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  • Other Sources  (204)
  • NONMETALLIC MATERIALS  (204)
  • 2015-2019
  • 1980-1984  (204)
  • 1940-1944
  • 1
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    Hot melt adhesive attachment pad (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A hot melt adhesive attachment pad for releasably securing distinct elements together is described which is particularly useful in the construction industry or a spatial vacuum environment. The attachment pad consists primarily of a cloth selectively impregnated with a charge of hot melt adhesive, a thermo-foil heater, and a thermo-cooler. These components are securely mounted in a mounting assembly. In operation, the operator activates the heating cycle transforming the hot melt adhesive to a substantially liquid state, positions the pad against the attachment surface, and activates the cooling cycle solidifying the adhesive and forming a strong, releasable bond.
    Keywords: NONMETALLIC MATERIALS
    Type: NAS 1.71:LAR-12894-1
    Format: application/pdf
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  • 2
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    Preparation of large-particle-size monodisperse latexes in space: The STS-3, STS-4, and STS-7 mission results (1984)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Large-particle-size monodisperse latexes were prepared on four STS missions of the space shuttles Columbia and Challenger using flight hardware comprising four automated 100 cm(3) polymerization reactors. Seven polymerizations carried out on the March 1982 STS-3 mission of the Columbia, and the April 1983 STS-6 and June 1983 STS-7 missions of the Challenger, gave monodisperse latexes of 5 to 18 micron diameter with narrower particle size distributions than the corresponding ground-based control polymerizations. The rates of polymerization in microgravity were the same as on Earth. The results of these experiments are reviewed, and the prospects of the development of a space production process are discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: 2nd Symp. on Space Industrialization; p 75
    Format: text
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  • 3
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    Thermal response of advanced high temperature ceramic-composite insulation to a convectively heated environment (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Space Shuttle uses currently fibrous high temperature, reusable surface insulation (HRSI) as a Thermal Protection System (TPS) at 1260 C for normal-design mission operation. Higher density material of a similar type extended the maximum temperature to 1480 C. However, a surface temperature capability exceeding 1540 C is desired for future space vehicles, such as the Orbital Transfer Vehicle (OTV). A TPS providing such a capability would permit future entry vehicles to enter the atmosphere at a much higher velocity than the Space Shuttle. The present investigation is concerned with arc-jet test data obtained from a family of fibrous refractory-composite insulation (FRCI) materials developed to meet the future TPS requirements. FRCI materials containing between 20 and 80 percent aluminoborosilicate fibers with the balance composed of silica fibers were studied.
    Keywords: NONMETALLIC MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 4; 533-550
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  • 4
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    Catalytic surface effect on ceramic coatings for an aeroassisted orbital transfer vehicle (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Surface catalytic efficiencies of glassy coatings were determined from a reaction boundary layer computation and arc-jet data. The catalytic efficiencies of the various coatings examined are discussed in terms of their reaction-rate constants. These constants are a function of the wall temperature (1290 K to 2000 K). In addition, the advantage of a thermal protection system for a bent biconic, aeroassisted orbital transfer vehicle with a low surface catalytic efficiency is discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 5; 491-505
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  • 5
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    Adhesion between polymers and evaporated gold and nickel films (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: To obtain information on the adhesion between metal films and polymeric solids, the adhesion force was measured by means of a tensile pull test. It was found that the adhesion strengths between polymeric solids and gold films evaporated on polymer substrates were (1.11 + or - 0.53) multiplied by 10(6) N/M(2) on PTFE, about 5.49 multiplied by 10(6) N/m(2) on UHMWPE, and 6.54x10(6) on 6/6 nylon. The adhesion strengths for nickel films evaporated on PTFE, UHMWPE, and 6/6 nylon were found to be a factor of 1.7 higher than those for the gold coated PTFE, UHMWPE, and 6/6 nylon. To confirm quantitatively the effect of electron irradiation on the adhesion strength between a PTFE solid and metal films, a tensile pull test was performed on the irradiated PTFE specimens, which were prepared by evaporating nickel or gold on PTFE surfaces irradiated by 2-keV electrons for various times. After irradiation, the adhesion strength increased to (4.92 + or - 0.92)x10(6) N/m(2) for nickel coated PTFE and (1.82 + or - 0.48)x10(6) N/m(2) for gold coated PTFE. The improvement in adhesion for nickel is higher than that for gold.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-2360 , E-2018 , NAS 1.60:2360
