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End‐Point Density of Hot‐Pressed Alumina
Author(s) -
McCLELLAND J. D.,
ZEHMS E. H.
Publication year - 1963
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.1151-2916.1963.tb11680.x
Subject(s) - materials science , activation energy , atmospheric temperature range , shear stress , thermodynamics , relative density , stress (linguistics) , critical point (mathematics) , composite material , chemistry , sintering , physics , mathematical analysis , mathematics , linguistics , philosophy
Hot‐pressed aluminum oxide has been found to exhibit an asymptotic end‐point density. The temperature and pressure dependence of this end‐point density has been investigated over the range of temperature from 1100° to 1500°C and pressure from 500 to 6000 psi. The pressure dependence of the end‐point density can be explained in terms of a plastic‐flow model which exhibits a critical shear stress. The temperature dependence suggests that this critical shear stress is a thermally activated process with an activation energy of 39 kcal per mole.