Method for sintering high density yttria gadolinia ceramic scintillators
A method for preparing high density yttria-gadolinia ceramic scintillators by cold-pressing multicomponent powder to form powder compacts and then sintering the compacts to form transparent-to-translucent ceramic scintillator bodies. The powder compacts are formed by either die pressing or die pressing followed by isostatic pressing to further increase green density. The powder compacts are sintered in vacuum or a reducing atmosphere at a temperature of between 1800/sup 0/ C. and 2100/sup 0/ C. The preferred heating sequence includes a holding period at a temperature lower than the final sintering temperature. The finished scintillator includes Y/sub 2/O/sub 3/, Gd/sub 2/O/sub 3/, and one or more of Eu/sub 2/O/sub 3/, Nd/sub 2/O/sub 3/, Yb/sub 2/O/sub 3/, Dy/sub 2/O/sub 3/, Pr/sub 2/O/sub 3/, and Tb/sub 2/O/sub 3/ rare earth activator oxides. At least one of the oxides of elements Zr, Th, and Ta is included as a transparency promoting densifying agent. At least one of CaO and SrO may be included as a light output restorer.
- Assignee:
- General Electric Company
- Patent Number(s):
- US 4518545
- Application Number:
- TRN: 85-027037
- OSTI ID:
- 6435787
- Resource Relation:
- Patent File Date: Filed date 18 Jun 1982; Other Information: PAT-APPL-389829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
GADOLINIUM OXIDES
COLD PRESSING
OPACITY
SINTERING
SCINTILLATION COUNTERS
CERAMICS
YTTRIUM OXIDES
ADDITIVES
CALCIUM OXIDES
COLOR
DENSITY
DYSPROSIUM OXIDES
EUROPIUM OXIDES
NEODYMIUM OXIDES
POWDERS
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
VERY HIGH TEMPERATURE
YTTERBIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
DYSPROSIUM COMPOUNDS
EUROPIUM COMPOUNDS
FABRICATION
GADOLINIUM COMPOUNDS
MATERIALS WORKING
MEASURING INSTRUMENTS
NEODYMIUM COMPOUNDS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRESSING
RADIATION DETECTORS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM COMPOUNDS
YTTRIUM COMPOUNDS
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication