| Pressure Cast Alumina Tile Reinforced Aluminum Alloy Armor and Process for Producing the Same. |
23 APR 1996 |
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| Authors:
Amarnath P. Divecha; Subhash D. Karmarkar; Scott M. Hoover; James M. Kerr; William A. Ferrando; DEPARTMENT OF THE NAVY WASHINGTON DC
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 | A process for forming pressure cast alumina tile reinforced aluminum alloy armor 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 ... |
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| Lightweight Battery Electrode and Method of Making it. |
08 NOV 1994 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A process for producing a lightweight electrode grid by exposing a compressed, heated mat of dense graphite fibers to Ni(CO)4 gas wherein the Ni(CO)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. jg |
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| Method of Centrifugally Casting Reinforced Composite Articles. |
16 AUG 1994 |
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| Authors:
Amarnath P. Divecha; Subhash D. Karmarkar; William A. Ferrando; Scott M. Hoover; DEPARTMENT OF THE NAVY WASHINGTON DC
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| The article is produced by prepositioning nonwoven reinforcement made of a metallic 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. |
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| Multifilamentary Superconducting Cable and a Method of Manufacturing It. |
16 NOV 1993 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; James Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A Nb-Ti or Nb-Zr low temperature superconducting (LTS) wire is coat with molten AgNO3 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 ... |
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| Superconducting Fibers Made with Yttrium and Yttrium Oxide Interlayers and Barium Cuprate Cover Layers. |
19 OCT 1993 |
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| Authors:
Amarnath P. Divecha; James M. Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A high temperature superconducting wire or yarn has a first layer thereon of yttria, a third layer of barium cuprate, and a second layer of a superconducting YBa2CU307-x formed at the interface between the first and third layers. The wire can be yttrium and the yarn can be alumina. |
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| Method of Bonding Molybdenum to Steel. |
19 OCT 1993 |
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| Authors:
William A. Ferrando; Subhash D. Karmarkar; Scott M. Hoover; Amarnath P. Divecha; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A thin layer of silver metal is formed between a molybdenum surface and a steel 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. |
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| Microstructurally Toughened Articles and Casting Thereof. |
02 JUN 1993 |
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| Authors:
Amarnath P. Divecha; Subhash D. Karmarkar; Philip Hesse; W. Brouchy; DEPARTMENT OF THE NAVY WASHINGTON DC
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| The present invention relates in general to articles reinforced with discontinuous composites and the like, and a process of making the same. In particular, the invention relates to the use of reinforcement preforms in microstructurally toughened articles formed by casting as disclosed in the application |
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| Composite Reinforced Gun Barrels. |
25 MAY 1993 |
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| Authors:
Amarnath P. Divecha; Subbash D. Karmarkar; Scott M. Hoover; William A. Ferrando; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A composite reinforced gun barrel with a composite of a titanium, nickel, or FeCrA1Y 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. |
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| Lightweight Battery Electrode and Method of Making It. |
30 MAR 1993 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A process for producing a lightweight electrode grid by exposing a heated mat of dense graphite fibers to Ni(CO)4 gas wherein the Ni(CO)4 decomposes upon contact with the graphite fibers depositing nickel metal coating on the graphic fibers. The nickel coated graphite fibers are then sintered to form the grid. Nickel or cadmium electrodes are made by attaching a current collector to the grid and impregnating the grid with the ... |
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| Techniques For Preparation of Ingot Metallurgical Discontinuous Composites. |
16 MAR 1993 |
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| Authors:
Amarnath P. Divecha; Subhash D. Karmarkar; William A. Ferrando; Scott M. Hoover; James M. Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| Process for the production of ingots of castable discontinuous metal matrix composites by encapsulating particulate refractory material of the B4C or SiC in a matrix metal of Li or Al to form a solid master alloy, and introducing the master alloy into molten Mg or an alloy thereof, mixing and then cooling to solidify the resultant mixture and form an ingot with the refractory material substantially dispersed in the ingot. ... |
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| Method of Producing High Temperature Superconductor Wires. |
