SiAlON ceramic compositions and methods of fabrication

Patent · Tue May 31 00:00:00 EDT 1994

OSTI ID:7037464

O'Brien, M H; Park, B H

A method of fabricating a SiAlON ceramic body includes: (a) combining quantities of Si[sub 3]N[sub 4], Al[sub 2]O[sub 3] and CeO[sub 2] to produce a mixture; (b) forming the mixture into a desired body shape; (c) heating the body to a densification temperature of from about 1,550 C to about 1,850 C; (d) maintaining the body at the densification temperature for a period of time effective to densify the body; (e) cooling the densified body to a devitrification temperature of from about 1,200 C to about 1,400 C; and (f) maintaining the densified body at the devitrification temperature for a period of time effective to produce a [beta][prime]-SiAlON crystalline phase in the body having elemental or compound form Ce incorporated in the [beta][prime]-SiAlON crystalline phase. Further, a SiAlON ceramic body comprises: (a) an amorphous phase; and (b) a crystalline phase, the crystalline phase comprising [beta][prime]-SiAlON having lattice substituted elemental or compound form Ce.

• DOE Contract Number: AC07-76ID01570
• Assignee: EG G Idaho, Inc., Idaho Falls, ID (United States)
• Patent Number(s): US 5316988; A
• Application Number: PPN: US 8-100888
• OSTI ID: 7037464
• Resource Relation: Patent File Date: 2 Aug 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
FABRICATION
SILICON NITRIDES
CERIUM OXIDES
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DENSITY
MIXTURES
PHASE STUDIES
ALUMINIUM COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
DISPERSIONS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication