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Surface tension and the sintering force in copper

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Abstract

The sintering force, defined as the uniaxial tensile force necessary to just stop the sintering contraction in the direction of the applied force, has been measured over the entire course of the sintering of an uncompacted copper powder. The force rises to a maximum at a den-sity of 95 pct, and then becomes immeasurable. The sintering force perpendicular to cross-section “a” of a sinter body can also be computed from the known surface tension γ of the metal, the average mean curvature ¯H of the surface of the porosity and the area fraction of porosityA A , by use of the relationship:F = γ¯HA A a. The calculated sintering force is valid so long as the metal-void interface is composed of a multiply-connected minimal-area sur-face. This condition is met during late first stage and early second stage sintering. Under the same conditions, the surface tension of a sinterable solid can be determined through a measurement of the sintering force.

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Authors and Affiliations

  1. Savannah River Laboratory, E. I. duPont de Nemours Company, 29801, Aiken, S.C.

    R. A. Gregg (Research Supervisor)

  2. Department of Metallurgical and Materials Engineering, University of Florida, Gainesville, Fla.

    F. N. Rhines (Chairman)

Authors
  1. R. A. Gregg
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  2. F. N. Rhines
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Gregg, R.A., Rhines, F.N. Surface tension and the sintering force in copper. Metall Trans 4, 1365–1374 (1973). https://doi.org/10.1007/BF02644534

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  • DOI: https://doi.org/10.1007/BF02644534

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