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  • 1
    facet.materialart.
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    Status of High-Strength Nanotube Composites at Johnson Space Center (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Single-wall carbon nanotubes offer extraordinary mechanical properties that could start a revolution in materials science. The combination of very high strength and modulus with high strain to failure makes nanotubes an ideal fiber for strengthening in composites. Because of the scale of these fibers, new challenges exist for processing of composite materials and materials characterization. Our project includes aspects of nanotube materials from production and characterization to purification and incorporation into composites for mechanical testing. Early results show that some new techniques will be necessary for the strength of single wall nanotubes to be fully utilized. Current research at JSC focuses on structural polymeric materials to attempt to lower the weight of spacecraft necessary for interplanetary missions. Studies show good nanotube dispersion and wetting by the epoxy materials. Results of tensile strength tests will also be reported. This presentation will focus on current research into polymer nanotube composites and the next steps toward this revolution in aerospace materials.
    Keywords: Composite Materials
    Type: NanoSpace 2000; Jan 24, 2000 - Jan 28, 2000; Houston, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Single-Wall Carbon Nanotube Production by the Arc Process: A Parametric Study (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Single wall carbon nanotubes are produced using the arc discharge process. Graphite anodes are filled with a mixture of nickel and yttrium metallic powders, then vaporized by creating a high current arc. By varying the current, gap distance, and ambient pressure it is shown that the best yield of single wall carbon nanotubes is obtained within a narrow range of conditions. The relative yield and purity of the product are indicated semi-quantitatively from scanning electric microscopy (SEM) and thermogravimetric analysis (TGA). Two types of anodes have been investigated. The first is hollow and filled with a powder mixture of graphite, nickel and yttrium. The second is filled with a paste made of a mixture of metal nitrates, graphite powder and carbon adhesive, then reduced in an argon atmosphere at high temperature. Product purity and yield will be compared for the two types of anodes. The graphite in the anodes may have hydrogen attached in the pores. To remove this impurity anodes have been baked up to 1400 - 1500 C. The effect of baking the anodes on impurities in the product will be given.
    Keywords: Composite Materials
    Type: JSC-CN-6070 , NanoSpace 2000; Jan 23, 2000 - Jan 28, 2000; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Carbon Nanotube Composites: Strongest Engineering Material Ever? (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The primary goal of the carbon nanotube project at Johnson Space Center (JSC) is to fabricate structural materials with a much higher strength-to-weight ratio than any engineered material today, Single-wall nanotubes present extraordinary mechanical properties along with new challenges for materials processing. Our project includes nanotube production, characterization, purification, and incorporation into applications studies. Now is the time to move from studying individual nanotubes to applications work. Current research at JSC focuses on structural polymeric materials to attempt to lower the weight of spacecraft necessary for interplanetary missions. These nanoscale fibers present unique new challenges to composites engineers. Preliminary studies show good nanotube dispersion and wetting by the epoxy materials. Results of tensile strength tests will also be reported. Other applications of nanotubes are also of interest for energy storage, gas storage, nanoelectronics, field emission, and biomedical uses.
    Keywords: Composite Materials
    Type: Nov 29, 1999 - Dec 03, 1999; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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