Abstract:
Highly-textured superconductor oxide thin films are prepared on substrates, including lattice matched, non-lattice matched, inert and non-inert materials, by metal organic deposition (MOD). Precursor solution composition, as well as processing temperature and atmosphere are selected to control the presence of a transient liquid phase. Superconductor oxide films characterized by highly textured morphologies and fully dense, homogeneous microstructures are capable of sustaining critical current densities in excess of 104 A/cm2 at 77 K when prepared on non-lattice matched substrates or critical current densities in excess of 106 A/cm2 at 77 K when prepared on lattice-matched substrates.
Abstract:
An apparatus for the coating of substrates using chemical vapor deposition in which low vapor pressure reactants are used comprising a powder feeder means (12) or atomizer feeder means (112) which is used to introduce the reactants into a chemical vapor deposition furnace (50); the entire apparatus being useful for coating substrate using chemical vapor deposition in which low vapor pressure reactants are used, comprising the steps of providing a substrate (52) and a quantity of one or more reagents, placing the substrate within the furnace, introducing the reactants into and reacting the reactants within the furnace resulting in the deposition of a coating consisting essentially of the reactant components on the substrate; said reagents generally chosen to yield the group of oxide superconductors.
Abstract:
A method is provided to apply a coating of a superconducting ceramic oxide to a substrate comprising introducing an atomized aqueous solution comprising at least three metal salts into inductively coupled plasma to deposit a mixed metal oxide on the substrate, which is converted into a superconductive ceramic oxide by post-annealing.
Abstract:
A method for depositing from the vapor phase a chemical species into the form of a thin solid film material which overlays a substrate material. The deposition process consists of three steps: (1) synthesis of depositing species, (2) transport of said species from site of synthesis to a prepared substrate material, and (3) condensation and subsequent film growth. The transparent step is achieved by admixing small concentrations of the depositing species into the flow of a high speed jet of an inert carrier gas. This jet impinges on the substrate's surface thereby convects the depositing species to this surface where condensation occurs. Since the gas mixture is at fairly high pressure, the deposition is achieved in a simple flow apparatus rather than in the high vacuum systems required of other methods. Also this transport technique allows the chemical and/or physical phenomena utilized in the depositing species synthesis step to be isolated from the actual condensation reaction. Consequently, the conditions governing each of these reactions can be varied independently to optimize both steps. Such flexibility permits the synthesis and deposition of a wide variety of chemical species, hence many thin film materials are susceptible to formation by this method.
Abstract:
A catalytic electrode has an electrically conductive substrate such as titanium with a coating comprising a platinum-group metal catalyst finely dispersed in a matrix consisting of a semi-conducting polymer formed in situ on the substrate. The catalyst may be a platinum-group metal oxide such as iridium oxide formed in situ together with the semi-conducting polymer by the application of a uniform liquid mixture followed by a controlled heat treatment. The semi-conducting polymer is preferably formed from polyacrylonitrile, polybenzimidazo-pyrrolone or an adamantane based polybenzoxazole.
Abstract:
An improved thermionic generator constructed using microengineering techniques is described. This device is easy to construct in large numbers, efficient, and inexpensive. A preferred thermionic converter cell (14) uses a micromachined silicon wafer (1) having a depression (3) surrounded by an edge region (4). The floor of the depression (3) is doped to form a doped region (7) on which a coating (8) is formed. The preferred coating is silver which is oxidized and cesiated. Tungsten may also be used for the coating which is then thoriated. These cells (14) may be joined together at the edge regions (4) in large arrays to form a thermionic generator.
Abstract:
Ductile superconducting alloy NbTi sheets (1) are layered with transition metal Ta mesh (2) to produce a stack (3). The stack (3) is inserted into a copper can (4) along with a diffusion barrier (5). The resulting composite is then processed by a plurality of reduction and heat treatments to generate flux pinning sites within the superconducting alloy regions in order to obtain enhanced Jc and Hc2.
Abstract:
A conductive wire coated with an improved electrical insulation and methods for the preparation of same. The methods involve coating a conductive wire with an insulating material that comprises a curable acrylate-modified aminoamide resin. The insulated conductive wires possess highly desirable properties, including, for example, desirable dielectric strength, heat-resistance, flexibility, mechanical properties and/or uniformity.
Abstract:
A welding rod with a water resistant coating (14), and a method of making the same, is disclosed. To the surface of the welding rod is applied one or more coatings (14) comprising a plurality of metallic flakes and an organic binding agent which adheres the coating (14) to the electrode covering (12) on surfaces of the welding rod (10) and imparts the water resistance. The coating may comprise a thermoset phenolic resin and metallic flakes with an average particle size between 12 and 25 microns.
Abstract:
A method of making a three-dimensional printed circuit assembly is disclosed. A substrate (20) is first formed from a photoactive polymer (14) that is capable of altering its physical state when exposed to a radiant beam (30). At this point, the substrate (20) is only partially cured. A conductive circuit pattern is then formed on the partially cured substrate (20). The substrate (20) is then molded to create a three-dimensional structure, and then further cured to cause the photoactive polymer (14) to harden.