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

过渡金属上丝状碳的引发和生长机制的研究

• 批准号: 8722636
• 负责人: Albert Sacco, Jr.
• 金额: $ 15.9万
• 依托单位: Worcester Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-15 至 1991-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722636&HistoricalAwards=false
• 关键词: Investigation; Initiation; Growth; Mechanisms; Filamentous

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.

这是一项研究丝状碳在镍、钴和镍、钴、铁合金上的起始和生长机制。电脑。生成的相图用于控制固体“表面”和块状成分。气相由一氧化碳、二氧化碳、甲烷、氢和水的混合物组成。实验是在等温差重反应器中进行的。用电子显微镜和冶金蚀刻法观察了细丝和固体结构。固体。用x射线和/或电子衍射和磁化率测量进行相识别。激光干涉测量法和激光散斑测量法用于产生低电压。温度“表面”相图和探索晶体取向对长丝起始和生长的影响。碳丝的生长是碳催化分解的结果。在铁、镍、钴或其合金上带有气体的。这些长丝可用于高。强度、低。重量 复合材料。然而，对于许多过渡金属基合金和催化剂来说，它们也是一个严重的腐蚀问题。