Consolidation of Al2O3 Nanopowder by Magnetic Pulsed Compaction and Sintering

Abstract:

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The effect of MPC pressure on the density, microstructure, mechanical properties, and electrical property of MPCed and sintered bulk was investigated. A detail characterization of the MPCed and sintered bulk has been performed using XRD, SEM, TEM, Vickers hardness tester, and breakdown voltage tester. The alumina powder used in this research has a size of 50-200 nm, a smooth surface and elliptical shape. The obtained density of MPCed and sintered bulk is increased with increasing MPC pressure from 0.5 to 1.25 GPa. The highest density of 92% in this research is obtained in the MPCed at 1.25 GPa and sintered bulk, while it is 90 % in the MPCed at 0.5 GPa. The different Vickers hardness with MPC pressure is associated with the different density and grain size of bulks. The maximum breakdown voltage of 47 kV/cm is achieved in the bulk MPCed at 1.25 GPa due to the higher density than that of others. In addition, the fracture mechanism of MPCed and sintered bulk is discussed.

Info:

Periodical:

Solid State Phenomena (Volume 118)

Edited by:

Jang Hyun Sung, Chan Gyu Lee, Yong Zoo You, Young Kook Lee and Jae Young Kim

Pages:

615-622

DOI:

10.4028/www.scientific.net/SSP.118.615

Citation:

S. J. Hong et al., "Consolidation of Al2O3 Nanopowder by Magnetic Pulsed Compaction and Sintering", Solid State Phenomena, Vol. 118, pp. 615-622, 2006

Online since:

December 2006

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Price:

$35.00

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