Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Thermal Behavior of Transformation by Simultaneous $\alpha$-$Al_2O_3$ Seed Addition on the Al-Sec-Butoxide Hydrolysis

Al-Sec-Butoxide의 가수분해시에 있어서 $\alpha$-$Al_2O_3$종의 동시첨가에 의한 열적 전이거동

  • 김창은 (연세대학교 공과대학 요업공학과) ;
  • 이해욱 (연세대학교 공과대학 요업공학과) ;
  • 최진관 (연세대학교 공과대학 요업공학과) ;
  • 김배연 (인천대학교 공과대학 재료공학과)
  • Published : 1990.06.01
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Abstract

The thermal behavior of transformation and characteristics of seeded sample powders prepared by simultaneous $\alpha$-Al2O3 seed addition with water on the Al-sec-butoxide hydrolysis were studied. $\alpha$-Al2O3 seed particles are shown to act as nuclei for transformation of $\theta$-to $\alpha$-Al2O3 and to result in an increase in thetransformation kinetics and lowering of the transformation temperature by as much as 143$^{\circ}C$. Simultaneous seed addition on the hydrolysis resulted in uniform dispersin and creation of nucleation site on seed surface and only 0.1wt% seeding lowered the transformation temperature by as much as 115$^{\circ}C$. For 3wt% seed addition, $\alpha$-Al2O3 single phase was obtained at 95$0^{\circ}C$ for 100 minutes and the specific surface area of products were lowered to 11.9$m^2$/g as compared with that of $\alpha$-Al2O3 powder prepared without seed at 115$0^{\circ}C$ ; 15.1$m^2$/g due to depression of vermicular structure growth.

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References

  1. Fortscher Mineral. v.39 no.1 Polymorphism and Phase Transformations M.J. Buerger
  2. Proggess in Solid State Chem. v.4 Phase Transformation in Solids C.N. Rao;K.J. Rao
  3. J. Mat. Sci. v.11 The Mechanism of Simultaneous Sintering and Phase Transformation in Alumina P.A. Badkar;J.E. Bailey
  4. J. Am. Ceram. Soc. v.67 no.11 Enhanced Densification of Boehmite Sol-Gels by α-Al₂O₃ Seeding M. Kumagai;G.L. Messing
  5. Nagoya Kogyo Gijutsu Shikensko Hokoku v.11 Effects of Metallic Oxides on Alpha Transformation of Alumina Y. Wakao;T. Hibino
  6. J. Am. Ceram. Soc. v.57 no.8 Influence of Cr and Fe on Formation of α-Al₂O₃ from γ-Al₂O₃ G.C. Bye;G.T. Simpkin
  7. J. Solid State Chem. v.34 A Kinetic Study of the System Gamma AlOOH/Al₂O₃ S.J. Wilson;G.D. McConnell
  8. J. Am. Ceram. Soc. v.68 no.9 Controlled Transformation and Sintering of Boehmits Sol-Gel by α-Al₂O₃ Seeding M. Kumagai;G.L. Messing
  9. J. Non. Cryst. Solids v.82 α-Al₂O₃ Transformation in Seeded Boehmite Gels R.A. Shellelman;G.L. Messing;M. Kumagai
  10. J. Am. Ceram. Soc. v.71 no.5 Liquid-Phase-Assisted Transformation of Seeded γ-Alumina R.A. Shellelman;G.L. Messing
  11. Am. Ceram. Soc. Bull. v.54 no.3 Alumina Sol Preparation from Alkoxides B.E Yoldas
  12. J. Mat. Sci. v.10 Alumina Gels that from Porous Transparent Alumina B.E. Yoldas
  13. Am. Ceram. Soc. Bull. v.54 no.3 A Transparent Porous Alumina B E. Yoldas
  14. Tech. Paper no.19 Oxides and Hydroxides of Aluminum K. Wefers;G.M. Bell
  15. J. Am. Ceram. Soc. v.44 no.12 Fibrillar Colloidal Boehmite;Progressive Conversion to Gamma, Theta and Alpha Aluminas R.K. Her
  16. Mineral Mag v.43 The Development Porous Microstructures during the Dehydration of Boehmite S.J. Wilson
  17. J. Thermal Anal. v.5 Critical Examination of Several Problems Typically Found in the Kinetic Study of Thermal Decomposition Under Vacuum J. Rougueral
  18. Proc. Br. Ceram. Soc. v.28 Phase Transformations and Development of Microstructure in Boehmite-Derived Transition Aluminas S.J. Wilson
  19. J. Colloid Interface Sci. v.82 no.2 The Porosity of Alumium Oxide Phase Derived from Well-Crystallized Boehmite S.J. Wilson;M H. Stacey
  20. Ind. Eng. Chem. v.42 Thermal Transformations of Aluminas and Alumina Hydrates H.C. Stumpf;A.S. Russell;J.W. Newsome;C.M. Tucker
  21. Ultrastructure Proc. of Ceram., Glass and Composites Alpha Alumina Formation in Al₂O₃ Gels F.W. Dynys;J.W. Halloran
  22. J Appl. Chem. Biotechnol. v.23 Hydrolysis of Aluminum Alkoxides and Bayerite Conversion B E. Yoldas
  23. J. Am. Ceram. Soc. v.71 no.1 Hydrolysis in the Al-Sec-Butoxide-Water-Isopropyl Alcohol System66.Ⅰ. Rheology and Gle Structures J.Y. Chane Ching;L.C. Klein
  24. J. Am. Ceram. Soc v.71 no.1 Hydrolysis in the Al-sec-butoxide-Water-Isopropyl Alcohol System; Ⅱ, Aging and Microstructure J.Y. Chane Ching;L.C. Klein
  25. Crystallization and Crystal Chemistry F.D. Bloss