Influence of the Si3N4 microstructure on its R-curve and fatigue behavior
Conference
·
· Ceramic Engineering and Science Proceedings; (United States)
OSTI ID:6075834
The R-curve and fatigue behavior of a silicon nitride with large, highly elongated grains were compared to those of a silicon nitride with smaller, more equiaxed grains. The former was found to have higher toughness and a slightly rising R-curve which enhanced fatigue resistance, while the latter had constant toughness with crack length. The R-curve was attributed to crack deflection and grain pull-out. The microstructure did not influence the dynamic fatigue properties of the two ceramics, as both had good resistance to dynamic fatigue. The cyclic fatigue resistance of the large-grained Si3N4, however, was surprisingly low. 6 refs.
- OSTI ID:
- 6075834
- Report Number(s):
- CONF-910162--
- Conference Information:
- Journal Name: Ceramic Engineering and Science Proceedings; (United States) Journal Volume: 12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRYSTAL STRUCTURE
EVALUATION
FATIGUE
FRACTURE PROPERTIES
GRAIN SIZE
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRYSTAL STRUCTURE
EVALUATION
FATIGUE
FRACTURE PROPERTIES
GRAIN SIZE
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE