PREPARATION OF ALUMINUM OXIDE CERAMIC PRECURSORS
BY DISPERSION OF ALUMINUM ALLOY D16
F. Z. Badaev,
V. P. Tarasovskii,
R. A. Novoselov,
A. Kh. Khairi,
and A. V. Reznichenko
Translated from Novye Ogneupory, No. 1, pp. 10 – 13, January 2015.
Original article submitted September 15, 2014.
A chemical method with reaction of aluminum alloy D16 and aqueous sodium hydroxide solution is used to
prepare very fine aluminum hydroxide powder. It is established by x-ray phase analysis that the powder ob
tained consists of three aluminum oxide modifications: gibbsite, boehmite, and bayerite. It is shown by laser
diffraction that within an aluminum oxide suspension there is extensive bimodal distribution of particle size
distribution (0.4 – 190 mm). The powder obtained is a precursor for preparing aluminum oxide ceramic.
Keywords: aluminum oxide ceramic, aluminum alloys, aluminum hydroxide, aluminum oxide, sodium hy
The problem of synthesizing very fine engineering ce-
ramic precursors capable of reaction is very important in
view of extensive use of oxide ceramics in the electrical and
radioelectronic industries for dielectric, semiconductor, pi-
ezoelectric, magnetic, cermet, and other objects .
Solid-phase synthesis of powders normally leads to total
occurrence of interaction reactions. Marked traces of original
phases remain within sintered objects. In this connection
chemical methods are important for preparing ultrafine pow
ders of simple and complex oxides, called precursors, whose
subsequent sintering guarantees preparation of highly dense
ceramic with a uniform structure, providing good operating
property reproducibility . In addition, compared with
other methods, chemical methods for preparing very fine
powders exhibit a low energy content and the possibility of
controlling particle formation .
Chemical dispersion is a method for very fine powder
preparation of different compounds by performing chemical
reactions with formation of insoluble particles of compounds
within a medium. Currently there is active study of alumi
num reactions with alkali. Reaction of aluminum with NaOH
solution is a complex heterogeneous process that is described
by a reaction equation
2Al + 2NaOH + 6H
O = 2Na[Al(OH)
As a result of this reaction it is possible to prepared alu-
minum hydroxide, and from this very fine aluminum oxide
powder. The aluminum hydroxide powder obtained is based
on movement of equilibrium of a reversible reaction to the
v + NaOH.
After heat treating Al(OH)
as a result of occurrence of
various modifications of aluminum oxide are obtained.
A study of aluminum alloy reaction with alkali solution with
the aim of preparing very fine powder is of practical impor
The aim of this work is preparation of very fine powder
by chemical reaction of aluminum alloy D16 with aqueous
sodium hydroxide solution and a study of its properties.
Refractories and Industrial Ceramics Vol. 56, No. 1, May, 2015
1083-4877/15/05601-0011 © 2015 Springer Science+Business Media New York
FGVPO VPO Moscow State Industrial University, Moscow, Russia.
ZAO NTTs Bakor, Shcherbinka, Moscow Region, Russia.