67 results about "Flux pinning" patented technology

The invention relates to a preparation method of a single domain yttrium barium copper oxide superconductor; and the preparation method comprises the following steps: preparing Y2BaCuO5 precursor powder and liquid phase source powder, pressing a Y2BaCuO5 precursor block, a liquid phase block and a supporting bock, preparing a green body, growing a single domain yttrium barium copper oxide block in an infiltration manner, and carrying out oxygen permeation processing. A second phase nanoparticle Y2Ba4CuBiOx/Y2Ba4CuMOx (M is Bi or W) is successfully introduced for forming a flux pinning center by adopting a top seed crystal infiltration growing method and adding a metallic oxide (Bi2O3 powder and WO3 powder) for doping, thereby the powder preparation technology is simplified, the experimental period is shortened, the experiment cost is reduced, and the flux pinning capacity of the superconductor is increased. Y2O3 is used for preparing the supporting block which stably supports two briquettes above the supporting block in the slow cold growing process of an yttrium barium copper oxide block so as to prevent liquid phase from running off. The preparation method can be used for preparing the yttrium barium copper oxide superconductor and can also be used for preparing high-temperature superconductors of other series such as Gd, Sm, Nd, Eu and the like.

A process and composition of matter are provided and involve flux pinning in thin films of high temperature superconductive oxides such as YBCO by inclusion of particles including barium and a group 4 or group 5 metal, such as zirconium, in the thin film.

Nanometer-sized non-superconducting particulates in superconductive REBCO films, where RE is a rare earth metal, for flux pinning enhancement and a method of forming are disclosed. A target with a second phase material sector portion and a superconductive material portion is used in a pulse laser deposition process to form films on substrates according to the present invention. The films consist of 10-20 nm-sized precipitates. In a 0.5 μm thick film, a transport critical current density (J_c)>3 MA/cm² at 77K in self-field was measured. In one embodiment, magnetization J_c at 77 K and 65K showed significant improvements in a composite YBCO films with fine precipitates produced according to the present invention as compared to non-doped (standard) YBCO films (>10 times increase at 9 T, 65 K).

A method of making a superconducting article that involves using MOCVD to deposit onto a uniaxially or biaxially textured surface an epitaxial layer that includes a superconducting material such as REBa₂Cu₃O₇ and a secondary phase comprising at least one dopant, the dopant including Nb, Ta and/or V, or combinations thereof.

A superconducting article comprises a substrate, a buffer layer overlying the substrate, and a high-temperature superconducting (HTS) layer overlying the buffer layer. The HTS layer includes a plurality of nanorods. A method of forming a superconducting article comprises providing a substrate, depositing a buffer layer overlying the substrate; forming a nanodot array overlying the buffer layer; depositing an array of nanorods nucleated on the nanodot array; and depositing a high-temperature superconducting (HTS) layer around the array of nanorods and overlying the buffer layer.

A superconducting article includes a substrate having a biaxially textured surface, and an epitaxial biaxially textured superconducting film supported by the substrate. The epitaxial superconducting film includes particles of Ba₂RENbO₆ and is characterized by a critical current density higher than 1 MA/cm² at 77K, self-field. In one embodiment the particles are assembled into columns. The particles and nanocolumns of Ba₂RENbO₆ defects enhance flux pinning which results in improved critical current densities of the superconducting films. Methods of making superconducting films with Ba₂RENbO₆ defects are also disclosed.

The present invention provides a method of making a high temperature superconductor having a doped, nanoparticulate pinning structure. The method includes providing a nanoparticulate pinning material, providing a cuprate material, doping the nanoparticulate pinning material with a dopant to form a doped nanoparticulate material, depositing a layer of the cuprate material on a substrate, and depositing a layer of the doped nanoparticulate material on the layer of cuprate material. The invention also provides a high temperature superconductor (HTS) having a doped, nanoparticulate pinning structure including a plurality of layers of a cuprate material and a plurality of layers of a doped nanoparticulate pinning material. At least one layer of the doped nanoparticulate pinning material is stacked between two layers of the cuprate material.

The invention discloses a low-temperature fast powder sintering method for a superconduct nano-particle MgB2, which comprises the steps: magnesium powder and amorphous boron are mixed according to atomic ratio: Mg:B is equal to 1-1.5:2, then the compound is grinded for 0.3 to 2 hours and is pressed into block under the pressure of 2-7MPa; the block is added into a heating device and is added with argon, and the temperature raises to 980K - 1010K at the speed of 20 - 40K/min, then the temperature lowers to room temperature at the speed of 40 - 50K/min, and the superconduct nano-particle MgB2 is made. The diameter of MgB2 of the invention is about 10 to 20nm; Tc value is up to 38.5K, when the MgB2 nano particles are used for measuring superconducting transition temperature, which can not only maintain superconducting transition temperature close to theoretical value, but also be taken as the center of flux pinning, thereby enhancing critical current density.

The present invention relates to a method for producing a defect-containing superconducting film, the method comprising (a) depositing a phase-separable layer epitaxially onto a biaxially-textured substrate, wherein the phase-separable layer includes at least two phase-separable components; (b) achieving nanoscale phase separation of the phase-separable layer such that a phase-separated layer including at least two phase-separated components is produced; and (c) depositing a superconducting film epitaxially onto said phase-separated components of the phase-separated layer such that nanoscale features of the phase-separated layer are propagated into the superconducting film.

