发明名称 |
Process for producing carbon fibers |
摘要 |
A process for continuously producing carbon fibers which comprises preoxidizing polyacrylonitrile fibers containing at least about 90% by weight of acrylonitrile at a temperature of about 200 DEG to about 300 DEG C in an oxidizing atmosphere while allowing the fibers to shrink about 40 to about 70% (of the free shrinkage of the fibers determined under a load of 1 mg/d) with the progress of preoxidation; then carbonizing the preoxidized fibers at about 500 DEG to about 1,000 DEG C in a non-oxidizing atmosphere so that the shrinkage of the fibers finally becomes about 40 to about 70% (of the free shrinkage of the preoxidized fibers determined when the fibers are placed under a load of 1 mg/d and heated at 1,000 DEG C for 15 minutes); and then heat treating the carbonized fibers at constant length at a temperature of up to about 3,000 DEG C in a non-oxidizing atmosphere.
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申请公布号 |
US4069297(A) |
申请公布日期 |
1978.01.17 |
申请号 |
US19760674244 |
申请日期 |
1976.04.06 |
申请人 |
TOHO BESLON CO., LTD. |
发明人 |
SAITO, KAZUHISA;OGAWA, HIROYASU |
分类号 |
D01F9/14;D01F9/22;D01F9/32;(IPC1-7):D01F9/12 |
主分类号 |
D01F9/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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