Method for preventing low-temperature degradation of tetragonal zirconia containing materials
Patent
·
OSTI ID:5374744
The patent describes a process for preparing a ceramic body having a surface region that consists essentially of tetragonal zirconia and is partially stabilized with yttria and mixtures thereof with ceria. It comprises the steps of: sintering the body to at least 95% theoretical density at a temperature below about 1550{sup 0}C.; abrading a portion of the surface region to impart strain and deformation thereto; and heating treating the surface region to recrystallize thereon tetragonal strain free grains of yttrium oxide zirconium oxide, the content of yttrium on the surface region being the same as the average content of yttrium in the ceramic body, such that the surface region is covered with a thin layer consisting solely of tetragonal grains.
- Assignee:
- Allied Signal Inc., Morris Township, Morris County, NJ
- Patent Number(s):
- US 4853353
- Application Number:
- PPN: US 7-148726A
- OSTI ID:
- 5374744
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CERAMICS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
FABRICATION
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERING
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CERAMICS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
FABRICATION
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERING
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES