Preparation of precursors for yttrium-containing advanced ceramics
This patent describes a process for extracting a blend of rare earths for components of a ceramics principally comprising at least one of zirconia or hafnium from a rare earth ore containing rare earth values and using the blend or rare earths in preparing a composite for use in fabrication of an ceramics containing oxides of the blend of rare earths. It comprises: feeding at least a portion of the rare earth ore to a fluidized bed chlorinator at 800{degrees}--1250{degrees}C to produce rare earth chlorides from the rare earth values contained in the ore; separating a blend of yttrium-depleted rare earth chlorides from yttrium chloride by-product, with the yttrium chloride by-product being separated by differential condensation from the blend of rare earth chlorides at 725{degrees}--1200{degrees}C; anhydrously reacting the separated blend of rare earth chlorides with at least one of alkoxide reactant selected from the group consisting of the alkali metal alkoxides to produce blend rare earth alkoxides and separating the blended rare earth alkoxides from reaction by-products and excess reagents; mixing the rare earth alkoxide with at least one of zirconium and hafnium alkoxide, to produce an alkoxide composite; and polymerizing and processing the composite into ceramic.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4902655; A
- Application Number:
- PPN: US 7-121012A
- OSTI ID:
- 6862448
- Resource Relation:
- Patent File Date: 16 Nov 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERAMICS
SYNTHESIS
CHLORINATION
HAFNIUM
ORE PROCESSING
OXIDES
POLYMERIZATION
PRECURSOR
PRODUCTION
RARE EARTH COMPOUNDS
RARE EARTHS
YTTRIUM OXIDES
ZIRCONIUM
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HALOGENATION
METALS
OXYGEN COMPOUNDS
PROCESSING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication