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  • 1
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    Flight Performance of a Functionally Gradient Material, TUFI, on Shuttle Orbiter (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: TUFI, Toughened Uni-Piece Fibrous Insulation, a functionally gradient material has been successfully flying on the Shuttle Orbiters in several locations on two insulation substrates over the past few years. TUFI is composed of insulation and a gradated surface treatment. The locations it has flown include the base heat shield where damage had been observed after every flight before its application. It was also applied to the to of the body flap, the bottom of the body flap and around selected windows and doors where damage had been observed in the past. A description of the types of processing used including substrates will be presented and its overall performance will be reviewed.
    Keywords: Composite Materials
    Type: Pacific Rim IV International Conference; Nov 04, 2001 - Nov 08, 2001; Wailea, HI; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lightweight Thermal Protection System for Atmospheric Entry (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: TUFROC (Toughened Uni-piece Fibrous Reinforced Oxidation-resistant Composite) has been developed as a new thermal protection system (TPS) material for wing leading edge and nose cap applications. The composite withstands temperatures up to 1,970 K, and consists of a toughened, high-temperature surface cap and a low-thermal-conductivity base, and is applicable to both sharp and blunt leading edge vehicles. This extends the possible application of fibrous insulation to the wing leading edge and/or nose cap on a hypersonic vehicle. The lightweight system comprises a treated carbonaceous cap composed of ROCCI (Refractory Oxidation-resistant Ceramic Carbon Insulation), which provides dimensional stability to the outer mold line, while the fibrous base material provides maximum thermal insulation for the vehicle structure.
    Keywords: Composite Materials
    Type: ARC-15201-1 , NASA Tech Briefs, October 2007; 20-21
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    High efficiency tantalum-based ceramic composite structures (2010)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Tantalum-based ceramics are suitable for use in thermal protection systems. These composite structures have high efficiency surfaces (low catalytic efficiency and high emittance), thereby reducing heat flux to a spacecraft during planetary re-entry. These ceramics contain tantalum disilicide, molybdenum disilicide and borosilicate glass. The components are milled, along with a processing aid, then applied to a surface of a porous substrate, such as a fibrous silica or carbon substrate. Following application, the coating is then sintered on the substrate. The composite structure is substantially impervious to hot gas penetration and capable of surviving high heat fluxes at temperatures approaching 3000.degree. F. and above.
    Keywords: Composite Materials
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Toughened uni-piece, fibrous, reinforced, oxidization-resistant composite (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A composite thermal protection structure, for applications such as atmospheric re-entry vehicles, that can withstand temperatures as high as 3600.degree F. The structure includes an exposed surface cap having a specially formulated coating, an insulator base adjacent to the cap with another specially formulated coating, and one or more pins that extend from the cap through the insulator base to tie the cap and base together, through ceramic bonding and mechanical attachment. The cap and insulator base have corresponding depressions and projections that mate and allow for differences in thermal expansion of the cap and base.
    Keywords: Composite Materials
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Toughened uni-piece, fibrous, reinforced, oxidization-resistant composite (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A composite thermal protection structure, for applications such as atmospheric re-entry vehicles, that can withstand temperatures as high as 3600.degree. F. The structure includes an exposed surface cap having a specially formulated coating, an insulator base adjacent to the cap with another specially formulated coating, and one or more pins that extend from the cap through the insulator base to tie the cap and base together, through ceramic bonding and mechanical attachment. The cap and insulator base have corresponding depressions and projections that mate and allow for differences in thermal expansion of the cap and base. A thin coating of a reaction cured glass formulation is optionally provided on the structure to allow reduce oxidization and/or to reduce catalytic efficiency.
    Keywords: Composite Materials
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Oriented nanofibers embedded in a polymer matrix (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A method of forming a composite of embedded nanofibers in a polymer matrix is disclosed. The method includes incorporating nanofibers in a plastic matrix forming agglomerates, and uniformly distributing the nanofibers by exposing the agglomerates to hydrodynamic stresses. The hydrodynamic said stresses force the agglomerates to break apart. In combination or additionally elongational flow is used to achieve small diameters and alignment. A nanofiber reinforced polymer composite system is disclosed. The system includes a plurality of nanofibers that are embedded in polymer matrices in micron size fibers. A method for producing nanotube continuous fibers is disclosed. Nanofibers are fibrils with diameters of 100 nm, multiwall nanotubes, single wall nanotubes and their various functionalized and derivatized forms. The method includes mixing a nanofiber in a polymer; and inducing an orientation of the nanofibers that enables the nanofibers to be used to enhance mechanical, thermal and electrical properties. Orientation is induced by high shear mixing and elongational flow, singly or in combination. The polymer may be removed from said nanofibers, leaving micron size fibers of aligned nanofibers.
    Keywords: Composite Materials
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Tantalum-Based Ceramics for Refractory Composites (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A family of tantalum-based ceramics has been invented as ingredients of high-temperature composite insulating tiles. These materials are suitable for coating and/or permeating the outer layers of rigid porous (foam-like or fibrous) ceramic substrates to (1) render the resulting composite ceramic tiles impervious to hot gases and (2) enable the tiles to survive high heat fluxes at temperatures that can exceed 3,000 F ( 1,600 C).
    Keywords: Composite Materials
    Type: ARC-14743-1 , NASA Tech Briefs, June 2006; 18-19
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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