Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Study on the Preparation and Sinterability of MgO-Doped $Al_2O_3$ Powders by SprayPyrolysis Method

분무열분해법에 의한 MgO 첨가 $Al_2O_3$ 분체합성 및 소결성에 관한 연구

  • Published : 1990.04.01
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Abstract

Al2O3 and 0.25wt% MgO-doped Al2O3 powders were made from the alcohol solution of Al(NO3)3.9H2O and Mg(NO3)2.6H2O by spray pyrolysis method. Each powder was prepared at 900 and 100$0^{\circ}C$. Powders prepared at 90$0^{\circ}C$ were amorphous phase, but prepared at 100$0^{\circ}C$ wre mainly ${\gamma}$-Al2O3 crystalline form. Particle size of the MgO-doped Al2O3 powders was in the range of 0.2-2${\mu}{\textrm}{m}$, but undooped powders shwoed comparatively wider range of particle size. All the powders prepared at 900 and 100$0^{\circ}C$ were transformed to $\alpha$-Al2O3 crystalline form by calcination at 110$0^{\circ}C$ for 1hr. Each powder was sintered at 1600, 1650 and 1$700^{\circ}C$ for 2hrs. MgO-doped Al2O3 body sintering at 1$650^{\circ}C$ showed 99% of relative density but undooped Al2O3 showed 95% of relative density, even sintered at higher temperature of 1$700^{\circ}C$.

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References

  1. Am. Ceram. Soc. Bull. v.65 no.10 Homogeneous Y₂O₃-Stabilized ZrO₂Powder by Spray Pyrolysis Method H. Ishizawa;O. Sakurai;N. Mizutani;M. Kato
  2. J. Kor. Ceramic. Soc. v.25 no.4 A Study on the Preparation of MgO-Al₂O₃-SiO₂System Ceramic Powders by Spray Pyrolysis Method J.H. Park(et al.)
  3. J. Powder and Powder Metallurgy v.24 no.8 Fine Powders by Spray-Pyrolysis Technique Ⅱ. Iron Oxide Powders A. Kato;F. Tokunaga
  4. Science of Ceramics v.12 Characteristics of EDS-derived Powders G.L. Messing;T.J. Gardner;R.R. Ciminelli;P Vincenzinie(ed.)
  5. J. Am. Ceram.Soc. v.68 no.5 Segregation of Mg to the (0001) Surface of Doped Sapphire S. Baik;D.E. Fowler;J.M. Blakely;R. Raj
  6. J. Am. Ceram.Soc. v.69 no.2 Effect of MgO Solute on Microstructure Development in Alumina K.A. Berry;M.P. Harmer
  7. J. Am. Ceram.Soc. v.69 no.2 Structure and Grain Coarsening during the Sintering of Alumina N.J. Shaw;R.J. Brook
  8. J. Am. Ceram.Soc. v.70 no.5 Effect of Liquid Phase on the Morphology of Grain Growth in Alumina Wolfgang A. Kaysser;Marianne Sprissler
  9. J. Am. Ceram.Soc. v.63 no.5;6 Grain Boundary Segregation in an MgO-Doped Alumina D.R. Clarke
  10. J. Am. Ceram.Soc. v.48 no.4 Modification of Sintering Kinetics by Solute Segregation in Alumina P.J. Jorgensen
  11. J. Am. Ceram.Soc. v.47 no.7 Role of Solute Segregation at Grain Boundaries During Final Stage Sintering of Alumina P.J. Jorgensen;J.H. Westbrook
  12. J. Am. Ceram.Soc. v.61 no.4;5 A Test of the Second Phase and Impurity Segregation Models for MgO Entanced Densification of Sintered Alumina W.C. Jhonson;R.J. Coble
  13. J. Am. Ceram.Soc. v.71 no.12 Pore Evolution during Glow Discharge Sintering of Alumina Richard A Page;Stephen Spooner;Wayne B. Sanderson
  14. J. Am. Ceram.Soc. v.71 no.6 Grain-Boundaries in Fine-Grained Magnesium-Doped Aluminas Sylvie Lartigue;Louisette Priester
  15. J. Am. Ceram.Soc. v.66 Effect of MgO Solute on Kinetics of Grain Growth in Al₂O₃ Stephen J. Bennison;Martin P. Harmer
  16. J. Am. Mat. Sci. v.15 The Effect of MgO Additions on the Kinetics of Hot Pressing in Alumina M.P. Harmer;R.J. Brook
  17. Introduction to Colloid and Surface Chemistry(Third Edition) D.J. Shaw
  18. Trans. Soc. Mech. Eng. v.4;5 S. Nukiyama;Y. Tanasawa
  19. Introduction to Ceramics W.D. Kingery;H.K. Bowen;D.R. Uhlman