Pressureless sintered sialons with low amounts of sintering aid. [Si/sub 2/ /sub 6/Al/sub 0/ /sup 3//sub 93/Y/sub 0/ /sub 007/O/sub 0/ /sub 4/N/sub 36/ and Si/sub 2/ /sub 6/Al/sub 0/ /sub 384/ O/sub 0/ /sub 4/N/sub 33/ /sub 0/]
Technical Report
·
OSTI ID:6348318
Two ..beta..' - Sialons of composition Si/sub 2/./sub 6/Al/sub 0/ /sub 393/Y/sub 0/./sub 007/O/sub 0/ /sub 4/N/sub 3/ /sub 6/ and Si/sub 26/Al/sub 0/ /sub 384/Y/sub 0/ /sub 014/O/sub 0/ /sub 4/N/sub 3/ /sub 6/ were pressureless sintered from mixtures of Y/sub 2/O/sub 3/ and separately milled ..beta.. -Si/sub 3/N/sub 4/, AlN, and SiO/sub 2/. These sialons had densities of over 98% of theoretical, four-point bend strengths of 460 and 155 MPa at room temperature and 1400 C, respectively, and 1400 C oxidation rates lower than those reported for hot pressed Si/sub 3/N/sub 4/ and for a stronger sialon with 2.5 weight percentage Y/sub 2/O/sub 3/.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 6348318
- Report Number(s):
- N-78-25215; NASA-TP-1246; E-9522; TRN: 79-007878
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
FLEXURAL STRENGTH
OXIDATION
SINTERING
SILICON NITRIDES
SILICON OXIDES
YTTRIUM OXIDES
DENSITY
MEDIUM TEMPERATURE
VERY HIGH TEMPERATURE
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
FABRICATION
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion
ALUMINIUM NITRIDES
FLEXURAL STRENGTH
OXIDATION
SINTERING
SILICON NITRIDES
SILICON OXIDES
YTTRIUM OXIDES
DENSITY
MEDIUM TEMPERATURE
VERY HIGH TEMPERATURE
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
FABRICATION
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion