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DEVELOPMENT OF NOVEL PREPARATION PROCESS OF MICRO-COILED CARBON FIBERS AND TiC FIBERS

微卷碳纤维和TiC纤维新型制备工艺的开发

基本信息

批准号：
09555200
负责人：
MOTOJIMA Seiji
金额：
$ 6.91万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Micro-coiled carbon fibers were prepared by the metal catalytic pyrolysis of acetylene containing small amounts of thiophene as an impurity using various type reactors. The reaction conditions and some properties of the obtained carbon coils were examined. And then, micro-coiled TiC fibers were obtained by the vapor phase titanizing of the carbon coils, and the reaction conditions and some properties were examined. The obtained results can be summarized as follows(A) Preparation and properties of carbon micro-coils :(1) New reactor with multiple source gas inlets were devised to obtain large amount of carbon coil samples. Coil yield of 20 mg/cm^2-substrate could be obtained for 2-hr reaction time.(2) Using the reactor made by lnconel, large amounts of carbonaceous deposits were formed on the surface of the reactor, and the coil yield was only 1-3mg/cm^2-substrate. Iron metal showed the negative effects the growth of carbon coils.(3) Using novel large reactor of 100 mm diam. and 1,000 m … More m long with multuple source gas inlets, the coil samples of 50g/day could be obtained(4) Acetylene was an exclusive source gas for obtaining carbon coils. Using propane as the source gas, small amounts of carbon coils with irregular coiling patterns was obtained via formation of acetylene by the pyrolysis of propane.(5) Metal oxides, such as Ta205, Nb205, NiO, as well as metal elements showed catalytic activities for growing carbon coils.(6) Application of vias voltage to the substrate showed strong effects the growth of carbon coils, and the coil yield increased to 1.5-2 times that of without vias voltage.(7) Carbon coils were an amorphous, but could be graphitized by the heat treatment at 3000 "*"C for 6-hr in CO+CO2 atmosphere.(B) Preparation of micro-coiled TiC fibers and some properties :(1) Carbon coils could be easily titinized at 800-1200"*"C under TiCI4+H2 atmosphere with full preservation of the coiling morphology.(2) Using very regular-coiled carbon fibers as a source coils, coiling patterns of the coils gradually disappeared with increasing reaction, and then disappeared to form straight fibers with continuous pores of submicron diameters in the fiber axis.(3) TiC micro-coils/micro-tubes have a bulk electrical resisitivity of 0.1-0.01 0cm depending on the bulk density and Ti/C ratio. Less

以含少量噻吩杂质的乙炔为原料，采用金属催化裂解的方法，在不同类型的反应器中制备了螺旋状碳纤维。考察了反应条件和所得碳线圈的一些性能。在此基础上，采用气相渗钛的方法制备了微螺旋状TiC纤维，并对反应条件和部分性能进行了研究。（A）碳微线圈的制备及性能研究：（1）设计了一种新型的多源进气反应器，以获得大量的碳线圈样品。反应时间为2小时，可获得20 mg/cm^2底物的线团产率。(2)用Inconel合金制造的反应器，在反应器表面形成大量的碳沉积物，线圈产率仅为1- 3 mg/cm ^2-底物。金属铁对碳卷的生长有负面影响. (3)采用直径为100 mm的新型大型反应器。1 000米 ...更多信息（4）乙炔是获得炭卷的唯一气源。以丙烷为原料气，通过裂解生成乙炔，得到了少量的不规则螺旋状碳线圈。(5)金属氧化物如Ta 205、Nb 205、NiO以及金属元素显示出用于生长碳线圈的催化活性。(6)在衬底上施加通孔电压对碳线圈的生长有很强的影响，线圈产率提高到不施加通孔电压的1.5-2倍。(7)碳卷是无定形的，但在CO+ CO_2气氛中在3000 ℃下热处理6小时可石墨化。(B)（1）在800-1200 ℃、TiCl_4 + H_2气氛下，碳卷可以很容易地钛化，并能保持完整的螺旋结构。(2)以规则卷曲的碳纤维为卷曲源，随着反应的进行，碳纤维的卷曲形态逐渐消失，然后消失，形成直纤维，纤维轴上有连续的亚微米孔径的孔。(3)TiC微线圈/微管具有0.1- 0.010cm的体电阻率，取决于体密度和Ti/C比。少