CERAMIC TUBULAR OBJECTS MADE FROM COMPOSITE CERAMIC
A. R. Murzakova,
K. A. Vasin,
I. A. Fakhretdinov,
R. K. Khismatullin,
and R. U. Shayakhmetov
Translated from Novye Ogneupory, No. 2, pp. 40 – 42, February, 2012.
Original article submitted September 23, 2011.
Manufacturing technology is considered for ceramic tubular objects for refractory and engineering purposes
with specified operating properties based on composite ceramics.
Keywords: composite ceramics, tubular ceramic objects.
In order to manufacture thick-walled (2 – 4 mm) long
(up to 2000 mm) ceramic pipes and tubular objects by tradi
tional sintering technology [1, 2] certain complications arise,
connected with considerable energy consumption, significant
output of scrap objects, and the complexity of selecting opti-
mum process parameters in relation to the type of raw mate-
rial, etc. Currently there is considerable interest in creating
new composite ceramic materials and object technology
based on organic binders, especially as the use of composite
materials is acquiring greater importance in metallurgy, engi-
neering, construction, and other branches of industry. There-
fore, the aim of this work was to develop manufacturing
technology for tubular objects for refractory and engineering
purposes with the required operating properties based on
In ceramic composite material technology, at least one of
the decisive stages is controlled by nanosized structures.
Hardening of unfired ceramic materials is provided by col
loidal systems (nanosystems). It is well known that this stage
is decisive since within it prerequisites are laid down for fur
ther evolution of the material structure and its properties.
Nanostructures provide composite material properties, and
this has been known for a long time and used extensively.
Composite materials have been developed whose struc
ture includes the fact that in contrast to traditional ceramics
nanoparticles provide sintering and formation of a strong
structure within them at low temperature. The materials ob
tained exhibit fundamentally new properties for both pro
cessing and operational parameters. Nanodispersed binders
provide sintering of ceramics of refractory compounds and
highly refractory oxides, for example silicon and aluminum
, in the temperature range from 700 to
1400°C. Introduction of nanodispersed binder in an amount
of 2 – 4 wt.% to the overall volume of a charge of powder
materials provides its mobility and fluidity with a moisture
content not more than 20 – 30 wt.%, as normally, and with a
moisture content of 4 – 5 wt.%, which makes it possible to
create materials and objects from them of complex configu-
ration with previously unattainable properties. This is ex-
plained by the fact that a binder with particles of size less
than 200 nm have a specific surface of more 100 m
this provides and unprecedented high degree of nanoparticle
distribution over the surface of particles of materials being
molded, sufficient for creating active surface bonds, which
also leads to a sharp improvement in system properties.
On the basis of nanoprocesses, occurring during struc
ture formation of ceramic composite materials in an inor
Refractories and Industrial Ceramics Vol. 53, No. 1, May, 2012
1083-4877/12/05301-0059 © 2012 Springer Science+Business Media, Inc.
GOUVPO M. Akhmulla Bashkir State Pedagogical University,
GUP BashNIIstroi, Ufa, Russia.
Bashkir State University, Ufa, Russia.
Fig. 1. Kinetics of change ultimate strength in compression s
filler–binder composition at temperatures indicated on curves.