USA as Represented by Secretary of the Navy

A Silag Inc.

Amarnath P Divecha

William A Ferrando

Subhash D Karmarkar

James M Kerr

Scott M Hoover

Philip W Hesse

William J Bruchey

William A May

Roger E Wilson

Appajosula Srinivasa Rao

Subash Karmarkar

Subhash D Karmarkan

John V Foltz

Gerald Bulmash

A method of producing a novel ceramic foam by treating a commercial ceramic foam with powdered glass in an aqueous/alcohol glass gel and with combined silicon carbide whiskers, where the impregnated foam is dried and sintered to form a porous article.

Preparation of ceramic/glass composites for high temperature structural applications

A method of forming a rhenium layer on a substrate, comprising:

Rhenium composite

A predetermined quantity of a metal-matrix composite material is injected to a heating crucible along an angular infeed direction toward a location therein at which a vortex is formed by the blade of an agitator through which the material is stirred while being superheated above the melting temperature to a pouring temperature under which the melted material is transferred to a casting mold after surface skimming thereof to form a product having improved wear resistance properties.

Fabrication of metal-matrix compositions

Reinforcing particles within a flux are dispersed through a metal matrix osited into a crucible purged of air by infeed of argon gas during heating of the matrix to a melted state for completing particle dispersion by agitation before remelting thereof after solidification. The remelted matrix with the particles fully dispersed therein is then allowed to undergo sedimentation increasing particle concentration along a flat surface portion of the final product having increased wear resistance thereat.

Synthesis of metal matrix composite

Alumina tiles within aluminum framing jigs are fixedly positioned by lock ns within an internally coated mold for centrifugal casting within a block of an aluminum alloy material. Such jigs and the tiles framed therein are coated with silver before casting to prevent aluminum oxidation by heating of the aluminum material to a molten state for deposit into the mold. Bonding of the tiles and framing of the jigs with the aluminum material being cast is also enhanced by such silver coating.

Fabrication of tile reinforced composite armor casting

The article is produced by prepositioning nonwoven reinforcement, coated h a bond enhancing compound inside of a centrifugal casting mold that is surface coated for protective shielding of the reinforcement. Molten matrix metal is then introduced into the mold while being rotated about its longitudinal axis until the molten metal completely encapsulates the reinforcement.

Method of centrifugally casting reinforced composite articles

Silver metal-coated boron carbide (B.sub.4 C) particle reinforce aluminumthium alloy or magnesium-lithium matrix composites which are prepared by coating the B.sub.4 C particles with molten AgNO.sub.3, decomposing the molten AgNO.sub.3 to form a coating of silver metal on the B.sub.4 C particles, mixing the silver coated B.sub.4 C particles into a molten aluminum-lithium alloy or magnesium-lithium alloy matrix, allowing the mixture to cool and solidify the solid composite.

Metal matrices reinforced with silver coated boron carbide particles

A process for producing a superconductor wire by:

Method of producing high temperature superconductor wires

A process for forming pressure cast alumina tile reinforced aluminum alloy rmor in which a silver coated aluminum disc is first inserted into a mold assembly, the mold assembly includes a base plate, a hollow steel die with a removable steel liner located on the base plate, a plug disposed on the base plate within the die cavity, and a punch movably disposed within the die cavity, the aluminum disc being inserted within the die cavity over the plug. Next, an alumina tile preform is prepared by cutting a plurality of alumina tiles and weaving the tiles together with a stiff steel wire. The alumina tile preform is inserted over the silver coated aluminum disc in the cavity of mold assembly. The steel die, the plug and the disc are heated. The punch is also heated separately. A melt of molten aluminum is prepared and poured into the die cavity, completely covering the alumina tile preform. The heated punch is immediately driven into the cavity to apply pressure to the molten aluminum. When the mold assembly cools, the punch is retracted, the base plate is removed, and the composite billet of pressure cast alumina tile reinforced aluminum alloy armor is removed from the mold.

Pressure cast alumina tile reinforced aluminum alloy armor and process

A process for producing a lightweight electrode grid by exposing a compred, heated mat of dense graphite fibers to Ni(CO).sub.4 gas wherein the Ni(CO).sub.4 decomposes upon contact with the graphite fibers depositing a nickel metal coating on the graphite fibers which strongly bonds the fibers together to form a compressed mat or grid of nickel metal coated fibers.

Lightweight battery electrode and method of making it

The article is produced by prepositioning nonwoven reinforcement made of a etallic mesh to which ceramic tiles are wired inside of a centrifugal casting mold. Molten matrix metal is then introduced into the mold while being rotated about an axis parallel to the inflow path of the molten metal until it completely encapsulates the reinforcement.

A Nb-Ti or Nb-Zr low temperature superconducting (LTS) wire is coat with ten AgN0.sub.3 which is then decomposed to form a uniform silver metal (Ag) coating on the LTS wire. A uniform coating of molten Al or Al alloy is formed on the Ag coated LTS wire and then solidified. A bundle of the coated LTS wires is inserted into an Al or Al alloy tube and cold worked to form a multifilamentary LTS cable comprising the Ag coated LTS wires each surrounded by an Al or Al alloy matrix.

Multifilamentary superconducting cable and a method of manufacturing it

A thin layer of silver metal is formed between a molybdenum surface and a eel surface. The silver metal layer is diffusion bonded to the molybdenum surface and diffusion bonded to the steel surface, thus bonding the molybdenum and steel surfaces together.

Method of bonding molybdenum to steel

A high temperature superconducting wire or yarn has a first layer thereon yttria, a third layer of barium cuprate, and a second layer of a superconducting YBa.sub.2 Cu.sub.3 O.sub.7-x formed at the interface between the first and third layers. The wire can be yttrium and the yarn can be alumina.

Superconducting fibers made with yttrium and yttrium oxide interlayers

A composite reinforced gun barrel with a composite of a titanium, nickel, FeCrAlY alloy matrix reinforced with round filaments or rectangular ribbons made of molybdenum or tungsten. The composite layer may be bonded directly onto the barrel or it may be bonded to a steel jacket which can then be heat shrunk onto an existing gun barrel.

Growing community of inventors

Falls Church, VA, United States of America

Amarnath P Divecha