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| Polyacrylonitrile fibers are used to make a duplex cloth from which segments are cut, each segment sequentially placed on a foamed support and needled together with the underlying segments, to build-up a multi-layer, donut shaped preform that is densified to make a carbon-carbon composite.preform following steps (1) carbon fibers polyacrylonitrile (PAN) controlled density sheets continuous filaments short (staple) (2) two bound together (to duplex fabric) transverse displacement barbed needles (3) cut segments shapes directions stress resistance (chordal radial) (4) sequentially foam needled first layer (5) underlying second (6) continually added layers thickness strength (7) carbonized (optional) remove volatiles nonwoven Preform densified various (carbon vapor infiltration resin transfer molding thermal mechanical pressing melt etc) carbon/[carbon and/or X] (X constituents) composite application |
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