Mechanical properties and microstructure of Si sub 3 N sub 4 - whisker-reinforced Si sub 3 N sub 4 matrix composite
Conference
·
OSTI ID:5123916
Room-temperature elastic modulus, hardness, flexural strength and fracture toughness of Si{sub 3}N{sub 4}-whisker-reinforced Si{sub 3}N{sub 4} matrix composite with up to 35 vol.% of whisker were measured and correlated with microstructures. Both SEM and TEM were used for structural characterization. The toughness of the composite was observed to increase from 6.5 MPa{radical}m to 8.8 MPa{radical}m with addition of 5 vol.% Si{sub 3}N{sub 4} whisker. This represents a 1.4-fold increase in toughness. Correspondingly, the strength increased from 673 to 802 MPa. The toughness and strength behavior of the composites is believed to be controlled by the whisker strengthening and matrix grain size.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5123916
- Report Number(s):
- CONF-900160-1; ON: DE90005651
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
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· Journal of the American Ceramic Society; (United States)
·
OSTI ID:6346243
Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
CRYSTALS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
GRAIN SIZE
HARDNESS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
WHISKERS
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
CRYSTALS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
GRAIN SIZE
HARDNESS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SIZE
WHISKERS