DEVELOPMENT OF CARBON/CARBON COMPOSITES BY PHENOLIC RESIN AND OXIDIZED PAN FLETS

An oxidized PAN felt was carbonized to 600 ℃ and 1 000 ℃, respectively. Carbon/carbon composites were prepared from the oxidized PAN felt, the carbonized felts, and resol type phenol formaldehyde resin. The composites were heat treated at 230 ℃, 600 ℃ and 1 000 ℃ respectively. The facture surfaces were studied by a SEM. The fractures surface of the composites with stabilized fiber felt and with 600 ℃ heat treated felt showed brittle catastrophic fracture pattern with smooth cross section;on the contrary, the composite with 1 000 ℃ heat treated felt showed pseudo plastic fracture pattern after carbonized at 600 ℃ and 1 000 ℃, respectively, and accompanied by the phenomenon of fiber pull out.