Method for making ceramic fibers from a water soluble pre-ceramic polymer solution
AssigneeThe Babcock & Wilcox Company
InventorsSung S. Pak, Archie N. Tolley
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Abstract
A method of making ceramic fibers from a water soluble pre-ceramic polymer solution by forming fibers from a water soluble pre-ceramic polymer solution, drying the formed fibers at a first temperature ranging between 600.degree. C.-750.degree. C. at a temperature heating rate of about 1.degree. C. per minute. Next, raising the first temperature to a second temperature ranging from 800.degree. C.-1000.degree. C. at about 5.degree. C. per minute, and increasing the second temperature to still a third temperature of about 1200.degree. C. at about 10.degree. C. per minute and holding at the third temperature for about 1 hour. Finally, the fibers are cooled to room temperature at a rate of about 5.degree. C. to 30.degree. C. per minute.
Claims5
An improved method for making ceramic fibers from a water soluble pre-ceramic polymer, comprising the steps of:
- making a water-soluble pre-ceramic polymer, the water soluble pre-ceramic polymer being produced by a polycondensation reaction due to heating hydrated metal salts above their melting points and holding in a well-ventilated oven to drive off water and ligands;
- making a water soluble solution by dissolving the water soluble pre-ceramic polymer in heated water;
- forming fibers from the water soluble solution;
- drying the formed fibers by heating the fibers in an oven at a rate of about 1.degree. C./minute to a first temperature ranging between 600.degree. C. to 750.degree. C.;
- raising the first temperature to a second temperature ranging from 800.degree. C. to 1000.degree. C. at about 5.degree. C./minute;
- increasing the second temperature to a third temperature of about 1200.degree. C. at about 10.degree. C./minute and holding at the third temperature of about 1200.degree. C. for about one hour;
- and
- cooling to room temperature at a rate of about 5.degree. C. to 30.degree. C./minute.
Dependencies are inferred from the claim text.