31results about How to "Good superconducting properties" patented technology

The invention discloses a method for preparing a high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing a chemical solution method. The method comprises the steps of firstly preparing low-fluorine-gadolinium-barium-copper-oxygen solution which adopts gadolinium oxide or gadolinium acetate tetrahydrate, barium acetate and copper acetate as initial raw materials and adopts a complexing agent, dissolving the initial raw materials in a solvent to form fluorine-contained gadolinium-barium-copper-oxygen solution, then preparing and drying a gel thin film, and finally conducting preprocessing and final processing on the thin film to obtain the high-temperature superconducting GBCO (gadolinium-barium-copper-oxygen) thin film. According to the thin film prepared by the method provided by the invention, the surface of the thin film is smooth, and the thin film has good superconductivity, and is low in preparation cost, simple in process and easy to control; the heat treatment cycle is shortened greatly, and compared with the low-fluorine-gadolinium-barium-copper-oxygen solution prepared by other methods, the method has the advantages that the fluorine content in the low--fluorine-gadolinium-barium-copper-oxygen solution is lower, the preprocessing of the thin film can be completed by the rapid heat processing within the time not more than 2h, and the performances of the obtained thin film can realize the characteristics of high-clinical conversion temperature Tc and high-clinical current density Jc.

The invention discloses a rapid sintering preparation method of Tl-2212 superconducting thin film. Silver foil or gold foil is used to seal and wrap the amorphous precursor film containing thallium and the burning target containing thallium, and the Sintering in the environment. The invention includes four processes including the preparation of a precursor film, the preparation of a thallium source accompanying firing target, the rapid temperature-raising sintering of the precursor film in an argon / oxygen environment, and the oxygen-supplementing heat treatment of a primary sample. Compared with the traditional sintering method, the sintering conditions for growing Tl‑2212 thin films using this technology are not affected by the deposition method of the precursor film, the powder particle size of the starting material of the thallium source accompanying firing target and its preparation method, avoiding the Due to the replacement of the manufacturer's raw materials and the pioneering film deposition method, it is necessary to re-explore the sintering process for a long time. At the same time, the method also greatly reduces the amount of the thallium source accompanying the burning target, shortens the heating and cooling time and constant temperature time, reduces the production cost, and improves the repeatability of the experiment.

Disclosed is a Nb-containing rod-shaped material which can be used in the manufacture of a Nb3Sn superconducting wire and can impart good processability to Nb or a Nb-based alloy. Also disclosed is a method for manufacture of a superconducting wire having good superconducting properties by using the Nb-containing rod-shaped material. The Nb-containing rod-shaped material can be produced by the steps of: casting a raw material for the rod-shaped material in a mold having a circular or approximately circular cross-section to produce a molded article; and performing a hot working processing or a cold working processing of the molded article into a cylindrical or approximately cylindrical shape using a processing device having a circular or approximately circular cross-section.

A precursor for manufacturing a Nb3Sn superconducting wire according to the present invention includes a mono-element wire including a Sn or Sn-based alloy core disposed at the, a Cu or Cu-based alloy matrix and a plurality of Nb or Nb-based alloy filaments surrounding the Sn or Sn-based alloy core, and a diffusion barrier layer and a stabilizing copper layer surrounding the Cu or Cu-based alloy matrix. In a final shape after a reduction process, the average diameter of the Nb or Nb-based alloy filaments is set to 5 μm to 30 μm, and the average distance between the Sn or Sn-based alloy core and the Nb or Nb-based alloy filaments nearest the Sn or Sn-based alloy core is set to 100 μm or less.

The film-forming substrates molded to a predetermined size are embedded side by side in the connection substrate, connected and integrated, and the intermediate layer, superconducting layer, and protective layer are laminated on the film-forming surface side of the film-forming substrate, and then the following steps are performed: method, etc. to manufacture superconducting conductors, that is: winding one or more integrated superconducting conductors on a prescribed core material; Winding one or more wires on the core material; and alternately winding integrated and non-integrated wires, etc., obtains a superconducting conductor having good superconducting properties without shape problems such as local protrusions.

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 invention relates to a method for applying plastic to at least one individual conductor (10) of a high-temperature superconductor (HTS) composite of the Lebel type. In addition, a high-temperature superconductor (HTS) composite manufactured by the method is also provided. Said at least one single conductor (10) comprises at least one carrier (11) and at least one superconducting layer. Particles (12) are deposited on individual conductors (2, 6). A heat treatment (3, 7, 8) is then carried out which leads to partial or complete melting of the particles (12) and, after cooling, to the formation of a plastic layer (13) on the individual conductors (10).

The invention discloses a method for preparing a gadolinium-barium-copper-oxygen (GdBCO) high-temperature superconducting thin film by using a chemical solution method. The method comprises the steps of: firstly, preparing a low-fluorine GdBCO solution, wherein the low-fluorine GdBCO solution is prepared by adopting gadolinium oxide or gadolinium acetate, barium acetate and copper acetate as initial raw materials, adopting a complexing agent and dissolving the initial raw materials in a solvent; then, preparing and drying a gel thin film; and finally carrying out preprocessing and final processing on the thin film to obtain the GdBCO high-temperature superconducting thin film. The thin film prepared by using the method provided by the invention is smooth in surface, favorable in supoerconducting property, low in preparation cost and simple in a process which is easy to control; and the period of a thermal treatment process is greatly shortened, compared with low-fluorine GdBCO solutions prepared with other methods, the GdBCO high-temperature superconducting thin film is lower in fluorine content and can be preprocessed through rapid thermal treatment being less than 2 hours, and the obtained thin film also has the characteristics of high critical transformation temperature Tc and high critical current density Jc.