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Activation Energies for Densification, Creep, and Grain‐Boundary Sliding in Nitrogen Ceramics
Author(s) -
Raj R.,
Morgan P. E. D.
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.tb10239.x
Subject(s) - materials science , creep , grain boundary , sublimation (psychology) , activation energy , ceramic , grain boundary sliding , thermodynamics , intergranular corrosion , composite material , chemistry , microstructure , psychology , physics , psychotherapist
The activation energies for densification, creep, and grain‐boundary sliding in HP‐Si 3 N 4 are consistent and large, approaching the heat of sublimation of Si 3 N 4 . If solution‐precipitation through the intergranular glass (or fluid) is invoked as a common underlying mechanism, then it can be concluded that the high activation energy results from the high heat of solution of the crystal into the glass. This is consistent with the finding that it is difficult to retain Si 3 N 4 in a glassy state.