Yttrium oxide stabilized zirconium oxide
This patent describes a process comprising: (a) forming a solution by mixing yttrium hydroxide and a sufficient amount of an aqueous solution of acetic acid to dissolve the yttrium hydroxide. The solution has a concentration of yttrium ion of about 5% to about 20% by weight of the solution, (b) adding from about 80% to about 95% by weight of zirconium oxide having a particle size range from about 1 to about 5 microns to yield a Zr to Y weight ratio of from about 4:1 to about 19:1 and thereby forming a slurry, (c) spray drying the slurry to form spherical agglomerates consisting essentially of zirconium oxide and a relatively uniform distribution of yttrium acetate whereby the agglomerates have a size from about 20 to about 200 micrometers, (d) heating the agglomerates to about 600/sup 0/C to about 700/sup 0/C in a neutral or oxidizing atmosphere to convert yttrium acetate to yttrium oxide to thereby form zirconium oxide yttrium oxide agglomerates with about 5% to about 20% by weight of yttrium oxide.
- Assignee:
- GTE Products Corp., Stamford, CT
- Patent Number(s):
- US 4695439
- Application Number:
- TRN: 87-040529
- OSTI ID:
- 5815389
- Resource Relation:
- Patent File Date: Filed date 25 Sep 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ZIRCONIUM OXIDES
STABILIZATION
ACETATES
ACETIC ACID
ACIDIFICATION
ADDITIVES
AGGLOMERATION
AQUEOUS SOLUTIONS
CHEMICAL REACTION YIELD
DISSOLUTION
HIGH TEMPERATURE
MIXING
MOLECULAR WEIGHT
QUANTITY RATIO
SLURRIES
SPRAY DRYING
STABILITY
YTTRIUM HYDROXIDES
YTTRIUM OXIDES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHALCOGENIDES
DISPERSIONS
DRYING
HYDROGEN COMPOUNDS
HYDROXIDES
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SOLUTIONS
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
YIELDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties