EFFECT OF COMPOSITION AND STRUCTURE
ON THE PROCESSING PROPERTIES AND CHARACTERISTICS
OF SHAPED REFRACTORIES MADE OF A NANOSTRUCTURED
MULTI-FUNCTIONAL COMPOSITE CERAMIC
A. R. Murzakova,
E. A. Goncharenko,
and É. A. Khaidarshin
Translated from Novye Ogneupory, No. 4, pp. 24 – 26, April, 2014.
Original article submitted October 10, 2013.
This article examines the effect of composition and structure on the processing properties of shaped refractory
products obtained from nanostructured multi-functional composite ceramics by extrusion.
Keywords: nanostructured multi-functional composite ceramic, shaped refractories, extrusion
Methods have been developed for making refractories
from ceramics, composite ceramics, and nanostructured
composite ceramics (NCCs). The processing properties of
these refractories depend on the methods used to make the
materials and shape them into finished products.
Nanostructured composite ceramics are currently made
by dry and semi-dry pressing and plastic forming. Among
the distinctive features of unfired nanostructured composites
are their ability to form solid-phase structures at relatively
low temperatures and their capacity for retaining their origi
nal strength characteristics when heated to high temperatures
during service . The products acquire their prescribed
properties during subsequent heat treatment at temperatures
which are considerably lower than the temperatures required
for similar ceramics without the use of nanoscopic binders.
The change that takes place in the strength of the ceramic
composite shows that its final strength is obtained after heat
treatment at 300°C or more. The higher strength is the result
of chemical reaction of the filler with the nanoscopic binder.
The goals of the investigation being discussed in this ar
ticle were to develop an extrusion-based technology for mak
ing shaped refractories based on nanostructured composite
ceramics and to determine the effect of the main parameters
of the material on the properties of the refractory product.
Ceramic pipes and other shaped refractories were formed
on vacuum piston extruder ECT-Piston Press (Germany).
The extruder develops a maximum extrusion pressure of
300 MPa (Fig. 1). In accordance with the technology used to
extrude refractories based on nanostructured composite ce-
ramics, first the liquid binders that were used were mixed
with the powder part (oxides of metals) until a homogeneous
plastic mass was formed. Different types of ceramic fillers
were added to the mass, the exact filler or fillers depending
on the technical conditions under which the products were
Refractories and Industrial Ceramics Vol. 55, No. 2, July, 2014
1083-4877/14/05502-0128 © 2014 Springer Science+Business Media New York
Bashkir State University, Ufa, Russia.
Fig. 1. ECT-Piston Press vacuum press (Germany).