| 摘要 |
<p>A graphite fiber having an elastic modulus E of 340 - 680 GPa, a microvoid radius of not larger than 20 ANGSTROM and a crystal size Lc ( ANGSTROM ) satisfying the following formula: Lc<3> </= 0.918 x 10<3>E - 3 x 10<5> is valuable for a composite material having an improved compression strength. The graphite fiber is made preferably by oxidizing an acrylonitrile polymer precursor containing 0.05 - 8 wt.% of comonomer units and having an iodine adsorption amount of not larger than 3 wt.% and an orientation degree of at least 85%, at 200 - 300 DEG C in an oxidative atmosphere under tension to obtain an oxidized fiber having a water adsorption of not larger than 7 wt.% and an orientation degree of at least 78%, followed by carbonization and graphitization of the oxidized fiber under tension.</p> |
