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Densification Mechanisms in High‐pressure Hot‐Pressing of HfB 2
Author(s) -
KALISH DAVID,
CLOUGHERTY EDWARD V.
Publication year - 1969
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.1151-2916.1969.tb12654.x
Subject(s) - materials science , hot pressing , activation energy , creep , consolidation (business) , pressing , grain boundary , metallurgy , composite material , microstructure , chemistry , business , accounting
The fabrication temperature was the principal variable in a kinetic study of the densification of hafnium diboride in high‐pressure hot‐pressing. Densification studies for conventional hot‐pressing were reviewed and correlated with the high‐pressure hot‐pressing results. The consolidation of HfB 2 in the open pore region during high‐pressure hot‐pressing is attributed to particle rearrangement caused by grain boundary sliding and fragmentation. The final stage of densification (relative density >90%) was analyzed in terms of the Nabarro‐Herring vacancy creep model. An activation energy of 22,900 cal/mole was obtained for the rate‐controlling step in the creep process.