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Initial Sintering of Alumina and Hematite
Author(s) -
COBLE R. L.
Publication year - 1958
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.1151-2916.1958.tb13519.x
Subject(s) - sintering , shrinkage , activation energy , materials science , diffusion , hematite , spheres , crystal (programming language) , mineralogy , composite material , crystallography , metallurgy , thermodynamics , chemistry , physics , astronomy , computer science , programming language
Experimental measurements of the rate of shrinkage of pressed Al 2 O 3 compacts, the neck growth between single‐crystal Al 2 O 3 spheres and plates, and the effect of particle size on neck growth between single‐crystal Al 2 O 3 spheres and plates are mutually consistent with the bulk diffusion sintering model. Tbe temperature dependence of the rate of shrinkage and neck growth in Al 2 O 3 is characterized by an activation energy of 165 kcal. per mole. Apparent diffusion coefficients and temperature dependence calculated from the shrinkage of pressed compacts of Fe 2 O 3 agree with measured diffusion coefficients for the diffusion of Fe in Fe 2 O 3 .