An Investigation of the Initiation and Growth Mechanisms of Filamentous Carbon Over Transition Metals

本文研究了聚乳酸的引发和生长机制， 镍、钴和镍合金上的丝状碳， 钴和铁。 计算机生成的相图用于 控制固体“表面”和本体组成。 气相 由一氧化碳、二氧化碳、甲烷 氢和水。 实验在等温， 微分重力反应器。 细丝和固体结构 使用电子显微镜沿着观察与冶金 蚀刻 用X射线衍射法进行了固相鉴定 和/或电子衍射和磁化率 测量. 激光干涉与激光散斑计量 用于生成低温“表面”相图， 探索晶体取向对丝引发的影响 和增长 碳丝的生长是催化分解的结果。 铁、镍、钴或其合金上的含碳气体。 该长丝可用于高强、轻质、高强、轻质等用途 复合材料. 然而，它们也是一个严重的腐蚀问题 用于许多过渡金属基合金和催化剂。

This is a study of the initiation and growth mechanisms of filamentous carbon on nickel, cobalt, and the alloys of nickel, cobalt, and iron. Computer.generated phase diagrams are used to control solid "surface" and bulk compositions. The gas phase consists of mixtures of carbon monoxide, carbon dioxide, methane, hydrogen, and water. Experiments are performed in an isothermal, differential, gravimetric reactor. Filament and solid structures are observed using electron microscopy along with metallurgical etching. Solid.phase identification is performed using X.ray and/or electron diffraction and magnetic susceptibility measurements. Laser interferometry and laser speckle metrology are used to generate low.temperature "surface" phase diagrams and explore crystalline orientation effects on filament initiation and growth. Carbon filaments grow as a result of catalytic decomposition of carbon.bearing gases on iron, nickel, or cobalt, or their alloys. These filaments can be used in high.strength, low.weight composites. However, they are also a serious corrosion problem for many transition.metal.based alloys and catalysts.