MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Precompaction Effects on Density and Mechanical Properties of Al2O3 Nanopowder Compacts Fabricated by Magnetic Pulsed Compaction
S. J. HongJ. M. KooJ. G. LeeM. K. LeeH. H. KimC. K. Rhee
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2009 Volume 50 Issue 12 Pages 2885-2890

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Abstract

In this study, the effects of precompaction on the density, microstructure, mechanical and electrical properties of α-Al2O3 bulks fabricated by the combined application of magnetic pulsed compaction (MPC) and a sintering process were reported. The obtained density of the α-Al2O3 bulks prepared by the combined processes increased with the increasing MPC pressure and precompaction pressure. The resultant higher hardness and breakdown voltage of the consolidated bulks following combined application of the magnetic pulsed compaction, precompaction and sintering process could be attributed to the homogeneously distributed ultra-fine microstructure than that of general processing, suggesting that the grain growth was remarkably reduced during the MPC processes.

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© 2009 The Japan Institute of Metals and Materials
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