SCIENTIFIC RESEARCH AND DEVELOPMENT
STRUCTURE AND PHASE COMPOSITION OF CERAMIC MATERIALS
PREPARED FROM ALUMINUM HYDROXIDE POWDER
BY CHEMICAL DISPERSION OF ALUMINUM-MAGNESIUM ALLOYS
A. Yu. Omarov
and Yu. G. Trifonov
Translated from Novye Ogneupory, No. 9, pp. 37 – 40, September, 2013.
Original article submitted March 15, 2013.
Results are provided for petrographic and X-radiographic analyses of aluminum oxide materials prepared
from aluminum hydroxide powder by chemical dispersion of aluminum-magnesium alloys containing 6 and
12 wt.% magnesium, and sintered from them. Phase composition and structural features are discussed, and
phase analysis data are compared with those obtained by different determination methods.
Keywords: ceramic materials, aluminum hydroxide powder, chemical dispersion, aluminum-magnesium
Development of ceramic technology, and mainly high
quality powders as raw materials, also as additives, and
sintering theory, show that the possibility of creating new
forms of ceramic based on oxides and their compounds, in
cluding those based on aluminum oxide, is far from ex
hausted. Development of new processing solutions, and the
principles of selecting a required powder, facilitate creation
of new materials with respect to quality and expansion of the
field of their application .
Extensive use in various fields of industry  of ceramic
materials based on aluminum oxide is due to a special set of
properties, i.e., high operating temperature, strength, thermal
shock resistance, and chemical stability. In creating ceramics
for different functional purposes the main requirement is
preparation of material with a prescribed structure and good
physicomechanical properties. The aim of this work is a
study of the structure and phase composition of aluminum
oxide materials prepared from aluminum hydroxide powder
by chemical dispersion of aluminum-magnesium alloys.
TEST SPECIMEN PREPARATION PROCEDURE
Aluminum oxide ceramic test specimens were prepared
as a result of performing the following processing opera-
Chemical dispersion of Al–Mg alloy containing 6 and
12 wt.% magnesium was accomplished by treatment with
20% aqueous caustic soda solution. Dispersion was carried
out in a vessel made of heat-resistant and chemically stable
glass with continuous heat removal (by means of a water
bath), and stirring.
Precipitate filtration was accomplished from the mother
liquor and washed repeatedly with distilled water by vacuum
filtration using a Buchner funnel and a Bunsen flask. The
volume of water expended for each act of washing was one
liter. There were twelve acts of washing.
Deposit drying was performed in air at 60ºC to zero
moisture content. Preparation of a loose dry product and ab
sence of strong aggregates was provided with the tempera
Deposit heat treatment was carried out in air at 1400ºC
for 1 h. total; transfer of the deposit hydroxide component
into high-temperature oxide modifications was achieved at
the temperature selected. The aim of heat treatment was a re
duction in pressed specimen shrinkage during subsequent
Refractories and Industrial Ceramics Vol. 54, No. 5, January, 2014
1083-4877/14/05405-0362 © 2014 Springer Science+Business Media New York
FGBOU VPO Moscow State Industrial University, Russia.