The structure formation of Al[2]O[3] nanoceramics at high pressure sintering
V.S. Urbanovich, ISSSP NASB, 17, P.Brovka Str., 220072, Minsk,
Belarus, R.A. Andrievski, IPCP RAS, 142432, Chernogolovka, Moscow
Region, Russia, G.P. Okatova, IPM NASB, 41, Platonov Str., 220071,
Minsk, Belarus, E. Benko, IMC, 37a, Wroclawska Str., 30-011, Cracow,
Technical University, 2, Willowa Str., 43-309, Bielsko-Biala, Poland.

Evolution of the structure and physical and mechanical properties of
nanostructured alumina ceramics depending on sintering regimes under
the pressures from 2.5 to 4 GPa at the temperatures from 700 to 1500
oC have been investigated. Al[2]O[3] nanopowder prepared by hydrolysis
of sheet aluminum with the following decomposition of hydroxide (S[
] = 48.5 m2/g, d[s]~30 nm) was used as initial. X-ray diffraction and
SEM, were used for investigations. Microhardness and fracture
toughness were measured. The highly dense a-Al[2]O[3] nanoceramics
with density of 3.99 g/cm3 without any additives has been obtained.
Peculiarities of recrystallization as well as relationship of
properties and grain size of nanoceramics are discussed in detail.
This research is sponsored by NATO's Scientific Affairs Division
in the framework of the Science for Peace Programme (Project No
973529)

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