Densification of Aggregated Alumina Powder under Cyclin Compaction

반복압축하의 응집된 알루미나 분말의 치밀화

  • Kim, K.T. (Department of Mechanical Engineering, Pohang Institue of Science and Technology) ;
  • Son, G.S. (Department of Mechanical Engineering, Pohang Institue of Science and Technology) ;
  • Suh, J. (Department of Mechanical Engineering, Pohang Institue of Science and Technology)
  • 김기태 (포항공과대학 기계공학과) ;
  • 손건석 (포항공과대학 기계공학과) ;
  • 서정 (포항공과대학 기계공학과)
  • Published : 1992.02.01

Abstract

The effects of cyclic stress, frequency and bias-pressure on densification of Al2O3 powder cyclic compaction are investigated. The effect of frequency was not significant on densification of Al2O3 powder under cyclic compaction. The higher the cyclic stress and the lower the bias pressure, the higher densification was achieved. To obtain a higher densification, cyclic compaction was more efficient than 1 stroke compaction. A densification equation was proposed to describe an cyclic time dependent pressure-volume relation for Al2O3 powder under cyclic compaction. This equation was obtained empirically, based on the pressure-volume equation proposed by Cooper and Eaton, the time dependent densification equation by Kim and Suh and experimental data for Al2O3 powder under cyclic compaction. The agreement between the proposed equation and experimental data for Al2O3 powder under cyclic compaction was very good.

Keywords

References

  1. ibid v.98 Forming of Ceramic Powders by Cyclic-CIP-Effect of Bias Pressure T. Nishimura;K. Jimbo;Y. Matsuo;S. Kimura
  2. Powder Metall. v.33 Model for Hot Compaction of Metal Powders K.T. Kim.;J. Suh
  3. ibid v.48 Model for Compaction of Ceramic Powders E.G. Schwartz;A.S. Weinstein
  4. ibid v.98 Forming of Ceramic Powders by Cyclic-CIP-Effect of Frequency T. Nishimura;K Kubo;K. Jinbo;Y. Matsuo;S. Kimura
  5. J. Am. Ceram. Soc. v.45 Compaction Behavior of Several Ceramic Powders A.R. Cooper, Jr.;L.E. Eaton
  6. Brit Ceram Proc. v.38 Vibratory Assistance to the Pressing of Ceramic Powders Boch;B. Rogeaux
  7. ibid v.60 Mechanics of Powder Pressing : Ⅱ Finite-Element Analysis of End-Capping in Pressed Green Powders R.A. Thompson
  8. Noyes Data Cordration Advanced Processing of Ceramw Compounds W.L. Frankhouser
  9. Springer-Verlag E. Dorre;H Hubner;Alumina;B Ilschner(ed.);NJ. Grant(ed.)
  10. ibid v.67 Compaction Behavior of Spray Dried Alumina R.G. Frey;J.W. Halloran
  11. J Ceram Soc Japan v.95 Development of Cyclic-CIP and its Application to Powder Forming Y Matsuo;T. Nishimura;K. Jinho;K. Yasupa;S. Kimura
  12. Am. Ceram. Soc Bull v.60 Mechanics of Powder Pressing : I, Model for Powder Densification R.A. Thompson
  13. BMDP Statistical Software Manual W.J. Dixon(ed.)
  14. J Am Ceram. Soc. v.38 Vibratory Compacting of Metal and Ceramic Powders W.C. Bell;R D. Dillender;H.R. Lominac;E.G. Manning
  15. J Am. Ceram. Soc. v.66 Stress Transmission During Compaction of a Spray-Dired Alumina Powder in a Steel Die R.A. Dimiha;J.S. Reed
  16. J. Am. Ceram. Soc. v.48 Strength-Grain Size-Porosity Relations in Alumina E.M. Passmore;R.M. Spriggs;T. Vasilos