Method of making carbon-carbon composites
A method for fabricating a high-strength, high-modulus and high thermal and electrical conducting 2D laminate carbon-carbon composite is described comprising the steps of: (a) forming a green laminate composite comprising: (1) graphitizible carbon cloth plies, (2) fine graphitizible pitch powder; said cloth plies comprising mesophase derived pitch fiber tow with moduli in a range of 25 to 140 Msi, and (3) thermal conductivity enhancers; (b) heating the green laminate composite to a temperature high enough to cause the pitch powder to soften and pressing the composite to form a pressed green laminate composite comprised of graphitizible carbon cloth, pitch matrix and thermal conductivity enhancers; (c) heating the pressed green composite to at least 500 C. to: (1) carbonize the pitch, (2) form a carbon matrix and (3) shrink and crack the matrix carbon; (d) impregnating the composite with additional graphitizible pitch by covering the composite with the pitch and heating the covered composite to at least 200 C. to melt the pitch and permit it to flow into the composite and then increasing the pressure to at least 15 Psi; (e) heating the composites to at least 900 C.; (f) repeating steps d and e at least once; (g) heating the composite to between 2,400 to 3,100 C to graphitize the fibers and the pitch matrix carbon in the composites to produce a graphitized composite having cracks and pores; and (h) reimpregnating the graphitized composites by infiltrating the cracks and pores of the composites with a hydrocarbon gas at a temperature in the range 982 to 1,490 C. and depositing pyrolytic carbon in the pores and cracks.
- Assignee:
- IMS; EDB-93-098146
- Patent Number(s):
- US 5217657; A
- Application Number:
- PPN: US 7-783577
- OSTI ID:
- 6460855
- Resource Relation:
- Patent File Date: 28 Oct 1991
- Country of Publication:
- United States
- Language:
- English
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Method of making carbon-carbon composites
Method of making carbon-carbon composites
Related Subjects
CARBON
FABRICATION
COMPOSITE MATERIALS
CARBON FIBERS
ELECTRIC CONDUCTIVITY
HEATING
PYROLYTIC CARBON
THERMAL CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FIBERS
MATERIALS
NONMETALS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
360601* - Other Materials- Preparation & Manufacture