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Development of continuous preparation process of the coiled-carbon fiber by CVD process

CVD法连续制备卷曲碳纤维工艺的开发

基本信息

批准号：
06555185
负责人：
MOTOJIMA Seiji
金额：
$ 4.22万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555185/
关键词：
Carbon fibers Vapor grown carbon fibers (VGCF)Coiled carbon fibers CVD Acetylene

项目摘要

1) Micro-coiled carbon fibers were prepared by a metal catalyst activated pyrolysis of acetylene using a batch-type reactor (23 mm I.D,horizontal -type). The preparation conditions were examined in detail, and the growth mechanism was discussed.(1) It was found that Fe and NIs powders, those were reported so far to have no catalytic effects for the preparation of the carbon coils, have some catalytic effects under restricted conditions, and gave a coil yield of 10-20%.(2) Among transition metal carbides, TiC powder exclusively gave the carbon coils. Among titanium oxides, Ti203 powder and oxidized Ti plate gave the carbon coils (coil yield : 13-27%).(3) Deposition behaviors of total carbon and carbon coils on the crystal faces of a Ni single crystal were examined. The catalytic activity of respective crystal faces were as follows ; Ni(100) > (11) > (110). The coil yield for the Ni(100) was three time of that of the Ni(110). It was supposed that a driving force of coiling of the carbon fibers was this anisotropic behavior for the carbon deposition on the respective crystal faces of the catalysts.2) Micro-coiled carbon fibers were prepared using a intermittent or contimuous preparation apparatus (60 mm I.D.x1,000 mm long), and growth conditions were examined in details.(1) The carbon coils exclusively grew on the upper part of the source gas inlet.(2) The coil yield lineary increased with increasing reaction time, and the coils with 1-2 mm long were obtained.(3) The layr thickness of the hard deposits increased with increasing reaction time, especially after 10 min.(4) Ni powder was the most effective catalyst.(5) Powder-like coils having 1-5 micron in coil length were obtained by abrading bulk-coils using emery papers. The distribution of coil length depended on the grain size of the used emery papers.3) Designing of a mini plant (capacity : few hundred grams/month) for the praparation of large samples have been accomplished, and now in preparing the apparatus.

1)采用间歇式反应器（内径23 mm，卧式），通过金属催化剂活化裂解乙炔制备微螺旋碳纤维。详细考察了制备条件，并对生长机理进行了探讨。(1)发现Fe和NiS粉末在限制条件下具有一定的催化作用，并且得到10- 20%的线圈产率，而迄今为止报道的Fe和NiS粉末对碳线圈的制备没有催化作用。(2)在过渡金属碳化物中，TiC粉末专门产生碳线圈。在钛氧化物中，Ti 2 O3粉末和氧化的Ti板产生碳线圈（线圈产率：13-27%）。(3)研究了总碳和碳线圈在镍单晶晶面上的沉积行为。各晶面的催化活性为：Ni（100）>（11）>（110）。Ni（100）的线圈产率是Ni（110）的3倍。推测碳纤维卷曲的驱动力是碳沉积在催化剂的各个晶面上的这种各向异性行为。2）使用间歇或连续制备装置（60 mm I.D. × 1，000 mm长）制备微卷曲碳纤维，并详细检查生长条件。(1)碳盘管仅生长在源气体入口的上部。(2)线团产率随反应时间的增加而线性增加，得到1-2 mm长的线团。(3)随着反应时间的增加，硬质沉积层的厚度增加，特别是在10 min后。(4)Ni粉是最有效的催化剂。(5)通过使用砂纸研磨大体积线圈获得线圈长度为1-5微米的粉末状线圈。线圈长度的分布取决于所用金刚砂纸的粒度。3）小型工厂（生产能力：几百克/月）的设计已经完成，现在正在准备设备。