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Effect of Heating Rate on Sintering and Coarsening
Author(s) -
Chu MayYing,
Rahaman Mohamed N.,
Jonghe Lutgard C.,
Brook Richard J.
Publication year - 1991
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.1151-2916.1991.tb04090.x
Subject(s) - sintering , materials science , atmospheric temperature range , relative density , range (aeronautics) , constant (computer programming) , zinc , thermodynamics , composite material , mineralogy , analytical chemistry (journal) , metallurgy , chemistry , chromatography , physics , computer science , programming language
The sintering of zinc oxide powder compacts has been investigated at constant rates of heating of 0.5° to 15°C/min. For samples with the same initial relative density (0.50), the temperature derivative of the densification strain versus density fits within a single, relatively narrow band. At low temperatures the densification rate as a function of temperature increases almost linearly with the heating rate. The data, covering a wide density range of 0.5 to 0.98, are consistent with an analysis that accounts for the coarsening (defined as an increase in the mean pore separation) in terms of two classes of microstructural coarsening processes: those associated with densifying and with nondensifying mechanisms.