Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Preparation of Seeded Alumina from Alkoxide (I): Powders

알콕사이드로부터 Seed가 첨가된 알루미나의 제조(I): 분말특성

  • 김창은 (연세대학교 공과대학 요업공학과) ;
  • 임광일 (연세대학교 공과대학 요업공학과) ;
  • 이해욱 (연세대학교 공과대학 요업공학과)
  • Published : 1992.05.01
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Abstract

The powder characteristics of seeded alumina prepared from alkoxide by sol-gel method were studied. When ${\alpha}$-Al2O3 seeded powders used, these ${\alpha}$ phase transformation temperatures decreased than those of unseeded powders by 110$^{\circ}C$ and fine powders under 0.1 $\mu\textrm{m}$ could be obtained. When Fe-nitrate added powders used, fast transformation rate resulted from ionic effects of Fe3+, but hard aggregated morphology exhibited. When ${\alpha}$-Al2O3 and Fe nitrate simultaneously added, these powders represented lower transformation temperature but resulted in microstructure with aggregated particles.

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References

  1. Chemical Synthesis of Advanced Ceramic materials David Segal
  2. Am. Ceram. Soc. Bull. v.64 no.12 Sol-Gel Processing of Ceramics and Glasses D.W. Johnson, Jr.
  3. Tech Paper No. 19 Oxides and Hydroxides of Aluminum K. Wefers;G.M. Bell
  4. J. Am. Ceram. Soc. v.44 no.12 Fibrillar Colloidal Boehmite: Progressive Conversion to Gamma,Theta and alpha Aluminas R.K. Iler
  5. Mineral Mag. v.43 The Development Porous Microstructures During the Dehydration of Boehmite S.J. Wilson
  6. Fortscher Mineral v.39 no.1 Polymorphism and Phase Transformations M.J. Buerger
  7. Progress in Solid State Chem. v.4 Phase Transformation in solids C.N. Rao;K.J. Rao
  8. Nagoya Kogyo Gijutsu Shikensko Hokoku v.11 Effects of Metallic Oxides on Alpha Transformation of Alumin Y. Wakao;T. Hibino
  9. J. Am. Ceram. Soc. v.57 no.8 Influence of Cr and Fe on Formation of α-Al₂O₃from γ-Al₂O₃ G.C. Bye;G.T. Simpkin
  10. J. Solid State Chem. v.34 A Kinetic Study of the System Gamma AlOOH/Al₂O₃ S.J. Wilson;G.D. McConnell
  11. J. Mater. Res. v.2 no.4 Microstructural Evolution in Sintering of AlOOH Gels W.A. Yarbrough;R. Roy
  12. J. Am. Ceram. Soc. v.68 no.9 Controlled Transformation and Sintering of a Boehmite Sol-Gel by α-alumina Seeding M. Kumagai;G.L. Messing
  13. J. Am. Ceram. Soc. v.69 no.5 Seeding with γ-alumina for Transformation and Microstructure Control in Boehmite-Derived α-alumina J.L. McArdle;G.L. Messing
  14. Adv Ceram. Mater. v.3 no.4 Transformation and Microstructure Control in Boehmite-Derived Alumina by Ferric Oxide Seeding J.L. McArdle;G.L. Messing
  15. J. Am. Ceram. Soc. v.54 no.3 Alumina Sol Preparation from Alkoxides B.E. Yoldas
  16. 세라믹스트를 위한 결정화학 박정현
  17. J. Mater. Sci. The Mechanism Simultaneous Sintering and Phase Transformation in Alumina P.A. Badkar;J.E. Bailey