CHANGE IN CORUNDUM-ZIRCONIA CERAMIC PORE STRUCTURE
DURING HEAT TREATMENT
I. D. Kashcheev,
Yu. I. Komolikov,
and V. I. Pudov
Translated from Novye Ogneupory, No. 7, pp. 41 – 43, July 2015.
Original article submitted April 24, 2015.
Results are given for a study of sintering and its effect on corundum ceramic pore structure with addition of
zirconium dioxide. Powder composites of Al
(stabilized with 5 wt.% Y
) are prepared by slip
casting and different temperature sintering regimes. It is established that under stable uniform conditions the
original pore surface, sintering temperature, and isothermal soaking duration affect the change in pore surface
Keywords: corundum ceramic, zirconium dioxide, mercury porosimetry, slip casting.
Porous ceramic is currently of considerable importance
in various branches of engineering and technology. Its use is
especially justified in those cases when filtration, gas separa-
tion, and electrochemical processes are performed at high
temperature, and other materials appear to be unsuitable.
From the variety of specifications laid down for ceramic, its
structure, and connected with this properties, mainly overall
porosity, pore morphology, and size distribution, specific
surface and permeability, are decisive. It is apparent that a
study of change in pore structure properties during sintering
The specimens studied were prepared by slip casting in
gypsum molds. The starting materials for slip preparation by
well-known technology  were ZrO
powder grade DTsI-3
produced by the Cherepetsk Machine Plant and Al
GN produced by Bogoslovsk Mining and Concentration
Combine. The composition of specimens formed was varied
by the ratio of oxides during slip mixing. Molded specimens
were dried, then sintered in air at 1350°C, and soaking at the
final temperature was varied in the range from 0 to 240 min.
The specimens obtained by this method were studied by mer
cury porosimetry . Results of studies are given in Table 1.
The effect of specimen sintering duration at 1350°C on
the change in open porosity is shown in Fig. 1, from which it
follows that P
for specimens decreases with increase in
content, and also t of firing. Specimens containing
with soaking for 240 min have P
of 28% (see
Fig. l, curve 1 ), and specimens containing 15% ZrO
of 175 (see Fig. Fig. 1, curve 3). According to pore size
classification proposed in publication  it is possible to sep-
arate three groups of pores: macropores, size more than
2 mm; mesopores, size 2 – 0.5 mm, micropores, size less than
Data in Table 1 and Fig. 1 show that with an increase in
content there is an increase in the density of molded
specimens and the nature of pore size distribution changes;
Refractories and Industrial Ceramics Vol. 56, No. 4, November, 2015
1083-4877/15/05604-0383 © 2015 Springer Science+Business Media New York
FGBOU VPO Ural Federal University, Ekaterinburg, Russia.
FGBOU VPO Institute of Metal Physics, UrO RAN, Ekaterin
Fig. 1. Change in open porosity P
for specimens fired at 1350°C
on sintering duration t and ZrO
content, wt.%: 1 )5;2 ) 10; 3 ) 15.