Abstract: A method is taught for protecting fuel contacting surfaces of a gas turbine engine from carbon deposition by the application of a coating of alumina thereto.

Abstract: Aluminum-base alloys which are provided which possess highly desirable properties, such as relatively low density, high modulus, high strength/ductility combinations, strong natural aging response with and without prior cold work, higher artificially-aged strength than existing Al-Li alloys with and without prior cold work, weldability, good cryogenic properties, and good elevated temperature properties. In one embodiment, aluminum-base alloys are provided having Al-Cu-Li-Mg compositions in the following ranges: 5.0-7.0 Cu, 0.1-2.5 Li, 0.05-4 Mg, 0.01-1.5 grain refiner selected from Zr, Cr, Mn, Ti, Hf, V, Nb, B, TiB.sub.2, and mixtures thereof, and the balance essentially Al. In another embodiment, aluminum-base alloys are provided having Al-Cu-Li-Mg compositions in the following ranges: 3.5-5.0 Cu, 0.8-1.8 Li, 0.25-1.0 Mg, 0.01-1.5 grain refiner selected from Zr, Cr, Mn, Ti, Hf, V, Nb, B, TiB.sub.2, and mixtures thereof, and the balance essentially Al.

Abstract: Elements for use as protecting fuel contacting surfaces of a gas turbine engine are protected from carbon deposition by heating the element in a nitrogen containing atmosphere for sufficient time to cause penetration and absorption of nitrogen into the grain boundaries of the alloy surface, which acts as a barrier between the hydrocarbon fuel and the catalytic elements in the surfaces.

Abstract: A method is taught for protecting the surface of a metal subject to hydrogen embrittlement from hydrogen absorption. An adherent coating is formed on the surface of the metal substrate by heating the substrate, applying thereto a colloidal alumina suspension in a vaporizable carrier, and further heating said substrate and applied alumina suspension at an elevated temperature to form a protective alumina coating. Dopants may be employed to increase the inhibition of hydrogen diffusion through the alumina coating.

Abstract: A method is taught for protecting fuel contacting surfaces of a gas turbine engine from carbon deposition by the application of a coating of tungsten disulfide.

Abstract: A method is taught for the replacement of turbine disk airseal lands, whereby a replacement land ring is solid state bonded to the disk in place of a worn or damaged land.

Abstract: A seal is provided for preventing passage of working medium gases between the roots of the rotor blades of a gas turbine engine and the rotor thereof. The seal comprises a compressed laminar exfoliated graphite piece placed in the cavity between the root of the rotor blade and the receiving slot in the rotor disk, which piece expands upon heating to seal said cavity.

Abstract: A seal is provided for preventing passage of working medium gases between the roots of the rotor blades of a gas turbine engine and the rotor thereof. The seal comprises a laminar exfoliated graphite piece placed in the cavity between the root of the rotor blade and the receiving slot in the rotor disk.

Abstract: A method is taught for the isostatic forging of integrally bladed rotors, in which deformable hollow single crystal blades are protected from deformation during diffusion bonding to the disk by encapsulation in a ceramic protective shell. The ceramic shell serves to occupy the areas between the blades and the surrounding forging die set, so that during application of high temperatures and pressures, damage to the blades is prevented without the use of complex segmented die assemblies.

Abstract: A method is taught for repair of holes in superalloy or titanium materials by using plugs of the same or similar material and heat treatment, whereby a fully recrystallized joint interface is achieved between the plug and the walls of the hole.

Abstract: A method for use in photochemical machining of titanium or zirconium substrate articles. A coating of silver is deposited onto the substrate and a photoresist is applied onto this coating. The photoresist is selectively patterned and removed from unexposed areas thereof. The silver coating is then selectively removed from the substrate at areas not covered by the photoresist without removing material from the substrate. Photochemical etching is then performed to remove material from the substrate at areas thereof not covered by the silver coating. The remaining silver coating may then be removed to yield a titanium or zirconium workpiece having the desired pattern etched into the surface thereof.

Abstract: An arc-melting method is taught for the formation of metallic-second phase composite materials. The method involves the formation of an intermediate composite material comprising a relatively high loading of second phase particles dispersed in a metal matrix. This intermediate material is then combined with an additional amount of metal and arc-melted to form a final composite comprising a lower loading of the second phase particles dispersed in a final metallic matrix. The final metallic matrix may be comprised of a metal, metal alloy, or intermetallic, while the second phase particles may comprise ceramic materials such as borides, carbides, nitrides, silicides, oxides or sulfides.

Abstract: A binder composition is taught for the granulation of fine particulate fertilizer, which binder comprises an admixture of reactive carbonate, sulfate, silicate strengthener, and water dispersant, said binder being reactive in the presence of an acid activator.

Abstract: The present invention relates to the formation of whisker reinforced metal matrix composites in which complex boride or carbide whiskers having an aspect ratio of greater than 10:1 are distributed throughout a metal, metal alloy, or intermetallic matrix. Exemplary complex boride whiskers include TiNbB, TiTaB, TiVB, NbHfB, and TiNbMoB. Exemplary complex carbide whiskers include TiNbC, TiVC, TiZrC, TiHfC, and TiTaC. A method for the in-situ formation of complex boride and complex carbide whiskers within metallic matrices is disclosed which involves reacting a mixture of individual complex ceramic-forming constituents in the presence of a metal to precipitate the desired complex ceramic whiskers in a metal matrix.

Abstract: A family of alloys based upon aluminum-copper-magnesium-silver alloys to which lithium has been added, within specified ranges, exhibits superior ambient- and elevated-temperature strength, superior ductility at ambient and elevated temperatures, extrudability, forgeability, weldability, and an unexpected natural aging response.

Abstract: The invention relates to new ceramic electrostrictive compositions having superior electrical properties, a process for the preparation of the new electrostrictive compositions and applications for the new compositions. Specifically, a solid solution composition of lead magnesium niobate-lead titanate - (barium titanate or stronium titanate) has exhibited desirable electrostrictive properties. This composition shows a diminished dependence of dielectric constant on temperature.

Abstract: This invention relates to new ceramic electrostrictive compositions having superior electrical properties, a process for the preparation of the new electrostrictive compositions and applications for the new compositions. Specifically, a solid solution composition of lead magnesium niobate-lead titanate--(barium titanate or stronium titanate) has exhibited desirable electrostrictive properties. This composition shows a diminished dependence of dielectric constant on temperature.

Abstract: This invention relates to a rapidly solidified product comprising a second phase in both a stable particulate form and a metastable flake form dispersed in an intermetallic matrix.

Abstract: A sol-gel method is disclosed for the production of polycrystalline strontium barium niobate (SBN) materials. Ceramic SBN materials produced in accordance with this method possess favorable ferroelectric properties, and are useful for electro-optic applications.

Abstract: The present invention relates to a novel binder combination for pelletized and compressed animal feed. This binder comprises a chemically reactive, molasses-free, mixture of a reactive phosphate source plus a reactive metal oxide, hydroxide, or salt.