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Production of pervious low density carbon fiber reinforced composite articles
in a composite structure is formed by sheathing one or more elements, of vanadium metal or vanadium base. alloy containing one or more of Ti, Zr or Hf in an amount of less than 10 atomic % with a pure metal selected from the group consisting of Cu, Au and Ag. The said composite structure is subjected to plastic working, the resuiting composite structure is coated with gallium and this is then heat treated to diffuse the gallium into said coated layers and to produce, simultaneously, V3Ga in a boundary zone.
Tantalum carbide-tantalum fiber composite material Riley, R. E. and Taub, J. M. (United State Atomic Energy Commission) US Pat 3 779 716 (18Dec 1973) The thermal stress resistance of refractory metal carbides is substantially improved by the addition of chopped metal fibres. A composite consisting of 50 volume % TaC-50 volume % chopped Ta wire shows approximately a 40% improvement in thermal stress resistance over that of pure TaC.
Composite material having bonded members of beryllium Berman, V. L. (Rockwell International Corp) US Pat 3 779 721 (18Dec 1973) Two metallic surfaces in substantially uniform area contact, with an intervening layer of a brazing alloy are joined by intermolecular migration of the alloy into both surfaces while the alloy is maintained in liquid form by prolonged furnace heating. Degradation of the metallic surfaces which would normally result from such prolonged heating due to the excessive migration of the brazing alloy into the base metal is prevented by a compatible metallic membrane applied to one or both sides of the stated intervening layer.
High temperature-high strength alloy glass fiber forming bushing Hansen, J. H. and Getz, R. W. US Pat 3 779 728 (18Dec 1973) A high temperature-high strength alloy comprising platinum, rhodium and one or more metals consisting of molybdenum, tungsten iridium and rhenium is fabricated into apparatus adapted to receive and controllably emit molten material for attenuation into glass fibres.
COMPOSITES. NOVEMBER 1974
Method of forming composite fiber bundle Hicks, J. W. (The Bendix Corp) US Pat 3 779 729 (18 Dec 1973) A method of forming a glass fibre device including the steps of: forming a fibre bundle comprising a plurality of parallel fibres; heating said fibre bundle to a working temperature; while at the working temperature forcing the ends of said bundle towards each other while constraining the ends of the bundle from radial movement in a plane normal to the longitudinal axis of the bundle to form a fused bundle of glass fibres having generally parallel ends of generally, the original corss-section dimension and an outwardly curved bulbous centre section immediately adjacent the ends of the bundle.
Composite fibers of alkali metal hexatitanate and rutile TiO2 Emslie, R. S. (E. I. Du Pont de Nemours and Co) US Pat 3 779 784 (18 Dec 1973)" A fibrous material is provided which is composed of composite fibres having a number average diameter of up to about 10/am and an average length/ diameter ratio of at least about 5/1. The fibres have a core of alkali metal hexatitanate encapsulated by a shell of rutile TiO2 and are essentially inert to aqueous 5% by weight HF solution. The fibrous material is particularly useful in the reinforcing of plastics.
Production of pervious low density carbon fiber reinforced composite articles Park, I. K. (Celanese Corporation) US Pat 3 779 789 (18Dec 1973) The efficient production of pervious low density carbon fibre reinforced composite articles is made possible through the use of the present invention. A fibrous open weave tape (as described) which is capable of undergoing conversations to a carbonaceous fibrous material is continuously passed in the direction of its length through a series of heating zones to form a fibrous carbon tape (preferably of graphitic carbon) wherein an open weave construction is maintained. At least one layer of the resulting fibrous open weave carbon tape may be impregnated with a thermosetting resinous material, and subsequently cured t6 form a pervious composite article. The composite articles of the present invention exhibit a high specific modulus and strength, and are
extremely lightweight. The lightweight composite articles may be utilized as structural elements and are particularly suited for use as a facing sheet of an acoustic sandwich liner which serves as a noise suppression function in jet engines.
Method of fabricating thin graphite reinforced composites of uniform thickness Hertz, J. (General Dynamics Corporation) US Pat 3 779 851 (18Dec 1973) A method of making high strength, low thermal expansion thin composite structures of uniform thickness is disclosed. A plurality of resin inpregnated graphite fibre sheets are laminated together to provide composite preforms. A plurality of the preforms are then bonded together in a pseudoisotropic arrangement between parallel plates. The resulting structures are especially useful as substrates for flat or slightly contoured mirrors.
Method of producing zirconium diffusion barrier in titanium-silicon carbide composite materials McMurray, N. D. and Tumey, M. J. (General Motors Corporation) US Pat 3 779 884 (18 Dec 1973) A composite article, comprising silicon carbide-containing reinforcing filaments in a titanium or titanium alloy matrix, is found to have increased strength when the filaments are initially provided with a thin coating of zirconium. The zirconium acts as a barrier to interdiffusion of titanium and silicon carbide and prevents weakening of the composite structure which would otherwise result from such interdiffusion.
Sizing composition and glass fibers treated therewith Ward, J. E. (Owens-Coming Fiberglas Corporation) US Pat 3 779 981 (18Dec 1973) A sizing for glass fibers, comprising water soluble epoxy resins, an organosilane, polyvinyl acetate copolymer and a lubricant is provided, whereby the sized glass fibres in the form of strands, possess excellent integrity.
