Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Preparation of Alumina by the Sol-Gel Process (II) Characteristics of Powders Obtained by Polymeric Alumina Sol

졸겔법에 의한 알루미나의 제조(II) : 중합졸로부터 제조한 분말의 특성

  • 이해욱 (연세대학교 요업공학과) ;
  • 김창은 (연세대학교 요업공학과) ;
  • 김구대 (한국과학기술연구원 세라믹스부) ;
  • 정형진 (한국과학기술연구원 세라믹스부)
  • Published : 1991.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Alumina precursor sol was obtained by the reaction of Al(OC4H9)3 and acetylacetone in the solvent followed by the partial hydrolysis. This sol was measured by viscosity and the effect of pH. The powders obtained from this sol were calcined at the various temperatures. The transition of crystals and crystal state were investigated at the various temperatures. The powders dried at 90$^{\circ}C$ showed amorphous and ${\gamma}$-Al2O3 at 900$^{\circ}C$, ${\alpha}$-Al2O3 mono-phase at 1050$^{\circ}C$ respectively. As a result of Al27-MASNMR analysis, amorphous and ${\alpha}$-Al2O3 powders showed 6-coordinated Al, ${\gamma}$-Al2O3 4-coordinated Al respectively.

Keywords

References

  1. Am Ceram. Soc. Bull. v.12 Sol-Gel Processing of Ceramic and Glass D.W. Johnson, Jr.
  2. J. Materials Science v.25 Dip-coating and Modifications of Lead Titanate and Lead Zirconate Titanate Films Y. Takahashi;K. Yamaguchi
  3. Am. Ceram Soc. v.74 no.1 Preparation of PbZrO₃-PbTiO₃Ferroelectric Thin Films by the Sol-Gel Process N. Tohge;S. Takahashi;T. Minami
  4. Better Ceramics Through Chemistry ⅳ Sol-Gel Processing of PbTiO₃Fibers S.I. Aoki;S.C. Choi;D.A. Payne;H. Yanagida
  5. J. Mat. Sci. Lett. v.5 no.1248 H. Unuma;K. Tokoda;Y. Suzuki;T. Furusaki;K. Kodaira;T. Matsushida
  6. J. Non-cryst Solids v.86 no.231 J.C. Debsikdar
  7. Ultrastructure Processing of Ceramics. Glasses and Composites C. Sanchez;F. Babonneau;S. Doeuff;A. Leaustic
  8. J. Non-cryst Solids v.74 no.11 M. Emill;L. Incoccia;S. Mobilio;G. Fagherazzi;M. Gughemi
  9. J. Mater Sci. v.20 no.44 J.C. Debsikdar
  10. J. Mat. Sci. v.20 Preparation of Transparent non-crystalline Stoichiometric Magnesium Aluminate Gel Monolith by the sol-gel Process J.C. Debskdar
  11. Sol-Gel Science C.J. Brinker;G.W. Scherer
  12. Am. Ceram Soc. Bull. v.54 no.3 Alumina Sol Preparation from Alkoxides B.E. Yoldas
  13. Proceedings of the Second International Conference Ceramic Powder Processing Science R. Naβ;H. Schmidt;H. Hausner(ed.);G.L. Messing(ed.);S. Hirano(ed.)
  14. J. Non-cryst Solids v.121 Synthesis of an Alumina Coating from Chelated Aluminum Alkoxides R Naβ;H. Schmidt
  15. J. Sol. Stat. Chem. v.30 The Dehydration of Boehmite S.J. Wilson
  16. J. Phys. Chem. v.86 Solid-State Magic-Angle Spinning Aluminum-29 Nuclear Magnetic Resonance Studies of Zeolites Using a 400-MHz High-Resolution Spectrometer C.A. Fyle;G.C. Gobbe;J.S. Hartman
  17. J. Am. Ceram Soc. v.68 no.9 Preliminary Characterization of Gel Precursors and Their High Temperature Products by $27^Al$ Magic-Angle Spinning NMR S. Komarneni;Rustum Roy