Patents by Inventor Joseph S. Armijo

Joseph S. Armijo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5524032
    Abstract: A cladding tube having a cross-section and including (1) a zirconium alloy outer circumferential substrate having an inner surface and having one or more alloying elements, (2) a zirconium barrier layer bonded to the inner surface of the outer circumferential substrate and being alloyed with the one or more alloying elements, and (3) a zirconium alloy inner circumferential liner bonded to the inner surface of the zirconium barrier layer. The barrier layer will have a concentration profile including a diffusion layer extending from the barrier layer's inner surface (facing nuclear fuel) to the barrier layer's interior (between the barrier layer's inner and outer surfaces). At the interior edge of the diffusion layer, there will be substantially no alloying elements. At the outer edge of the diffusion layer (the barrier layer's inner surface), the maximum concentration of alloying elements will occur.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: June 4, 1996
    Assignee: General Electric Company
    Inventors: Ronald B. Adamson, Daniel R. Lutz, Joseph S. Armijo, Herman S. Rosenbaum
  • Patent number: 5517541
    Abstract: The present invention provides a cladding having an outer circumferential substrate, a zirconium barrier layer metallurgically bonded to the inside surface of the substrate and an inner circumferential liner metallurgically bonded to the zirconium barrier. The inner circumferential liner is more ductile than conventional Zircaloy. The low ductility of the inner circumferential liner is obtained, for example, by using a zirconium alloy containing a low tin content (e.g. less than 1.2% by weight) and/or a low oxygen content (e.g. less than 1000 ppm). The inner circumferential liner is less than about 25 micrometers thick.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: May 14, 1996
    Assignee: General Electric Company
    Inventors: Herman S. Rosenbaum, Joseph S. Armijo
  • Patent number: 5517540
    Abstract: A method is provided for preparing a cladding tube having an outer substrate, an intermediate zirconium barrier layer, and an inner liner. The method includes the following steps: (a) bonding an inner liner alloy sheath exterior circumferential surface to a zirconium sheath interior circumferential surface to form a barrier/inner liner sheath, and (b) bonding the exterior surface of the zirconium sheath on the barrier/inner liner sheath to the interior circumferential surface of an outer substrate alloy tube to form the cladding tube. Alternatively, the method includes the following steps: (a) bonding the zirconium sheath exterior circumferential surface to the outer substrate alloy tube interior circumferential surface to form a substrate tube/barrier sheath, and (b) bonding the exterior circumferential surface of the inner liner alloy sheath to the interior circumferential surface of the zirconium sheath of the substrate tube/barrier sheath to form said cladding tube.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: May 14, 1996
    Assignee: General Electric Company
    Inventors: Mickey O. Marlowe, Joseph S. Armijo, Cedric D. Williams, Herman S. Rosenbaum
  • Patent number: 5469481
    Abstract: A method is provided for forming a three-layer cladding tube having an outer substrate, a zirconium barrier layer, and an inner liner having alloying elements, in which the zirconium barrier layer (located between an outer substrate and inner liner) is at least partially alloyed with alloying elements that impart resistance to corrosion. The barrier layer has a diffusion layer extending from its inner surface (facing the fuel) to the barrier layer's interior (the interior being defined between the barrier layer's inner and outer surfaces). At the interior edge of the diffusion layer, there will be substantially no alloying elements beyond those normally present in zirconium. The methods of forming such structure include a diffusion anneal of a three-layer cladding in the range of 650.degree.-1000.degree. C. for times between about 1 minute and 20 hours. This anneal drives some of the alloying elements from the inner liner into the zirconium barrier layer to form the diffusion layer.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: November 21, 1995
    Assignee: General Electric Company
    Inventors: Ronald B. Adamson, Daniel R. Lutz, Joseph S. Armijo
  • Patent number: 5383228
