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.
19 Citations
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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Current AssigneeUnited States Of America As Represented By The Secretary Of The Air Force
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Original AssigneeUnited States Of America As Represented By The Secretary Of The Air Force
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InventorsReynolds, George H., McQuillan, Barry W.
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Primary Examiner(s)Lorin, Hubert C.
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Application NumberUS07/217,991Time in Patent Office518 DaysField of Search252/506, 252/507, 252/508, 423/445, 423/447.1, 423/447.2, 423/447.5, 423/448, 423/449, 423/460, 264/29.1, 264/29.2, 264/82, 264/60, 264/66, 264/61, 264/DIG. 19, 264/DIG. 25, 427/447.6, 427/447.8US Class Current264/640CPC Class CodesC04B 35/117 CompositesC04B 35/119 with zirconium oxideC04B 35/44 based on aluminatesC04B 35/62236 Fibres based on aluminium o...Y10S 264/19 Inorganic fiberY10S 264/25 Metallic oxide
