Pitch infiltration of carbon fiber preforms under high pressure

Details Pitch infiltration of carbon fiber preforms under high pressure Pitch infiltration of carbon fiber preforms under high pressure

2006-06-20

2009-12-15

Nguyen, Kahnh (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

In specific atmosphere

C264S257000

Reexamination Certificate

active

07632436

ABSTRACT:
Process of manufacturing carbon-carbon composite preform by: (i.) arranging batch of carbon fiber preforms in infiltration vessel; (ii.) flooding vessel with hot liquid phase pitch at atmospheric pressure in inert atmosphere; (iii.) raising pressure in infiltration vessel to elevated pressure, and then slowly lowering pressure; and (iv.) repeating step (iii.). An apparatus that may be used is a heated infiltration vessel capable of operating at pressures above 100 psi, possible equipped with means to circulate heated pitch inside the vessel, in order to facilitate heat transfer into the carbon fiber preforms being infiltrated by the pitch. The need for a vacuum pump is eliminated, and the time spent heating the preform is substantially reduced. Instead of vacuum, cycled high pressure is employed to infiltrate carbon fiber preforms with pitch. The use of preheated pitch as a heat transfer agent avoids the slow transfer of heat into the preform prior to infiltration.

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