    Abstract: The present invention provides a cladding having an outer circumferential substrate, a zirconium barrier layer metallurgically bonded to the inside surface of the substrate and an inner circumferential liner metallurgically bonded to the zirconium barrier. The inner circumferential liner is more ductile than conventional Zircaloy. The low ductility of the inner circumferential liner is obtained by using a zirconium alloy containing a low tin content (e.g. less than 1.2% by weight) and/or a low oxygen content (e.g. less than 1000 ppm). The inner circumferential liner is less than about 25 micrometers thick.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: January 17, 1995
    Assignee: General Electric Company
    Inventors: Joseph S. Armijo, Herman S. Rosenbaum, Cedric D. Williams
  • Patent number: 5341407
    Abstract: The present invention provides a cladding having an outer circumferential substrate, a zirconium barrier layer metallurgically bonded to the inside surface of the substrate and an inner circumferential liner metallurgically bonded to the zirconium barrier. The inner circumferential liner is more ductile than conventional Zircaloy. The low ductility of the inner circumferential liner is obtained, for example, by using a zirconium alloy containing a low tin content (e.g. less than 1.2% by weight) and/or a low oxygen content (e.g. less than 1000 ppm). The inner circumferential liner is less than about 25 micrometers thick.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: August 23, 1994
    Assignee: General Electric Company
    Inventors: Herman S. Rosenbaum, Joseph S. Armijo
  • Patent number: 4659540
    Abstract: An improved method for producing nuclear fuel containers of a composite construction having components providing therein a barrier system for resisting destructive action by volatile fission products or impurities and also interdiffusion of metal constituents, and the product thereof. The composite nuclear fuel containers of the method comprise a casing of zirconium or alloy thereof with a layer of copper overlying an oxidized surface portion of the zirconium or alloy thereof.
    Type: Grant
    Filed: February 9, 1984
    Date of Patent: April 21, 1987
    Assignee: General Electric Company
    Inventors: Bo-Ching Cheng, Herman S. Rosenbaum, Joseph S. Armijo
  • Patent number: 4445942
    Abstract: An improved method for producing nuclear fuel containers of a composite construction having components providing therein a barrier system for resisting destructive action by volatile fission products or impurities and also interdiffusion of metal constituents, and the product thereof. The composite nuclear fuel containers of the method comprise a casing of zirconium or alloy thereof with a layer of copper overlying an oxidized surface portion of the zirconium or alloy thereof.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: May 1, 1984
    Assignee: General Electric Company
    Inventors: Bo-Ching Cheng, Herman S. Rosenbaum, Joseph S. Armijo
  • Patent number: 4372817
    Abstract: A nuclear fuel element for use in the core of a nuclear reactor is disclosed and has a composite cladding having a substrate and a metal barrier metallurgically bonded on the inside surface of the substrate so that the metal barrier forms a shield between the substrate and the nuclear fuel material held within the cladding. The metal barrier forms about 1 to about 30 percent of the thickness of the cladding and is comprised of a low neutron absorption metal of substantially pure zirconium. The metal barrier serves as a preferential reaction site for gaseous impurities and fission products and protects the substrate from contact and reaction with such impurities and fission products. The substrate of the composite cladding is selected from conventional cladding materials and preferably is a zirconium alloy. Methods of manufacturing the composite cladding are also disclosed.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: February 8, 1983
    Assignee: General Electric Company
    Inventors: Joseph S. Armijo, Louis F. Coffin, Jr.
  • Patent number: 4200492
    Abstract: A nuclear fuel element for use in the core of a nuclear reactor is disclosed and has an improved composite cladding comprised of a moderate purity metal barrier of zirconium metallurgically bonded on the inside surface of a zirconium alloy tube. The metal barrier forms a shield between the alloy tube and a core of nuclear fuel material enclosed in the composite cladding. There is a gap between the cladding and the core. The metal barrier forms about 1 to about 30 percent of the thickness of the composite cladding and has low neutron absorption characteristics. The metal barrier serves as a preferential reaction site for gaseous impurities and fission products and protects the alloy tube from contact and reaction with such impurities and fission products. Methods of manufacturing the composite cladding are also disclosed.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: April 29, 1980
    Assignee: General Electric Company
    Inventors: Joseph S. Armijo, Louis F. Coffin, Jr.