Low-temperature densification of carbon fiber preforms by colloi

Details Low-temperature densification of carbon fiber preforms by colloi Low-temperature densification of carbon fiber preforms by colloi

1996-10-29

1999-11-30

Utech, Benjamin

Coating processes

Vacuum utilized prior to or during coating

427296, 427375, 427384, B05D 300

Patent

active

059939052

ABSTRACT:
An improved method for producing low-cost carbon--carbon composites based on impregnating carbon fiber mat preforms with liquid dispersions or suspensions of fine carbon particles and subsequent mechanical consolidation is disclosed. A highly porous preform of carbon fibers is impregnated by a liquid suspension of colloidal graphite and dried in air at low temperatures. Multiple impregnation and drying densification cycles provide a soft, flexible carbon--carbon composite. Subsequent mechanical consolidation methods, such as pressing or rolling, combined with rigidization by resin or pitch impregnation and carbonization, render a thin carbon--carbon composite of high bulk density. Prior to rigidization, the composite may be sewn with carbon yarns for property enhancement.

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G.M. Pajonk and J. Maire, "Preparation and Densification of Carbon/Carbon Composites by the Aerogel Method. Very Fine-Grain Carbons Obtained by CVD." Extended Abstract of the International Carbon Conference, Bordeau, France, Jul. 1984.

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