Advertisement

Hydrostatic Compaction of Fine Cobalt Powder

  • D. Dužević
  • M. Buchberger

Abstract

During the past few decades, a large number of analytical equations have attempted to describe the densification of powders under pressure. A pertinent review of the subject is available in the recent paper published by Chaklader and Bhattacharya.1 The majority of the empirical relations between the applied pressure and the corresponding green-compact volume (density) has been designed to fit the data obtained by the uniaxial technique of die-pressing, which suffers from serious inconsistencies. The most striking one is the die-wall friction with all of the accompanying anisotropies and inhomogeneities. A great deal of these incongruities, as well as their masking effects, can be avoided by applying the isostatic pressing technique. Basically, the same pressing equations should fit the data obtained from both isostatic and die-pressing experiments. Actually, on the basis of Morgan and Sand’s experiments, Lenel2 points out that Heckel’s (or Konopicky’s or Athy’s) equation is the most suitable to describe the phenomenon of isostatic powder densification. According to Mitin,3 a kind of inverse power law equation named after Zhdanowitsch, fairly describes the process. With all the well known limitations of the simple potentional, logarithmic or exponential equations, such a theory does not appear tenable. The goal of this paper is, therefore, to test the interpolating suitability of the empirical pressing equations by treating the experimental data of our own.

Keywords

Ceramic Powder Pressing Equation Particle Rearrangement Distribution Term Cobalt Powder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. C. D. Chaklader and S. K. Bhattacharya, Effect of Additives on the Cold Compaction Behaviour of SiC powder, in “Sintering ‘85”, G. C. Kuczynski et al., eds., Plenum Press, New York and London (1987).Google Scholar
  2. 2.
    F. V. Lenel, “Powder Mretallurgy”, MPIF, Princeton (1980).Google Scholar
  3. 3.
    B. S. Mitin, “Poroskovaya metallurgya i napilennie pokritiya”, Metallurgiya, Moskva (1987).Google Scholar
  4. 4.
    C. E. Van Buren and H. H. Hirsch, Hydrostatic Pressing of Powders, in H. H. Hausner et al., eds., “New Methods of Consolidation of Metal Powders”, Plenum Press, New York (1967).Google Scholar
  5. A. R. Cooper and L. E. Eaton, Compaction Behaviour of Several Ceramic Powders, J. Am. Ceram Soc.45:97 (1962).Google Scholar

Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • D. Dužević
    • 1
  • M. Buchberger
    • 1
  1. 1.Bastijanova bbRade Končar — Electrotechnical InstituteZagrebYugoslavia

Personalised recommendations