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    • 2. 发明授权
    • Production of carbon fibers from acrylonitrile based fibers
    • 从丙烯腈基纤维生产碳纤维
    • US4397831A
    • 1983-08-09
    • US200623
    • 1980-10-27
    • Kazuhisa SaitoHiroyasu Ogawa
    • Kazuhisa SaitoHiroyasu Ogawa
    • D01F9/22D01F9/32
    • D01F9/32D01F9/22
    • An acrylonitrile based fiber is disclosed which is composed of copolymers comprising at least 96 mole % of acrylonitrile and 1.times.10.sup.-2 to 70.times.10.sup.-2 mole % of a vinyl component or vinyl components containing acidic groups, and containing a specific amount of zinc. The fiber is used in production of oxidized or flame resistant fiber. The oxidized or flame resistant fiber is produced by heat-treating or oxidizing the acrylonitrile based fiber in an oxidation furnace equipped with a plurality of roller units while limiting the shrinkage of the acrylonitrile based fiber within specific limits as the oxidation proceeds. On carbonizing the above oxidized or flame resistant fiber while limiting the shrinkage thereof a carbon fiber which is of high strength and low fluffing is obtained.
    • 公开了一种基于丙烯腈的纤维,其由包含至少96摩尔%的丙烯腈和1×10-2至70×10-2摩尔%的乙烯基组分或含有酸性基团的乙烯基组分并含有特定量的锌的共聚物组成。 该纤维用于生产氧化或阻燃纤维。 氧化或阻燃纤维通过在配备有多个辊单元的氧化炉中热处理或氧化丙烯腈基纤维来制造,同时将丙烯腈基纤维的收缩限制在氧化进行的特定限度内。 在对上述氧化或阻燃纤维进行碳化同时限制其收缩的同时获得高强度和低绒毛的碳纤维。
    • 6. 发明授权
    • Ferromagnetic powder
    • 铁磁粉
    • US06506264B1
    • 2003-01-14
    • US09601942
    • 2000-08-10
    • Seiichi HisanoKazuhisa SaitoKazushi SanoAkio SawabeAkito InoueKenichi Inoue
    • Seiichi HisanoKazuhisa SaitoKazushi SanoAkio SawabeAkito InoueKenichi Inoue
    • H01F1055
    • H01F1/06B22F1/0011C22C33/0285G11B5/70621G11B5/714
    • A ferromagnetic powder containing iron as the principal component and containing more than 5 to 50 at. % Co, 0.1 to 30 at. % Al, 0.1 to 10 at. % of a rare earth element inclusive of Y, 0.05% by weight or less of an element belonging to Group 1a of the Periodic Table, and 0.1% by weight or less (inclusive of 0% by weight) of an element belonging to Group 2a of the Periodic Table, the powder comprising flat acicular particles having a mean major axis length of 0.01 to 0.40 &mgr;m and a crystallite diameter as determined by X-ray diffraction (Dx) of 50 to 250 angstrom, provided that the cross section diameter in the minor axis direction cut perpendicular to the major axis has a larger width and a smaller width, and that this cross section ratio in the minor axis direction, which is a larger width to smaller width ratio, uniformly yields a value of greater than 1, preferably 1.5 or higher, and the powder yielding a &sgr;s/Dx ratio of 0.7 or higher, wherein, &sgr;s represents the saturation magnetization and Dx represents the crystallite size determined by X-ray diffraction.
    • 含有铁作为主要成分并含有5〜50个以上的铁磁粉末。 %Co,0.1〜30at。 %Al,0.1〜10at。 含有Y的稀土元素的%,属于元素周期表的第1a族的元素的0.05重量%以下,属于第2a族的元素的0.1重量%以下(包括0重量%) 的周期表的粉末,该粉末包含平均长轴长度为0.01至0.40μm的扁平针状颗粒和通过X射线衍射测定的微晶直径(Dx)为50至250埃,条件是在 垂直于长轴的短轴方向具有较大的宽度和较小的宽度,并且短径方向上的宽度与宽度比较大的横截面比均匀地产生大于1的值,优选地 1.5或更高,并且产生0.7或更高的sigmas / Dx比的粉末,其中sigmas表示饱和磁化强度,Dx表示通过X射线衍射确定的微晶尺寸。
    • 9. 发明授权
    • Process for producing carbon fibers
    • 生产碳纤维的方法
    • US4069297A
    • 1978-01-17
    • US674244
    • 1976-04-06
    • Kazuhisa SaitoHiroyasu Ogawa
    • Kazuhisa SaitoHiroyasu Ogawa
    • D01F9/14D01F9/22D01F9/32D01F9/12
    • D01F9/14D01F9/22D01F9/32
    • 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.degree. to about 300.degree. 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.degree. to about 1,000.degree. 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.degree. C for 15 minutes); and then heat treating the carbonized fibers at constant length at a temperature of up to about 3,000.degree. C in a non-oxidizing atmosphere.
    • 一种连续生产碳纤维的方法,其包括在约200至约300℃的温度下在氧化气氛中预氧化含有至少约90重量%的丙烯腈的聚丙烯腈纤维,同时使纤维收缩约40至约70% (在1mg / d的负荷下测定的纤维的自由收缩)随着预氧化的进行; 然后在非氧化气氛中将约500℃至约1000℃的预氧化纤维碳化,使得纤维的收缩最终变为约40至约70%(当放置纤维时测定的预氧化纤维的自由收缩率 在1mg / d的负荷下,在1000℃下加热15分钟); 然后在非氧化性气氛中在高达约3000℃的温度下以恒定长度热处理碳化纤维。