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  • 6
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    Replacement of PBNA in HB and HC polymers used in SRM propellant and liner (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The antioxidant phenyl-beta-naphthylamine (PBNA) was used in both HB and HC polymers. The sole (domestic) supplier of PBNA has withdrawn this product from the market, primarily because of suspected health hazards. Commercially available substitute(s) were selected and qualified for use in the two polymers.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-170936 , NAS 1.26:170936 , TWR-13009
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  • 7
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    Deformations and strains in adhesive joints by moire interferometry (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Displacement fields in a thick adherend lap joint and a cracked lap shear specimen were measured by high sensitivity moire interferometry. Contour maps of in-plane U and V displacements were obtained across adhesive and adherent surfaces. Loading sequences ranged from modest loads to near-failure loads. Quantitative results are given for displacements and certain strains in the adhesive and along the adhesive/adherend boundary lines. The results show nonlinear displacements and strains as a function of loads or stresses and they show viscoelastic or time-dependent response. Moire interferometry is an excellent method for experimental studies of adhesive joint performance. Subwavelength displacement resolution of a few micro-inches, and spatial resolution corresponding to 1600 fringes/inch (64 fringes/mm), were obtained in these studies. The whole-field contour maps offer insights not available from local measurements made by high sensitivity gages.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-172474 , NAS 1.26:172474
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  • 8
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    Recrystallization of polycrystalline silicon (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Optical metallography is used to investigate the recrystallization properties of polycrystalline semiconductor-grade silicon. It is found that polycrystalline silicon recrystallizes at 1380 C in relatively short times, provided that the prior deformation is greater than 30%. For a prior deformation of about 40%, the recrystallization process is essentially complete in about 30 minutes. Silicon recrystallizes at a substantially slower rate than metals at equivalent homologous temperatures. The recrystallized grain size is insensitive to the amount of prestrain for strains in the range of 10-50%.
    Keywords: NONMETALLIC MATERIALS
    Type: Materials Science and Engineering; 47; Mar. 198
    Format: text
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  • 9
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    Oxidation stability of advanced reaction-bonded Si3N4 materials (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Four slip-cast, injection-molded and isostatically-pressed specimens of reaction-bonded silicon nitride (RBSN) were subjected to static oxidation tests at 900 C for 10 hours. Specimens containing 8-10% interconnected open porosity of size greater than one micron exhibited a 20-30% decrease in average room temperature four-point flexure strength, while those with 10% open porosity of magnitudes much smaller than one micron as well as those with 2-4% interconnected open porosity of about one micron did not decrease in strength after 900 C exposure. It was determined that preoxidation treatment at 1350 C prevents the 20-30% strength degradation due to internal oxidation, and evidence is presented which suggests that surface pit formation in some RBSN may result from contamination by the furnace environment rather than any intrinsic material properties.
    Keywords: NONMETALLIC MATERIALS
    Type: ACS PAPER 52-B-80P
    Format: text
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  • 10
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    High performance channel injection sealant invention abstract (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High performance channel sealant is based on NASA patented cyano and diamidoximine-terminated perfluoroalkylene ether prepolymers that are thermally condensed and cross linked. The sealant contains asbestos and, in its preferred embodiments, Lithofrax, to lower its thermal expansion coefficient and a phenolic metal deactivator. Extensive evaluation shows the sealant is extremely resistant to thermal degradation with an onset point of 280 C. The materials have a volatile content of 0.18%, excellent flexibility, and adherence properties, and fuel resistance. No corrosibility to aluminum or titanium was observed.
    Keywords: NONMETALLIC MATERIALS
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