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Combustion, Explosion and Shock Waves

2002 year, number 4

Ultrafine О±-Al2O3. Explosive Method of Synthesis and Properties

A. A. Bukaemskii, S. S. Avramenko, and L. S. Tarasova
Physicotechnical Institute of the Krasnoyarsk State University, Krasnoyarsk 660036, buksir@nifti.krasnoyarsk.ru
Pages: 478-483

Abstract

An explosive method for producing ultrafine α-Al2O3 is developed and optimal synthesis 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 1.9). Special features of phase transitions in ultrafine aluminum oxide under shock-wave action are studied. Results of x-ray phase analysis suggest stabilization of the new high-pressure phase δ'-Al2O3 with a face-centered cubic lattice with a parameter a = 8.53 Å.
Key words: metastability, corundum, shock-wave synthesis, surface, modification.