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  • 1
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    Conductive Composites Made Less Expensively (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The use of electrically conductive composite structures for electrostatic dissipation, electromagnetic interference shielding, and ground return planes could save between 30 and 90 percent of the mass of the structure, in comparison to aluminum. One strategy that has been shown to make conducting composites effectively uses intercalated graphite fiber as the reinforcement. Intercalation--the insertion of guest atoms or molecules between the graphene planes--can lower the electrical resistivity of graphite fibers by as much as a factor of 10, without sacrificing mechanical or thermal properties.
    Keywords: Composite Materials
    Type: Research and Technology 2004
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Effect of Architecture on the Resistivity of Carbon Fiber Polymer Composites (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The electrical resistivity of carbon fiber laminar composites can be tailored by weave direction, fiber composition, resin composition, applied pressure, and fiber fraction. Although the weave direction was only found to be important in the case of high aspect ratio composites, the other factors were found to influence the resistivity generally. Most intriguing, the resistivity of composites with lamina of different fiber compositions follows a parallel resistor model. This opens the door for higher performance, lower cost composites to be fabricated from these mixed fiber composites.
    Keywords: Composite Materials
    Type: E-15086 , Carbon 2005; Jul 03, 2005 - Jul 07, 2005; Gyeongju; Korea, Republic of
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Degradation of Intercalated Graphite Epoxy Composites Exposed to Low Earth Orbit (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Four different graphite fiber/epoxy composites were exposed to the wake-side low Earth orbit (LEO) environment on the Optical Reflector Materials Experiment III (ORMatE-III) platform mounted on the exterior of the ISS for two years in order to determine their long term durability in the space environment. Three of the composite samples used bromine intercalated P100 fibers and one used pristine P100 fibers. One of the P100-Br samples was coated with a protective SiO2 layer, and half of another was coated with SiO2. Results were compared with the EOIM-III experiment which exposed the same materials in LEO in the ram direction for 42 h on the Space Shuttle. Although the atomic oxygen (AO) fluence of the ORMatE-III samples was one-third of the EOIM-III exposure, the resulting effects were qualitatively the same. Both found that SiO2 coated intercalated graphite composites showed no AO erosion, verifying that conventional protection strategies are applicable to bromine intercalated composites. Both found that bromine intercalation does not alter the AO erosion rates of graphite fiber/epoxy composites. Both found no bromine was detected to have migrated into the surrounding epoxy, even for highly eroded fibers and epoxy, allaying fears that bromination could compromise the properties of the epoxy. And both found no corrosive bromine was detected to have been released by the fibers allaying fears that outgassing could degrade sensitive electronics. The uncoated EOIM-III samples suffered slightly greater erosion resulting in a slightly higher solar absorptance. The general conclusion is that ram AO exposure had very similar effects on graphite fiber epoxy composites in both the EOIM-III and ORMatE-III experiments, and in neither case did bromine intercalation of the fibers substantially influence that degradation.
    Keywords: Composite Materials
    Type: NASA/TM-2018-219928 , E-19544 , GRC-E-DAA-TN57237
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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