The results of a comparative study of compacts obtained from nano- and ultradispersed (UF) powders of aluminum oxide with a spherical shape of particles by the method of spark-plasma sintering are presented. It is shown that UF powder compacts achieve higher density, strength, microhardness, and structure homogeneity with finer grain than nanopowder compacts. Preliminary magnetic-pulse compaction of the powders before sintering improves the characteristics of both compacts, but UF powder compacts achieve greater density and strength with smaller grain sizes. In both cases of preliminary preparation, compacts obtained from UF powder have advantages over compacts obtained from nanopowder.
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