20 JUL 1992 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; James Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| This patent application discloses a process for producing a superconductor wire by: (a) coating the inner surface of a steel tube with a thin layer of silver metal; (b) packing the tube with high temperature superconductor ceramic (HTSC) powder; (c) sealing the tube; (d) cold working the tube to reduce its diameter; and (e) etching or dissolving away the steel tube to leave a superconductor wire comprising the silver metal ... |
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| Multifilamentary Superconducting Cable and a Method of Manufacturing it. |
07 JUL 1992 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; James Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A Nb-Ti or Nb-Zr low temperature superconducting (LTS) wire is coat with molten AgNO3 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 ... |
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| Silver Lined Ceramic Vessel and Method of Preparation. |
09 JUN 1992 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; James Kerr; COURTNEY AND CO PHILADELPHIA PA
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| A reaction vessel comprising (1) a porous ceramic structure having interconnecting, open pores and (2) silver metal coating the inner ceramic surfaces of the reaction vessel and filling the interconnecting, open pores to form a strong bond between the porous ceramic structure and the silver coating. The reaction vessel can be produced by (1) coating the inner surface and infiltrating the continuous, open pores of an unglazed porous ceramic structure ... |
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| Method of Bonding Carbon-Carbon and Metal Matrix Composite Structures. |
31 MAR 1992 |
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| Authors:
Amarnath P. Divecha; William A. Ferrando; Philip W. Hesse; Subhash D. Karmarkan; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A method of bonding two carbon/carbon composite pieces or a carbon/carbon composite piece and a graphite/aluminum metal matrix composite piece together by (1) forming a uniform coating of molten AgNO3 on the surfaces to be bonded at a temperature above the melting point of AgNO3 but below the decomposition temperature of AgNO3; (2) placing the molten AgNO3 coated surfaces to be bonded into contact with each other; (3) decomposing the ... |
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| Process for Producing Uniform Protective Coating of Silver Metal on Carbon/Carbon Composites. |
24 SEP 1991 |
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| Authors:
Amarnath P. Divecha; William A. Ferrando; Philip W. Hesse; Subhash D. Karmarkar; DEPARTMENT OF THE NAVY WASHINGTON DC
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| This patent discloses a process for producing high temperature, oxidation resistant silver metal coatings on carbon/carbon composite structures by coating the carbon/carbon surfaces with molten silver nitrate at a temperature above the melting point of AgNO3 but below the decomposition temperature of AgNO3, and then heating the resulting uniform coating of molten AgNO3 at a temperature of from the decomposition temperature of AgNO3 to about 700 C, to decompose the ... |
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| Centrifugal Casting of Composites. |
25 JUN 1991 |
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| Authors:
Subhash D. Karmarkar; Amarnath P. Divecha; DEPARTMENT OF THE NAVY WASHINGTON DC
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| This patent discloses tubes or other symmetrical shapes are formed of composite materials, such as silicon carbide and aluminum, by spin casting. The reinforcing material can be precast into a billet or bar of the matrix metal, remelted and introduced into a spinning mold. Tubes can be produced with walls having differing amounts of reinforcing materials in the tube wall. Castings can be obtained having a uniform distribution of a ... |
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| Silver Lined Ceramic Vessel and Method of Preparation. |
10 MAY 1991 |
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| Authors:
William A. Ferrando; Amarnath P. Divecha; James Kerr; DEPARTMENT OF THE NAVY WASHINGTON DC
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| This invention relates to reaction vessels and more particularly high temperature reaction vessels having inert metal surfaces. Many of the component elements, oxides and nitrates used in synthesizing high temperature superconductor (HTS) compounds (and perhaps other classes of compounds) tend to react with most containment vessels during the high temperature processing required to form or sinter the materials. The noble metals are the only materials which remain essentially non-reactive under ... |
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| Method of Soldering Aluminum. |
25 SEP 1990 |
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| Authors:
Amarnath P. Divecha; William A. Ferrando; Philip W. Hesse; Subhash D. Karmarkar; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An aluminum or aluminum alloy surface is coated with molten AgNO3, the silver nitrate is decomposed (at about 450 C-550 C) leaving a thin layer of silver metal, and then an inter-diffusion layer of silver and aluminum is formed (at about 570 C-660 C). The treated surface can be soldered by conventional means. Molten AgNO3 (MP 212 C) is coated on to the aluminum or aluminum alloy surface which is ... |
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| Silicon Carbide Whisker-Metal Matrix Composites. |
MAY 1969 |
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| Authors:
Amarnath P. Divecha; Paul J. Lare; Henry Hahn; MELPAR FALLS CHURCH VA
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Reports by Author
