Abstract: An electrochemical cell is described, including an anodic chamber and a cathodic chamber separated by an electrolyte separator tube, all contained within a cell case. The cell also includes an electrically insulating ceramic collar positioned at an opening of the cathodic chamber, and defining an aperture in communication with the opening; along with a cathode current collector assembly; and at least one metallic ring that has a coefficient of thermal expansion (CTE) in the range of about 3 to about 7.5 ppm/° C., contacting at least a portion of a metallic component within the cell, and an adjacent ceramic component. An active braze alloy composition attaches and hermetically seals the ring to the metallic component and the collar. Sodium metal halide batteries that contain this type of cell are also described, along with methods for sealing structures within the cell.

Abstract: A cathode composition is presented. The cathode composition includes an alkali metal halide and an electroactive metal. The electroactive metal includes a first population of particles that is present in a range at least about 50 weight percent of a total weight of the electroactive metal. A specific surface area of the first population of particles is lower than 0.2 m2/g. An electrochemical cell and an energy storage system including the cathode composition are also presented.

Abstract: An electrochemical cell is described, including an anodic chamber and a cathodic chamber separated by an electrolyte separator tube, all contained within a cell case. The cell also includes an electrically insulating ceramic collar positioned at an opening of the cathodic chamber, and defining an aperture in communication with the opening; along with a cathode current collector assembly; and at least one metallic ring that has a coefficient of thermal expansion (CTE) in the range of about 3 to about 7.5 ppm/° C., contacting at least a portion of a metallic component within the cell, and an adjacent ceramic component. An active braze alloy composition attaches and hermetically seals the ring to the metallic component and the collar. Sodium metal halide batteries that contain this type of cell are also described, along with methods for sealing structures within the cell.

Abstract: A composition includes a metal precursor. The metal precursor may include an inorganic ligand and a metal cation. The inorganic ligand may include a carbamate group. An associated method is provided.

Abstract: A composition includes a metal precursor. The metal precursor may include an inorganic ligand and a metal cation. The inorganic ligand may include a carbamate group. An associated method is provided.

Abstract: A method for forming a nanocomposite material and articles made with the nanocomposite material are presented.

Abstract: A method for forming a nanocomposite material and articles made with the nanocomposite material are presented.

Abstract: A composition includes a decomposition product of a metal precursor. The metal precursor may include a carbamate, and a metal cation. The decomposition product may include a metal nanoparticle. An associated method is provided.

Abstract: A method for mitigating stress corrosion cracking of a component exposed to a high temperature water in a high temperature water system is provided. The method comprises the steps of lowering corrosion potential conditions to a desired low corrosion potential in the high temperature water environment; and introducing a first material comprising zinc into the high temperature water environment, such that the desired low corrosion potential facilitates transport of the first material into cracks in a structure communicative with the high temperature water environment.

Abstract: A method for forming a nanocomposite material and articles made with the nanocomposite material are presented.

Abstract: A process for mitigating stress corrosion cracking of steam turbine components in a steam environment, includes coating the metal components of the steam turbine with a noble metal. The noble metal is preferably a platinum group metal selected from the group consisting of platinum, palladium, osmium, rhodium, ruthenium, iridium, and combinations comprising at least one of the foregoing platinum group metals. In another embodiment, the process comprises coating the metal components with a platinum group metal and introducing a reductant into the steam to mitigate the stress corrosion cracking. Also disclosed herein is a steam turbine comprising a metal component having a surface coated with a platinum group metal.

Abstract: A method and system for reducing stress corrosion cracking in a hot water system, such as a nuclear reactor, by reducing the electrochemical corrosion potential of components exposed to high temperature water within the structure. The method includes the steps of: providing a reducing species to the high temperature water; and providing a plurality of noble metal nanoparticles having a mean particle size of up to about 100 nm to the high temperature water during operation of the hot water system. The catalytic nanoparticles, which may contain at least one noble metal, form a colloidal suspension in the high temperature water and provide a catalytic surface on which a reducing species reacts with least one oxidizing species present in the high temperature water. The concentration of the oxidizing species is reduced by reaction with the reducing species on the catalytic surface, thereby reducing the electrochemical corrosion potential of the component.

