Preparation of metal oxide fibers from intercalated graphite fibers
First Claim
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1. A method for making a composite aluminum oxide-zirconinum oxide fiber, comprising the steps of:
- (a) providing a graphite fiber;
(b) intercalating a mixture of AlCl3, ZrCl4 and Cl2 into the graphite fiber to make C3+6+ AlCl4- ·
ZrCl5- by heating the mixture to 250°
C. for 4 days until all the metal chloride is intercalated into the graphite fiber; and
,(c) heating the intercalated graphite fiber in air at 800°
C. to oxidize the carbon and leave a composite aluminum oxide-zirconium oxide fiber.
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Abstract
Ceramic metal oxide fibers are made by intercalating graphitic graphite fibers with a mixture of metal chlorides and then heating the intercalated fibers to oxidize or burn off the carbon leaving a metal oxide fiber having generally the shape and structure of the graphite fiber precursors to make composite fibers, such as binary fibers of aluminum oxide-zirconium oxide and aluminum oxide-ferric oxide.
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2 Claims
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1. A method for making a composite aluminum oxide-zirconinum oxide fiber, comprising the steps of:
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(a) providing a graphite fiber; (b) intercalating a mixture of AlCl3, ZrCl4 and Cl2 into the graphite fiber to make C3+6+ AlCl4- ·
ZrCl5- by heating the mixture to 250°
C. for 4 days until all the metal chloride is intercalated into the graphite fiber; and
,(c) heating the intercalated graphite fiber in air at 800°
C. to oxidize the carbon and leave a composite aluminum oxide-zirconium oxide fiber.
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2. A method for making a composite aluminum oxide-ferric oxide fiber, comprising the steps of:
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(a) providing a graphite fiber; (b) intercalating a mixture of AlCl3 and FeCl3 into the graphite fiber by heating the mixture to about 200°
C. and gradually increasing the temperature over about 5 hours to 300°
C.; and
,(c) heating the intercalated graphite fiber in air at 800°
C. to oxidize the carbon and leave a composite aluminum oxide-ferric oxide fiber.
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Specification