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High temperature failure mechanisms in ceramic polycrystals

Conference ·
OSTI ID:5277403
;
The high temperature failure of ceramics has been observed to occur by the nucleation, growth and coalescence of cracks. Each process involves diffusive cavity nucleation and growth, either within a damage zone or at microstructural heterogeneities. The specific cavitation and cracking mechanisms pertinent to ceramics are described and available models are presented. Particular emphasis is placed on continuous crack nucleation at microstructural heterogeneities and the crack coalescence process that causes eventual failure. Failure time data are also reviewed and correlated with models.
Research Organization:
Lawrence Berkeley Lab., CA (USA)
DOE Contract Number:
AC03-76SF00098
OSTI ID:
5277403
Report Number(s):
LBL-16192; CONF-8404103-1; ON: DE84006641
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CAVITATION
CERAMICS
CHALCOGENIDES
CRACK PROPAGATION
CRYSTALS
FAILURES
NITRIDES
NITROGEN COMPOUNDS
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
POLYCRYSTALS
SILICON COMPOUNDS
SILICON NITRIDES