deposit talc; 46.2% high-alumina
chamotte; 13.1% quartz sand.
A binder suspension was prepared on the basis of all the
compositions according to the technology used to fabricate
high-concentration ceramic binder suspensions . Cordier-
ite scrap was preliminarily ground and separated into frac
tions. The first fraction (<0.25 mm) was used to produce
high-concentration ceramic binder suspensions while the
second (0.25 – 5 mm) was used together with the first as
filler in the subsequent studies.
Samples were manually molded on the base of composi
tion B. The samples were then subjected to preliminary ther
mal activation at 1000°C to realize all the physico-chemical
processes that occur in clay. The thermoactivated samples
were crushed and the crushed thermoactivated material was
used to fabricate high-concentration ceramic binder suspen
sions, The basic characteristics of the resulting suspensions
of the cordierite composition are presented in Table 1.
The rheological characteristics of the obtained suspen
sions were determined; these may be found in Fig. 1. The
flow of high-concentration ceramic binder suspension based
on compound A is dilatants in nature and the effective viscos
ity of the suspension itself is reduced. High-concentration ce
ramic binder suspension based on composition B is charac
terized by thixotropic-type flow with minimal value of the
viscosity in the area of elevated gradient of the shear rate.
High-concentration ceramic binder suspensions based on
Refractories and Industrial Ceramics Vol. 52, No. 5, January, 2012
1083-4877/12/05205-0377 © 2012 Springer Science+Business Media, Inc.
St. Petersburg State University, St. Petersburg, Russia.
Shukhov State Technological University, Belgorod, Russia.