Method of dispensing a mixture of resin and expanded thermoplastic spheres Scharfenberger, J. A. (Ransburg Electro-Coating Corp) US Pat 3 780 942 (25 Dec 19 73) A system for and a method of dispen-
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Tantalum carbide-tantalum fiber composite material Riley, R. E. and Taub, J. M. (United State Atomic Energy Commission) US Pat 3 779 716 (18Dec 1973) The thermal stress resistance of refractory metal carbides is substantially improved by the addition of chopped metal fibres. A composite consisting of 50 volume % TaC-50 volume % chopped Ta wire shows approximately a 40% improvement in thermal stress resistance over that of pure TaC.
Composite material having bonded members of beryllium Berman, V. L. (Rockwell International Corp) US Pat 3 779 721 (18Dec 1973) Two metallic surfaces in substantially uniform area contact, with an intervening layer of a brazing alloy are joined by intermolecular migration of the alloy into both surfaces while the alloy is maintained in liquid form by prolonged furnace heating. Degradation of the metallic surfaces which would normally result from such prolonged heating due to the excessive migration of the brazing alloy into the base metal is prevented by a compatible metallic membrane applied to one or both sides of the stated intervening layer.
High temperature-high strength alloy glass fiber forming bushing Hansen, J. H. and Getz, R. W. US Pat 3 779 728 (18Dec 1973) A high temperature-high strength alloy comprising platinum, rhodium and one or more metals consisting of molybdenum, tungsten iridium and rhenium is fabricated into apparatus adapted to receive and controllably emit molten material for attenuation into glass fibres.
COMPOSITES. NOVEMBER 1974
Method of forming composite fiber bundle Hicks, J. W. (The Bendix Corp) US Pat 3 779 729 (18 Dec 1973) A method of forming a glass fibre device including the steps of: forming a fibre bundle comprising a plurality of parallel fibres; heating said fibre bundle to a working temperature; while at the working temperature forcing the ends of said bundle towards each other while constraining the ends of the bundle from radial movement in a plane normal to the longitudinal axis of the bundle to form a fused bundle of glass fibres having generally parallel ends of generally, the original corss-section dimension and an outwardly curved bulbous centre section immediately adjacent the ends of the bundle.
Composite fibers of alkali metal hexatitanate and rutile TiO2 Emslie, R. S. (E. I. Du Pont de Nemours and Co) US Pat 3 779 784 (18 Dec 1973)" A fibrous material is provided which is composed of composite fibres having a number average diameter of up to about 10/am and an average length/ diameter ratio of at least about 5/1. The fibres have a core of alkali metal hexatitanate encapsulated by a shell of rutile TiO2 and are essentially inert to aqueous 5% by weight HF solution. The fibrous material is particularly useful in the reinforcing of plastics.
Production of pervious low density carbon fiber reinforced composite articles Park, I. K. (Celanese Corporation) US Pat 3 779 789 (18Dec 1973) The efficient production of pervious low density carbon fibre reinforced composite articles is made possible through the use of the present invention. A fibrous open weave tape (as described) which is capable of undergoing conversations to a carbonaceous fibrous material is continuously passed in the direction of its length through a series of heating zones to form a fibrous carbon tape (preferably of graphitic carbon) wherein an open weave construction is maintained. At least one layer of the resulting fibrous open weave carbon tape may be impregnated with a thermosetting resinous material, and subsequently cured t6 form a pervious composite article. The composite articles of the present invention exhibit a high specific modulus and strength, and are
extremely lightweight. The lightweight composite articles may be utilized as structural elements and are particularly suited for use as a facing sheet of an acoustic sandwich liner which serves as a noise suppression function in jet engines.
Method of fabricating thin graphite reinforced composites of uniform thickness Hertz, J. (General Dynamics Corporation) US Pat 3 779 851 (18Dec 1973) A method of making high strength, low thermal expansion thin composite structures of uniform thickness is disclosed. A plurality of resin inpregnated graphite fibre sheets are laminated together to provide composite preforms. A plurality of the preforms are then bonded together in a pseudoisotropic arrangement between parallel plates. The resulting structures are especially useful as substrates for flat or slightly contoured mirrors.
Method of producing zirconium diffusion barrier in titanium-silicon carbide composite materials McMurray, N. D. and Tumey, M. J. (General Motors Corporation) US Pat 3 779 884 (18 Dec 1973) A composite article, comprising silicon carbide-containing reinforcing filaments in a titanium or titanium alloy matrix, is found to have increased strength when the filaments are initially provided with a thin coating of zirconium. The zirconium acts as a barrier to interdiffusion of titanium and silicon carbide and prevents weakening of the composite structure which would otherwise result from such interdiffusion.
Sizing composition and glass fibers treated therewith Ward, J. E. (Owens-Coming Fiberglas Corporation) US Pat 3 779 981 (18Dec 1973) A sizing for glass fibers, comprising water soluble epoxy resins, an organosilane, polyvinyl acetate copolymer and a lubricant is provided, whereby the sized glass fibres in the form of strands, possess excellent integrity.
Method of dispensing a mixture of resin and expanded thermoplastic spheres Scharfenberger, J. A. (Ransburg Electro-Coating Corp) US Pat 3 780 942 (25 Dec 19 73) A system for and a method of dispen-
281