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Sintering and random structures
Author(s) -
Lacour C.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220960235
Subject(s) - sintering , porosity , materials science , diffusion , percolation (cognitive psychology) , volume (thermodynamics) , creep , particle (ecology) , statistical physics , percolation threshold , mechanics , thermodynamics , composite material , physics , geology , oceanography , quantum mechanics , neuroscience , biology , electrical resistivity and conductivity
Abstract It is shown that the initial state of a compressed powder, as a rule complex and unorganized, actually obeys the statistics laws which inspired the percolation. This makes it possible to calculate all the elements of the dimensional distribution of the interparticulate spaces of a compact powder, of which only the total porosity, volume, and mean particle size are known. The evolution of these distributions during sintering is then investigated in the case of a volume diffusion mechanism and in the case of creep. An essential practical implication emerges from this study: to arrive at the theoretical density of a material in which sintering is governed by a volume diffusion, it is far more important to destroy the initial structure of the compact by reducing the dimensions of the larger voids, even if this increases the number of smaller voids, than to lower the initial porosity globally.