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Isostatic Hot‐Pressing of UO 2
Author(s) -
SOLOMON A. A.,
COCHRAN K. M.,
HABERMEYER J. A.
Publication year - 1981
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.1151-2916.1981.tb09900.x
Subject(s) - hot isostatic pressing , pressing , hot pressing , materials science , grain size , grain growth , creep , activation energy , swelling , radius , diffusion , composite material , mineralogy , sintering , thermodynamics , chemistry , physics , computer security , computer science
Final‐stage isostatic hot‐pressing of nearly stoichiometric UO 2 was investigated. The rate of hot‐pressing is linearly dependent on the pressure driving force F=P+(2γ/r)—p , where P and p are the external and internal pressures, respectively, γ the average surface energy, and r average pore radius. The apparent activation energy for hot‐pressing agrees with that for U bulk diffusion. Grain growth during hot‐pressing follows d∝t n , where d is the grain diameter, t is time, and n =0.2. Grain size is also a function of temperature at constant density. The results indicate that Nabarro‐Herring creep is the controlling mechanism of hot‐pressing over the range of variables investigated, although the applicability of this model is questioned. The results also show that sintered UO 2 can entrap gas that can lead to swelling.