Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Preparation of $Al_2O_3$-$ZrO_2$ Composite Powders by the Use of Emulsions : III. Emulsion-Coprecipitation Method

에멀젼을 이용한 $Al_2O_3$-$ZrO_2$복합분체의 제조 : III. 에멀젼-공침법

  • 현상훈 (연세대학교 요업공학과) ;
  • 김의수 (연세대학교 요업공학과)
  • Published : 1990.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

$Al_2O_3$-20w/o $ZrO_2$ composite powders were prepared by the emulsion-coprecipitation method and the effects of preparative conditions on powder characteristics were investigated. In the preparation of $Al_2O_3$-$ZrO_2$ composite powders, toluene was used instead of kerosene as the oil phase in emulsions. After coprecipitation, the emulsion was easily broken into a single liquid phase by adding methanol, and then precipitates could be effectively collected by filteration. The fact that all $ZrO_2$ phases present at room temperature in composite powders calcined at $1100^{\circ}C$ after washed by methanol had a tetragonal structure confirmed that methanol-washing enhanced the dispersibility of fine $ZrO_2$ particles in $Al_2O_3$ matrix. $Al_2O_3$-$ZrO_2$ composite powders were spherical particles of 0.2${\mu}{\textrm}{m}$ diameter. Pellets sintered at $1650^{\circ}C$ for 2hrs showed the relative theoretical density of 97.3% and the fracture toughness of 5.01MN/$m^{3/2}$.

Keywords

References

  1. Am. Ceram. Soc. Bull. v.60 no.2 Nonconventional Powder Preparation Techiques D.W. Johnson Jr.
  2. J. Korean Ceramic Soc. v.24 no.6 Preparation of Al₂O₃-ZrO₂Composite Powders by the Use of Emulsions; I. Thermodynamic Model of the Emulsion Stability S.H. Hyun;J.G. Paik;S.R. Song
  3. J. Korean Ceramic Soc. v.25 no.3 Preparation of Al₂O₃-ZrO₂Composite Powders by the Use of Emulsions Ⅱ. Emulsion-Hot Kerosene Drying Method S.H. Hyun;J.G. Paik
  4. Advances in Ceramics;Cermaic Powder Science v.21 Preparation of Yttria Powders by Emulsion Precipitation M. Akinc;A. Cellikkaya;G.L. Messing(et al. ed.)
  5. Advances in Ceramics;Cermaic Powder Science Preparation of 2ZrO₂·Yb₂O₃by Emulsion Techniques Tsuneyuki Kanai;W.E. Rhine;H.K. Bowen
  6. Encyclopedia of Emulsion Technology;Application v.2 Paul Beacher(Ed.)
  7. AIChE Journal v.20 no.3 Effect of Phase-Volume Ratio and Phase-Inversion on Viscosity of Microemulsions and Liquid Crystals J.W. Falco;R.D. Walker, Jr.;D.O. Shah
  8. J. Am. Ceram.Soc. v.55 no.6 Phase Analysis in Zirconia Systems R.C. Garive;P.S. Nicholson
  9. J. Am. Ceram.Soc. v.59 no.7;8 Fracture Toughness Determination by Indentation A.G. Evans;E.A. Charles
  10. Advanced Ceramic Materials v.3 no.2 Techniques for Agglomeration Control During Wet-Chemical Powders Synthesis Andreas Roosen;Hans Hausner
  11. M.E. Theis Preparartion and Characteristics of Al₂O₃-ZrO₂Composite Powders by the Emulsion-Kerosene Drying Method J.G. Paik
  12. J. Mat. Sci. v.17 no.1 Transformation of Toughening F.F. Lange