Preparation and Characteristics of Ceramic Composite Powders Coated with $Al_2O_3$: (III) Composite Powders of $Al_2O_3-ZrO_2$

$Al_2O_3$로 피복시킨 세라믹 복합분체의 제조 및 특성: (III) $Al_2O_3-ZrO_2$ 복합분체

  • 현상훈 (연세대학교 세라믹공학과) ;
  • 이지현 (연세대학교 세라믹공학과) ;
  • 송원선 (연세대학교 세라믹공학과)
  • Published : 1992.08.01

Abstract

The alumina-zirconia composite powders of core particle ZrO2 coated with Al2O3 were prepared by the hydrolysis-deposition of the mixed aluminum salt solution of Al2(SO4)3-Al(NO3)3-Urea. The effects of hydrolysis reaction and coating parameters on characteristics of coated powders and composites were also investigated. The degree of coating could be estimated from the ratio of tetra-/mono-ZrO2 present at the room temperature after heat-treating coated powders at 120$0^{\circ}C$ and the result of TEM observations. When the content of ZrO2 in the dispersed coating system, the coating time, and the volume ratio of water/solution were 50 mg/g, 180 min, and 5, respectively the coating efficiency was maximum (the ratio of tetra-/mono-ZrO2 was 87/13). The relative densities of coated Al2O3-ZrO2 composites sintered at 1$650^{\circ}C$ for 4 hrs were about 91~98% and the maximum ratio of tetra-/mono-ZrO2 in Al2O3-20wt% ZrO2 composites was 62/38.

Keywords

References

  1. Nature v.258 Ceramic Steel R.C. Garvie;R.H. Hannink;R.T. Pascoe
  2. J.Am. Ceram. Soc. v.60 no.3-4 Mechanism of Toughening Partially Stabilized Zirconia D.L. Porter;A.H. Heuer
  3. J. Am. Ceram. Soc. v.61 no.1-2 Stress-Induced Transformation of Tetragonal ZrO₂Particles in Ceramic Matrices N. Claussen
  4. J. Korean Ceram. Soc. v.27 no.8 Perparation of Al₂O₃-ZrO₂ Composite Powders by the Use of Emulsion (Ⅳ). Emulsion-Spray Pyrolysis Method S.H. Hyun;D.J. Kim
  5. J. Am. Ceram. Soc. v.72 no.1 Low-Temperature Sintering of Seeded Sol-Gel Derived, ZrO₂-Toughened Al₂O₃ Composites G.L. Messing;M. Kumagai
  6. J. Am. Ceram. Soc. v.59 no.1-2 Fracture Toughening of Alumina with an Unstabilized ZrO₂Dispersed Phase N Claussen
  7. J. Mat Sci. v.24 Review Zirconia-Toughened Alumina (ZTA) Ceramics J.Wang;R. Stevens
  8. J. Am. Ceram. Soc. v.74 no.3 Consolidation of Alumina-Zirconia Mixtures by a Colloidal Process T. Kimura;Y. Kaneko;T. Yamaguchi
  9. J. Mater Sci. Lett. v.3 Microstructure and Performance of an Alumina-Zirconia Tool Bit R.C. Garvie
  10. J. Korean Ceram. Soc v.25 no.3 Perparation of Al₂O₃-ZrO₂Composite Powders by the Use of Emulsions:Ⅱ. Emulsion-Hot Kerosene Drying Method S.H. Hyun;J.G. Paik
  11. M.E. Thesis Perparation and Characteristics of Al₂O₃-ZrO₂ Composite Powders by the Emulsion-Hot Kerosene Method J.G. Paik
  12. J. Korean Ceram. Soc v.27 no.4 Preparation of Al₂O₃-ZrO₂ Composite Powders by the Use of Emulsions: Ⅲ. Emulsion-Coprecipitation Method S.H. Hyun;E.S. Kim
  13. J. Am. Ceram. Soc. v.67 no.6 Synthesis and Characterization of Monosized Doped TiO₂Powders B. Feglay;Jr;E.A. Barringer;H.K. Bowen
  14. Advaneced Ceramic Materials v.2 no.4 Preparation and Properties of Coated, Uniform, Inorganic Colloidal ParticleⅠ. Aluminum (Hydrous) Oxide on Hematite, Chromia, and Titania S. Kratohvil;E. Matijevic
  15. J. Korean Ceram. Soc. v.27 no.7 Preparation and Characteristics of Ceramic Composite Powders Coated with Al₂O₃:(Ⅰ) Hydrolysis of Mixed Aluminum Salt Solution for Coating S.H. Hyun;H.G. Jung
  16. J. Korean Ceram Soc. v.28 no.4 Preparation and Characteristics of Ceramic Composite Powders Coated with Al₂O₃:(Ⅱ) Composite Powders of Al₂O₃-TiO₂ S.H. Hyun;H.G. Jung
  17. J. Am. Ceram Soc. v.55 no.6 Phaase Analysis in Zirconia Systems R.C. Garvie;P.S. Nicholson
  18. J. Am. Ceram. Soc. v.67 no.3 Hindrance of Grain Growth in Al₂O₃by ZrO₂ Inclusion F.F. Lange;M.M. Hirlinger