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Method for rapid fabrication of fiber preforms and structural composite materials

United States Patent

*** EXPIRED ***
5,744,075
April 28, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50.degree. C. for 14 hours and hot pressed at 2000 psi at 400.degree. C. for 3 hours. The hot pressed part is carbonized at 650.degree. C. under nitrogen for 3 hours and graphitized at 2400.degree. C. to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc.
Klett; James W. (Knoxville, TN), Burchell; Timothy D. (Oak Ridge, TN), Bailey; Jeffrey L. (Clinton, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 444,986
May 19, 1995
This invention was made with Government support under contract DE-AC05-84OR21400 awarded by the U.S. Department of Energy to Martin Marietta Energy Systems, Inc. and the Government has certain rights in this Invention.