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Creep and Densification During Sintering of Glass Powder Compacts
Author(s) -
RAHAMAN MOHAMED N.,
DE JONGHE LUTGARD C.,
SCHERER GEORGE W.,
BROOK RICHARD J.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04877.x
Subject(s) - creep , materials science , composite material , sintering , anisotropy , viscosity , stress (linguistics) , porosity , particle (ecology) , exponential function , optics , mathematical analysis , linguistics , philosophy , physics , oceanography , mathematics , geology
The simultaneous creep and densification of glass powder compacts was studied as a function of low applied uniaxial stress, temperature, and particle size. The creep rate can be expressed as the sum of the contribution from the applied stress that varies linearly with stress, and a contribution due to anisotropic densification that varies linearly with the densification rate. For a constant applied stress, the ratio of the creep rate to the densification rate is almost independent of both termperature and density. While these observations are consistent with the model of Scherer for the viscous sintering of glass, other observations show significant deviations from the model. Both the densification rate and the creep viscosity, which has an exponential dependence on porosity, show much stronger dependence on density compared with theoretical predictions.