CARBON-CARBON COMPOSITES PREPARED BY A RAPID DENSIFICATION PROCESS I - SYNTHESIS AND PHYSICO-CHEMICAL DATA

摘要

A new process for the rapid densification (1.5-2 mm h(-1) at 1000 degrees C for a carbon felt) of carbon porous preforms is described and physico-chemical data are given: density, porosity, and kinetics. The reinforcements chosen in this study are a Le Carbone Lorraine(R) rayon based felt (RVC 2000) and two types of PAN based carbon fibers (T 300 type and AS 4 Courtaulds). The composites are processed with cyclohexane as a precursor in the 900-1350 degrees C temperature range. The reasons for rapid densification by this peculiar process are discussed considering the thermal gradient which exists within the preform. (C) 1997 Elsevier Science Ltd. [References: 10]