Properties of Alumina Powder Prepared by Precipitation Method (III) : Sintering Behavior

침전법으로 제조한 Alumina 분말의 특성(III) : 소결거동

  • 홍기곤 (연세대학교 공과대학 요업공학과) ;
  • 이홍림 (연세대학교 공과대학 요업공학과)
  • Published : 1988.05.01

Abstract

Alpha alumina powder with fine particle size and narrow particle size distribution was prepared by precipitation method using Al2(SO4)3.18H2O as a starting material. The alpha alumina powder was prepared by calcining aluminum hydroxide which was formed under various pH values. The sinterabilityof alpha alumina powder and the effect of MgO on the sinterability of alpha alumina powder were investigated. The sinterability of alpha alumina powder was the order of pH=10≒pH11>pH=7≒pH9, and alpha alumina obtained from boehmite which was prepared by precipitation method reached to 97.5% of theoretcal density by the pressureless sintering. The effect of MgO on volume shrinkage of alumina was very slight in the initial sintering stage but remarkable in the final sintering stage. It was also found that MgO controlled effectively the grain growth of alumina.

Keywords

References

  1. Trans. Br. Ceram. Soc v.78 no.5 Rapid Sintering of Pure and Doped α-Al₂O₃ M. P. Harmer(et al.)
  2. J. Kor. Ceram. Soc. v.25 no.3 Properties of Alumina Powder Prepared by Precipitation Method(Ⅱ) : Properities of Alumina Powder on Heat-Treatment G. G. Hong;H L Lee
  3. J. Am. Ceram. Soc. v.41 no.2 Initial Sintering of Alumina and Hematite R. L. Coble
  4. J. Am. Ceram. Soc. v.69 no.2 Effect of MgO Solute on Microstructure Developement in Al₂O₃ K. A. Berry;M. P. Harmer
  5. Proc. Br. Ceram. Soc. v.32 Fabrication Principles for the Production of Ceramics with Superior Mechanical Properties R. J. Brook
  6. Mater. Sci. Res. v.10 Influence of MgO on the Evolution of the Microstructure of Al₂O₃ J. G. J. Pellen
  7. J. Mat. Sci. v.11 The Machanism of Simultaneous Sintering and Phase Transformation in Alumina P A. Badkar(et al.)
  8. Am. Ceram. Soc. Sintering of Al₂O₃, in Alumina as A Ceramic Meterial Walter H. Gitzen
  9. Ceramic Processing before Firing Structure and Properties of Agglomerates D. E. Niesz(et al.)
  10. J. Am. Ceram. Soc. v.68 no.5 Segregation of MgO to the (0001) Surface of Doped Sapphire S. Baik(et al.)
  11. J. Kor. Ceram. Soc v.25 no.2 Properties of Alumina Powder Prepared by Precipitation Method(Ⅰ) : Aluminum Hydrate G. G. Hong;H. L Lee
  12. J. Jpn. Powder Metall v.26 no.7 Sintering Behavior and Powder Characteristicis, Ⅱ. Sintering Behavior of α-Fe₂O₃Powders T. Nomura(et al.)
  13. J. Appl. Phys v.26 no.10 Study of the Initial Stages of Sintering Solids by Viscous Flow, Evaporation-Condensation, and Self-Diffusion W. D. Kingery(et al.)