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Modification of Sintering Kinetics by Solute Segregation in Al 2 O 3
Author(s) -
JORGENSEN P. J.
Publication year - 1965
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.1151-2916.1965.tb14714.x
Subject(s) - sintering , kinetics , materials science , grain growth , activation energy , diffusion , grain boundary diffusion coefficient , surface diffusion , grain size , metallurgy , effective diffusion coefficient , growth rate , surface energy , grain boundary , chemical engineering , thermodynamics , composite material , chemistry , microstructure , physics , quantum mechanics , engineering , medicine , geometry , mathematics , adsorption , radiology , magnetic resonance imaging
The segregation of MgO solute at grain boundaries in Al 2 O 3 controls the grain‐growth kinetics during sintering. In the initial stages of sintering where grain growth can be neglected, the MgO solute causes a decreased sintering rate by reducing the surface energy and/or the diffusion coefficient of the rate‐determining species. During the later stages of sintering, the segregated solute decreases the grain‐growth rate which dominates the sintering kinetics.