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Verification of the fracture mechanism of β″‐aluminas caused by large current density
Author(s) -
Ohshima Masaaki,
Kobayashi Akira,
Yoshida Akihiko,
Tsuji Hiromochi
Publication year - 1991
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391110502
Subject(s) - materials science , sodium , ion , current density , fracture (geology) , current (fluid) , electrolyte , stress (linguistics) , composite material , thermal , fast ion conductor , mechanism (biology) , thermodynamics , metallurgy , chemistry , electrode , physics , linguistics , philosophy , organic chemistry , quantum mechanics
β″‐aluminas which transmit sodium ions and do not conduct electrons are expected to be applied in practice for solid electrolytes and separators in sodium‐sulfur batteries. It is known that a large sodium ion current density fractures β″‐aluminas instantly. To clarify this fracture mechanism, the temperature and thermal stress distributions in a β″‐alumina tube generated by transmitting sodium ions were calculated. Then using β″‐alumina tubes, experiments were carried out in which β″‐alumina were cracked by a large current density. The values of thermal stress in these experiments wre solved using upper calculation. These values were almost equal to those of the mechanical strength of β″‐aluminas. The fracture mechanism of β″‐aluminas by transmission of a large sodium ion current density is thermal stress generated by Joule loss in β″‐aluminas.