AND CREEP OF NANOSTRUCTURED COMPOSITE CERAMICS
BASED ON ALUMINUM OXIDE
U. Sh. Shayakhmetov
and A. R. Murzakova
Translated from Novye Ogneupory, No. 6, pp. 20 – 24, June, 2014.
Original article submitted March 18, 2014.
High-temperature deformation and creep of nanostructured composite ceramic based on aluminum oxide are
studied by experiment. Ceramic composite compositions are developed based on aluminum oxide and inor
ganic binder, and physicochemical features of high-temperature processes during their formation are studied.
Research results make it possible to predict ceramic behavior in service and to optimize preparation technol
ogy for ceramic materials with prescribed properties.
Keywords: nanostructured composite ceramic, inorganic binder, aluminum oxide.
Ceramic materials are used extensively in various
branches of engineering, especially in extreme conditions
with action of thermal, mechanical, and other forms of loads.
During ceramic material development it is necessary to ob-
serve the interconnection of construction – operating condi-
tions – material. For ceramics it is particularly important to
determine strength properties over a wide temperature range.
In order to determine field of engineering within which it is
desirable to use ceramic materials it is necessary to study
material deformation properties in a creep regime and
high-temperature creep mechanisms.
Deformability relates to a process specifying material be
havior with application of an external mechanical load over a
long time. Deformation and time to failure are normally
called endurance and stress-rupture strength. Actual creep
and endurance are indices characterizing material behavior
under load up to failure under steady-state high-temperature
conditions . Determination of ceramic material creep and
endurance makes it possible to predict material behavior un
der service conditions.
Nanosize structures, arising directly at a solid phase sur
face, and also within an adjacent layer of liquid phase, are
definitive for the properties of materials obtained. A study of
them makes it possible to create new technology and new
materials with a higher level of physicotechnical properties.
Nanotechnology processes are promising for preparing un-
fired nanocomposites. It is well known that an incrase in
temperature accelerates diffusion mass transfer and aggrega-
tion, which lead to nanoparticle growth beyond nanosize lim-
its. Retention of nanosizes is provided at low temperature. At
the same time, it is well known that nanoparticles have a
strong effect on a system as a whole, i.e., on the whole mate
rial, and give it new properties. This opens up ways for ob
taining new nanocomposites. A feature of the structure of a
nanocomposite involves the fact that in contrast to traditional
ceramic nanoparticles provide sintering and formation of a
strong structure with a composite at low temperature.
Nanostructures govern the properties of phosphate mate
rials, which are well known and used widely. At the same
time, use of new methods for studying nanosystems will
make it possible to develop new composites with prescribed
properties. Currently preparation of ceramic composites and
oxides based on inorganic binders is being accomplished.
Objects consume little energy, their technology is waster-
free, and they are used instead of sintered ceramics.
Unfired composite materials (CM) have been developed
on the basis of aluminum oxide and phosphate binders (PB),
which have a polymeric structure. Hardening of these materi
als is provided by colloidal systems (nanosystems).
Model experiments for studying creep have been per
formed on compositions of the finely ground system
with a specific powder surface of 2.1 m
Refractories and Industrial Ceramics Vol. 55, No. 3, September, 2014
1083-4877/14/05503-0236 © 2014 Springer Science+Business Media New York
FGBOU VPO Bashkir State University, Ufa, Bashkortostan Re