Consolidation of Al₂O₃ Nanopowder by Magnetic Pulsed Compaction and Sintering

Abstract:

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.

• Periodical: Solid State Phenomena (Volume 118)
• Pages: 615-622
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.118.615
• Online since: December 2006
• Authors: Soon Jik Hong, Jong Keuk Lee, Min Ku Lee, Wheung Whoe Kim, Chang Kyu Rhee
• Keywords: Al₂O₃ Nanoparticles, Consolidation, Magnetic Pulsed Compaction (MPC), Sintering

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