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Sintering Kinetics of Beryllia
Author(s) -
CLARE T. E.
Publication year - 1966
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.1151-2916.1966.tb15396.x
Subject(s) - sintering , kinetics , materials science , metallurgy , chemical engineering , mineralogy , chemistry , physics , engineering , quantum mechanics
Compacts of sulfate‐derived beryllia were sintered, for various times, in nitrogen at 1050° to 1500°C. The applicable equation for densification isThis is predicted by the Coble intermediate‐stage volume diffusion sintering model for material showing the observed (time) ½ dependence of grain size on time. Apparent diffusion coefficients for sintering are near those for oxygen diffusion in BeO but it is not possible to make a firm conclusion on the rate‐controlling ionic species. The activation energy for diffusion differs from that for grain growth; therefore the relation between porosity and grain size is not independent of temperature. Mathematical analysis shows that under certain conditions there may be an optimum temperature at which a required density can be attained with a minimum grain size.