졸-겔법에 의한 알루미나 화이버의 ${\gamma}-LiAlO_2$ 코팅

${\gamma}-LiAlO_2$ Coating on Alumina Fibers by the Sol-Gel Method

  • 현상훈 (연세대학교 세라믹공학과) ;
  • 홍성안 (KIST 화공연구부) ;
  • 김완식 (연세대학교 세라믹공학과) ;
  • 신현철 (연세대학교 세라믹공학과)
  • 발행 : 1994.11.01

초록

The surface of commercial alumina fibers used for reinforcing the MCFC matrix has been coated with ${\gamma}$-LiAlO2 being the same material as the matrix, by the sol-gel method in order to enhance the corrosion resistivity of alumina fibers. Stable LiAlO2 complex polymeric sols for coating was synthesized by mixing aluminum alkoxide polymeric sols with LiNO3 solution. It was found that the LiAlO2 polymeric sol prepared by adding the mixed chelate of acethylacetone and triethanolamine (the mole ratio of AA/TEA = 0.125/0.75) to the 1 mole of the aluminum alkoxide had the excellent stability and coating behavior. The crystalline structure of the dried gel from the ${\gamma}$-LiAlO2 sol was completely transformed into the ${\gamma}$-LiAlO2 at $600^{\circ}C$. The optimum viscosity of the sol for coating the alumina long fibers was 30~40 cP, while it was 12~20 cP in case of the short fiber coating. The ${\gamma}$-LiAlO2 coated alumina fibers without defects fully densified when heat-treated at 120$0^{\circ}C$.

키워드

참고문헌

  1. Van Nostrand Peinhold Fuel Cell Handbook A.J. Appleby;F.R. Foulkes(Ed.)
  2. Molten Carbonate Fuel Cell Technology J.R. Selman;D.A. Shores;H.C. Maru;I. Uchida
  3. Japanese Pat. 60,241,656 Electrolyte Tile for MCFC H. Ozu et al.
  4. Ceram. Eng. Sci. Proc. v.12 no.7-8 Continuous Fiber Coating System W.J. Lackey;John A. Hamgofsky
  5. Ceram. Eng. Sci. Proc. v.11 no.7-8 A Perspective on Fiber Coating Technology D.C. Cranmer
  6. Ceram Eng. Sci. Proc. v.12 no.1-2 Fiber Coating for Ceramic Matrix Composites H.W. Carpenter;J.W. Bohlen
  7. Noyes Data Corp. v.303 Eletroless Plating and Coating of Metals J. McDermott
  8. Tech. Rept. No. NBSIR 88-3798 Mechanical Property Enhancement in Ceramin Matrix Composites S.W. Freiman;T.W. Coyle;E.R. Fuller;Jr. P.L. Swanson;D.C. Cranmer;W. Haller
  9. U.S. Pat. No. 4,376,804 Pyrolyzed Pitch Coatings for Carbon Fiber H. Kalzman
  10. Ceram. Eng. Sci. Proc. v.11 no.9-10 Coating of Fibers by Colloidal Techniques in Ceramic Composites S.G. Malghan;D.B. Minor;P.S. Wang;C.P. Ostertag
  11. U.S. Pat. No. 5,039,550 Colloidal Processing Method for Coating Ceramic Peinforcing Agents S.G. Malghan(et al.)
  12. Ceram. Eng. Sci. Proc. v.10 no.7-8 Stress Relaxation in Sintering of Fiber-Reinforced Composites Through Fiber Coating C.P. Ostertag;S.G. Malghan
  13. U.S. Pat. No.5,024,859 Method for Applying an Oxide Barrier Coating to a Reinforcing Fiber M.L. Millard(et al.)
  14. Ceram. Eng. Sci. Proc. v.5 no.7-8 Sol-Gel Derived Coatings on SiC and Silicate Fibers J.J. Lannutti;D.E. Clark
  15. Ceram. Eng. Sci. Proc. v.5 no.7-8 Sol-Gel Derived Coatings on SiC andd Silicate Fibers R.S. Hay;E.E. Hermes
  16. Ceram. Eng. Sci. Proc. v.12 no.7-8 Sol-Gel Coating of Fiber Tows R.S. Hay
  17. Ceram. Eng. Sci. Proc. v.12 no.7-8 Novel Sol-Gel Coating Techniques for Ceramic Tows:In-Situ Curing vs Reaction Bonding D.A. Haxlebeck;I.Y. Glatter;H.H. Streckert
  18. Ultrastructure Processing of Advanced Ceramics J.D. mackenzie;D.R. Ulrich
  19. J. Am. Cera. Bull. Alumina Sol Preparation from Alkoxides B.E. Yoldas
  20. J. Non-Cryst. Solids v.100 Preparation of Alumina Fibers by Sol-Gel Method T. Make;S. Sakka
  21. Progress in Solid State Chemistry v.18 Sol-Gel Chemixtry of Transition Metal Oxides J. Livage;M. henry;C. Sanchez
  22. J. Am. Cram. Soc. v.77 no.1 alkoside Hydroxide Poute for the Preparation of γ-LiAlO₂-Based Ceramics O. Renoult;J.P. Boilot;M. Boncoeur
  23. J. Am. Ceram. Soc. v.70 no.3 Synthesis of LiAlO2 Plwder by Hydrolysis of Metal Alkoxides S.I. Hirano;T. hayashi;T. Kogeyama
  24. J. Non-Cryst. solids v.82 Effects of Temperature on Formation of Silica Gel M.W. Cloby;A. Osaka;J.K. Mackenzie
  25. Solid State Ionics v.37 Morphology of Electrochemical Vapor Edpositied Yttria-Stabilized Zirconia Thin Films M.F. Carolan;J.N. Michaels