This invention relaters to a high critical current density superconductor of MgB2 base and its manufacturing method characterizing that C, Zr and other compounds are dispersed in said superconductor with MgB2 as the base, during the preparation, first of all, dried Mg, B, Zr and carbon powder in proportion are mixed fully for 1-2 hours to be formed then to be put in a vacuum annealing furnace to keep the temperature for 1-10 hours to be protected by Ar or mixed gas of Ar and H under 740-760deg.C to be cooled to room temperature to get a superconductor with MgB2 base of high critical current density.

A RE-type oxide superconducting wire having excellent angular dependence for magnetic field of Jc is obtained by finely dispersing magnetic flux pinning centers into a superconductor. A mixed solution which comprises a metal-organic complex solution including a metal element which composes a RE-type oxide superconductor whose Ba content is reduced and a metal-organic complex solution including at least one or more kinds of metals which are selected from Zr, Ce, Sn, or Ti which has a larger affinity for Ba is coated onto an intermediate layer of a composite substrate, and the assembly is then calcined to disperse artificially and finely oxide particles (magnetic flux pinning centers) including Zr. Thus, the angular dependence for magnetic field (Jc_,min/Jc_,max) of Jc can be remarkably improved.

The invention relates to a modularization reconfigurable method based on superconductive magnetic flux pinning connection and a simulation device applying the method. Particularly, interaction of an II-type high-temperature superconductor with a magnet and the characteristic of controllable magnetic field direction and size are utilized to establish reconfiguration of the modularization structure in a manner of establishing a superconductive magnetic flux pinning connecting interface. The magnetic flux pinning characteristic of the high-temperature superconductor in a superconducting state is fully utilized, the superconductive magnetic flux pinning connecting interface configured under the characteristic has certain rigidity and dampness and can be compared as connection by a spring having certain rigidity, and the superconductor can naturally enter the superconductive state in a space environment so that the reconfigurable method provides brand new developing idea for in-orbit assembly of a modularized spacecraft and has broad application prospect in the field of novel spacecraft development.

A superconducting article includes a substrate having a biaxially textured surface, and an epitaxial biaxially textured superconducting film supported by the substrate. The epitaxial superconducting film includes particles of Ba₂RETaO₆ and is characterized by a critical current density higher than 1 MA/cm² at 77K, self-field. In one embodiment the particles are assembled into columns. The particles and nanocolumns of Ba₂RETaO₆ defects enhance flux pinning which results in improved critical current densities of the superconducting films. Methods of making superconducting films with Ba₂RETaO₆ defects are also disclosed.

The invention discloses a method for increasing the superconducting critical current density of an ex-situ magnesium diboride block through a self reaction. The method for increasing the superconducting critical current density of the ex-situ magnesium diboride block through the self reaction includes the steps that according to an ex-situ method and a two-step sintering method, in the high temperature sintering stage, the self reaction inside the superconducting block is intensified, a new crystal boundary is formed and added, and meanwhile a small quantity of MgB4 impurities are generated; in the low temperature stage, MgB2 is mainly formed through the reaction, the content of the MgB4 impurities is decreased, and the small quantity of left MgB4 impurities serve as efficient magnetic flux pinning to increase the critical current density in the high magnetic field. According to the method, technical operation is easy, other substances do not need to be added, the preparing technology is simplified, and sources of raw materials are also convenient. The problem that pinning is difficult to lead with the ex-situ method is solved, and the content and the size of particles of pinning impurities can be controlled by controlling the sintering procedure. As the reaction is used by controlling temperature, the aim that the intercrystalline connectivity is improved through short-time sintering can be effectively achieved.

The invention discloses a magnetic suspension display platform, and belongs to the technical field of the magnetic suspension. The magnetic suspension display platform comprises a first platform and a second platform. The first platform comprises a high temperature superconductor array and a matched low temperature device thereof, such as a Dewar. The second platform comprises multiple sub-platforms. Each sub-platform has a magnet array formed by multiple magnets. The first platform and the second platform can form the horizontal suspension coordination of the vertical corresponding through the flux pinning force between the magnetic array and the high temperature superconductor array, and the magnetic force balance coordination is formed between the neighboring sub-platforms. The first platform and the second platform of the magnetic suspension display platform are made of a high temperature superconductivity material and a permanent magnet material (or a superconducting coil), the magnetic suspension coordination between two platforms can be realized by using the flux pinning force, and the magnetic force balance between multiple sub-platforms of the second platform formed by multiple magnets can be realized, so the whole suspension stability of the magnetic suspension display platform is guaranteed.

The invention discloses an in-situ preparation method of a magnesium borate-magnesium oxide multiphase superconducting material with different superconducting phase contents. According to the method, an MgB2-MgO multiphase superconductor adjustable and controllable in the superconducting phase content in situ is prepared in vacuum through taking boron (B), magnesium (Mg) and diboron trioxide (B2O3) as raw materials. The invention relates to a method for preparing a magnesium diboride (MgB2) multiphase superconducting material adjustable and controllable in the superconducting phase content in situ. The preparation method disclosed by the invention is simple and has the advantages that the wide-range in-situ adjustment and control of the superconducting phase content of an MgB2 multiphase superconductor can be realized and key techniques and base materials are provided for studying the magnesium borate superconducting weak connection property, the flux pinning behavior, the resistor type magnesium borate superconducting fault current limiter (SCFCL) and the like.