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US 5,352,642 AGranted
Fabrication of Y.sub.3 Al.sub.5 O.sub.12 fibers from water soluble polymers
AssigneeThe Babcock & Wilcox Company
InventorsSung S. Pak, R. Allen Kimel
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Abstract
A method for fabricating Y.sub.3 Al.sub.5 O.sub.12 (YAG) fibers from water soluble polymers includes a pre-YAG polymer synthesis, with solution viscosity adjustment followed by fiber spinning and heat treatment. The polymer synthesis employs polar solvents such as water or alcohol with a carboxylic acid containing at least two carboxyl groups.
Claims18
A method for making an yttrium-aluminum water soluble polymer, comprising the steps of:
- mixing an yttrium salt with an aluminum salt in an yttrium to aluminum molar ratio of about 3 to 5;
- adding said yttrium and aluminum salt mixture to a solution containing a polar solvent and an acid having at least two carboxyl groups;
- and
- refluxing said yttrium and aluminum salt solution for a time to allow polymerization among the yttrium and aluminum functional groups, and carboxyl groups for forming the yttrium and aluminum water soluble polymer.
1 more element
A method for fabricating yttrium aluminum garnet fibers, comprising the steps of:
- forming a water-soluble polymer solution from yttrium and aluminum salts mixed with a polar solvent and an acid having at least two carboxyl groups;
- heating the water-soluble polymer solution to adjust the concentration thereof to provide an oxide char yield of at least 20 percent on a weight percent basis and a viscosity of at least 10.sup.5 centipoise;
- and
- fabricating fibers from the adjusted water-soluble polymer in an inert atmosphere.
1 more element
A method for making yttrium aluminum garnet powder, comprising the steps of:
- mixing an yttrium salt with an aluminum salt in an yttrium to aluminum molar ratio of about 3 to 5;
- adding said yttrium and aluminum salt mixture to a solution containing NH.sub.3 and distilled water at room temperature to produce a precipitate in a suspension;
- collecting and washing said precipitate;
- drying the precipitate;
- and
- calcining the precipitate to make yttrium aluminum garnet powder.
3 more elements
Dependencies are inferred from the claim text.