Please use this identifier to cite or link to this item: doi:10.22028/D291-23989
Title: The influence of an increasing particle coordination on the densification of spherical powders
Author(s): Arzt, Eduard
Language: English
Year of Publication: 1982
OPUS Source: Acta metallurgica. - 30. 1982, 10, S. 1883-1890
SWD key words: Einfluss
Isostatisches Pressen
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: The densification of spherical powders by cold compaction, hot-isostatic pressing and sintering can be described in terms of the shrinkage of the Voronoi cells associated lith the initial packing of the powder particles. The shape of the average cell is determined by the radial distribution function of a "random dense" packing of spheres. The advantage of this approach lies in its ability to explain luantitatively the continuous formation of new neighbours (increase in particle coordination'). Using simple constitutive relations for low temperature plasticity, diffusion, and power-lal creep, the effects of an increasing coordination on densification by these mechanisms are assessed. The results show that in pressing operations, with negligible contribution from diffusion, densification becomes increasingly more difficult than would be expected on the basis of constant coordination; that in sintering, on the other hand, densification rates are underestimated by two-sphere models.
Link to this record: urn:nbn:de:bsz:291-scidok-20053
Date of registration: 30-Jan-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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