Structural ceramics based on Si/sub 3/N/sub 4/--ZrO/sub 2/(+Y/sub 2/O/sub 3/) compositions
Journal Article
·
· J. Mat. Res.; (United States)
OSTI ID:6872362
An investigation was made of the effect of Y/sub 2/O/sub 3/ in solid solution in ZrO/sub 2/ on the phases that are formed when ZrO/sub 2/ is reacted with either N/sub 2/ or Si/sub 3/N/sub 4/. The results suggest that the Zr--oxynitride phase can be precluded as a reaction product when the Y/sub 2/O/sub 3/ content of the ZrO/sub 2/ is greater than or equal to 4 mol %. Dense Si/sub 3/N/sub 4//ZrO/sub 2/(+Y/sub 2/O/sub 3/) composites were fabricated, which did not degrade during oxidation at temperatures less than or equal to 1000 /sup 0/C. Severe degradation was observed for composites containing the Zr--oxynitride phase. The fracture toughness of the Si/sub 3/N/sub 4//ZrO/sub 2/(+Y/sub 2/O/sub 3/) composites increased with ZrO/sub 2/ content.
- Research Organization:
- Rockwell International Science Center, Structural Ceramics Group, 1049 Camino Dos Rios, Thousand Oaks, California 91360
- OSTI ID:
- 6872362
- Journal Information:
- J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 2:1; ISSN JMREE
- 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
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
DISPERSIONS
FAILURES
FRACTURE PROPERTIES
FRACTURES
MATERIALS
MECHANICAL PROPERTIES
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
POWDERS
SILICON COMPOUNDS
SILICON NITRIDES
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM NITRIDES
ZIRCONIUM OXIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
DISPERSIONS
FAILURES
FRACTURE PROPERTIES
FRACTURES
MATERIALS
MECHANICAL PROPERTIES
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
POWDERS
SILICON COMPOUNDS
SILICON NITRIDES
SOLID SOLUTIONS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM NITRIDES
ZIRCONIUM OXIDES