摘要:
Process for producing superconducting metal-oxide textiles comprising impregnating a preformed, organic textile material with metal compounds in a desired atomic ratio, heating the material in a weakly oxidizing atmosphere to pyrolize and oxidize the organic material, maintaining the material at temperature in an oxidizing atmosphere, and cooling the material in an oxidizing atmosphere, so as to form a crystalline structure capable of superconducting.
摘要:
A method of the production of the ceramic superconductor filament comprisesa step including mixing raw materials of ceramic superconductor, subsequently shaping the mixed ceramic superconductor into a ceramic superconductor body of a predetermined shape and preliminarily sintering thereof and further subsequently crushing the sintered ceramic superconductor body into ceramic superconductor powder;a step of filling the ceramic superconductor powder in a glass tube;a step of heating the glass tube including ceramic superconductor powder so that the ceramic superconductor powder is molten; anda step of spinning the glass tube including the ceramic superconductor materialwhereby a ceramic super conductor covered with the glass material can be obtained.
摘要:
A method for forming elongated articles including metallic oxide superconductor material by hydrostatic extrusion at temperatures less than about 800.degree. C., and even at temperatures less than about 450.degree. C. The method includes providing superconductive core material that is substantially free of carbon or organic additives and that has an equivalent density at least about 55% of full density, and enclosing the densified material in a metal container, to become a cladding, prior to extrusion. In a preferred embodiment, the cladding material is a dispersion hardened metal or metal alloy.
摘要:
A method of forming a superconducting tape having a silver sheath and a polycrystalline oxide superconductor core includes, forming at least one silver foil to have a receiving surface for supporting a deposit, and at least one enclosing surface that can cover the deposit and overlap another portion of the foil so that the surfaces form the sheath. The foil has a first thickness at the receiving surface and a second thickness at the enclosing surface. A precursor deposit of the superconductor is formed on the receiving surface. The enclosing surface is wrapped to cover the deposit and overlap another portion of the foil to form the sheath. The first and second thicknesses being preselected so that the thickness of the overlapping foils is equivalent to the thickness of foil oppositely facing the overlapping foils. The overlapping foils are sealed, and annealed to reaction-sinter the sealed deposit and form the tape.
摘要:
A method for forming a high T.sub.c metal oxide superconductor in the form of a hollow fiber. The method includes the steps of: forming a polymer-metal complex precursor; filling a decomposable hollow fiber mold with the precursor; and heating the filled mold to decompose the mold and convert the precursor to a metal oxide superconductor in the form of a hollow fiber. Ag-doped metal oxide superconductor structures can also be produced by the above method.
摘要:
A method of making high T.sub.c 1-2-3 superconductors having perovskite structure using solution techniques is disclosed. The process uses two solvent systems to form a resinous preceramic material having a controlled viscosity for facilitating its formation into superconducting articles such as fibers, wires, ribbons, films and the like. The process yields a pre-ceramic which is flexible and which has sufficient structural integrity to withstand normal handling.
摘要:
In a known process, oxide powders derived from the four-component systems yttrium-barium-copper-oxygen or lanthanum-strontium-copper-oxygen are mixed, pressed, sintered, ground and then heat-treated to produce a superconducting material which can be shaped to the desired cross-section. According to the invention, the powder is compacted by isostatic pressing and the blank so obtained is extruded at a temperature.gtoreq.500.degree. C. to form a metallic sheath with a deformation ratio of at least 50%. The extruded blank is then converted to wire or strip. The current-carrying capacity of the high-temperature superconductor is improved by the extrusion and the resulting alignment of the crystallites. The process can be implemented using known high-temperatures superconducting material.
摘要:
A method is provided for making a flexible superconductive composite wire by drawing a wire of noble metal through a melt formed from solid superconducting material. The preferred superconducting material comprises the Bi-Sr-Ca-Cu-O class of materials.
摘要:
A method of producing a superconductor including a superconductive oxide. At least one material is pressed for forming a filling material, the at least one material being selected from the group consisting of a starting material powder of the superconductive oxide, a powder of the superconductive oxide and a compact made of the starting material powder and/or the superconductive oxide powder, for forming a filling material. The filling material is charged into a metallic pipe to form a preform. The preform is moved along an axis thereof. During moving, the preform is swaged perpendicularly to the axis thereof to form a composite having a metallic sheath, made of the metallic pipe, and a core sheathed with the metallic sheath. The core of the composite is heated for producing the superconductive oxide.
摘要:
Bi.sub.2 Sr.sub.2 Ca,Cu.sub.2 2212 superconductive oxide fiber having enhanced current carrying capacity is prepared by forming an intimate mixture of the Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 superconductive oxide precursors or their functional equivalents, firing the mixture at a temperature of at least 400.degree. C. but below the melting point of the superconductive oxide, dispersing the fired mixture in an organic binder, extruding the dispersion as fiber extrudate, firing the fiber at a temperature sufficient to cause the organic binder to burn off and to cause melting of the superconductive oxide while substantially retaining the filamentary shape, and then cooling the fiber.