文档介绍：Combustion, Explosion, and Shock Waves, Vol. 38, No. 4, pp. 478–483, 2002
Ultrafine α-Al2O3.
Explosive Method of Synthesis and Properties
A. A. Bukaemskii,1 S. S. Avramenko,1 UDC + +
and L. S. Tarasova1
Translated from Fizika Goreniya i Vzryva, Vol. 38, No. 4, pp. 112–118, July–August, 2002.
Original article submitted October 13, 2000; revision submitted August 31, 2001.
An explosive method for producing ultrafine α-Al2O3 is developed and optimal synthe-
sis parameters are determined. Particles of ultrafine α-Al2O3 have a spherical shape
and are separated from one another. The size distribution is log-normal (number-
averaged size 70 nm and variance ). Special features of phase transitions in ul-
trafine aluminum oxide under shock-wave action are studied. Results of x-ray phase
0
analysis suggest stabilization of the new high-pressure phase δ-Al2O3 with a face-
centered cubic lattice with a parameter a = A.˚
Key words: metastability, corundum, shock-wave synthesis, surface, modification.
Most physical methods for producing ultrafine ma- in metastable modifications: γ+ δ[2], δ+ δ-AlON [4],
terials are based on vaporization of the starting material and δ+ θ[7]. The set and proportion of the phases
and subsequent condensation of the final product [1]. are determined by synthesis conditions. The effect of
These methods employ d