Paper Title:
Investigation of Phase Composition in Dense and Porous Gelcast Alumina Sintered under Argon Atmosphere
  Abstract

This study investigates the phase compositions in gelcast dense alumina and porous alumina that were sintered in an inert atmosphere. Both materials were gelcasted using identical slurry composition except for adding surfactant to slurry intended for porous shaping. The resulting gelcasted samples were dried and then sintered in argon gas at 1700oC. The X-ray photoelectron analysis was used for identifying the phase compositions in sintered samples, which was supported with TG/DTA and electrical measurements. Results showed that, in addition to alumina and carbon phases, the dense sample yielded Al4C3 and Al, while porous sample yielded aluminum oxycarbides. The formation of these phases reduced the carbon content through different chemical reactions to a limited extent because they formed a protective layer on alumina grains, which prevented the direct contact between alumina and carbon. Subsequent measured electrical resistivities of dense and porous alumina were, respectively, 0.20 and 0.32 ,-cm, indicating that the carbon networks are preserved in both materials.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
2123-2126
DOI
10.4028/www.scientific.net/MSF.561-565.2123
Citation
R. L. Menchavez, M. Fuji, T. Yamakawa, T. Endo, M. Takahashi, "Investigation of Phase Composition in Dense and Porous Gelcast Alumina Sintered under Argon Atmosphere", Materials Science Forum, Vols. 561-565, pp. 2123-2126, 2007
Online since
October 2007
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