Abstract: A method for mitigating stress corrosion cracking in high temperature water includes introducing catalytic nanoparticles and dielectric nanoparticles to the high temperature water in an amount effective to reduce a electrochemical corrosion potential of the high temperature water.

Abstract: A method for forming a nanocomposite material and articles made with the nanocomposite material are presented.

Abstract: A brush seal is provided wherein the brush seal is disposed in a section of a steam turbine for reducing leakage of a working fluid across a pressure drop. The brush seal comprises a bristle holder attachable to the steam turbine and a plurality of bristles comprising Ni, Cr, Mo, Fe, W, Mn, V, Si, and C.

Abstract: A method and system for reducing stress corrosion cracking in a hot water system, such as a nuclear reactor, by reducing the electrochemical corrosion potential of components exposed to high temperature water within the structure. The method comprises the steps of: providing a reducing species to the high temperature water; and providing a plurality of noble metal nanoparticles having a mean particle size of up to about 100 nm to the high temperature water during operation of the hot water system. The catalytic nanoparticles, which may comprise at least one noble metal, form a colloidal suspension in the high temperature water and provide a catalytic surface on which a reducing species reacts with least one oxidizing species present in the high temperature water. The concentration of the oxidizing species is reduced by reaction with the reducing species on the catalytic surface, thereby reducing the electrochemical corrosion potential of the component.

Abstract: A dispersion strengthening method for metallic melts that are used to form large articles. The method comprises adding nanophase particles into a molten metallic melt and dispersing the nanophase particles in the metallic melt. The nanophase particles comprising particles with diameters in the range of about 5 nanometers to about 100 nanometers. The step of dispersing the nanophase particles in the metallic melt spaces the particles from each other with an average interparticle spacing (IPS) in a range from about 10 nanometers to about 500 nanometers.

Abstract: A steel comprises additives including rare earth elements, boron and at least one of rhenium, osmium, iridium, ruthenium, rhodium. The steel exhibits resistance to embrittlement, oxidation and creep. The steel also comprises balanced amounts of nickel and cobalt to minimize a ratio of nickel to cobalt, and optimize aging embrittlement resistance with as tempered toughness. The steel comprises, by weight percent: at least one of rhenium, osmium, iridium, ruthenium, rhodium (0.01 to 2.00); rare earth element (0.50 max.); boron (0.001-0.04); carbon (0.08-0.15); silicon (0.01-0.10); chromium (8.00-13.00); at least one of tungsten and molybdenum (0.01 to 2.00); at least one austenite stabilizer; such as nickel, copper, cobalt and manganese (0.001-6.00); vanadium (0.25-0.40); phosphorus (0.010 max.); sulfur (0.004 max.); nitrogen (0.060 max.); hydrogen (2 ppm max.); oxygen (50 ppm max.); aluminum (0.001-0.025); arsenic (0.0060 max.); antimony (0.0030 max.); tin (0.0050 max.); iron (balance).

Abstract: A stainless steel comprises additives including at least one of rare earth elements and boron, so as to exhibit resistance to long term aging embrittlement. The stainless steel also contains balanced amounts of nickel and cobalt to minimize a ration of nickel to cobalt and optimize aging embrittlement resistance with as tempered toughness. The remainder of the stainless steel comprising, by weight percentage:______________________________________ Carbon 0.08-0.15 Silicon 0.01-0.10 Chromium 8.00-13.00 At least one of Tungsten and Molybdenum 0.50-4.00 At least one Austenite stabilizer, 0.001-6.00 such as Nickel, Cobalt, Manganese and Copper Vanadium 0.25-0.40 Phosphorus 0.010 max. Sulfur 0.004 max. Nitrogen 0.060 max. Hydrogen 2 ppm max. Oxygen 50 ppm max. Aluminum 0.001-0.025 Arsenic 0.0060 max. Antimony 0.0030 max. Tin 0.0050 max. Iron Balance.