30results about How to "Good superconducting properties" patented technology

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 process for preparing MgB2 superconducting material which comprises the steps of, grinding B2O3 and Mg powder under the protection of oinert gas, loading the grinded raw material into ceramic crucible, sintering the crucible in vacuum pit furnace, naturally cooling down to room temperature in vacuum or under the inert gas protection status.

The invention relates to a metal Sn doped MgB2 superconductor and a high-temperature rapid preparation method thereof. A structural formula of the superconductor is (Mg1.02B2)1-xSnx, wherein x=0.01-0.05. The method comprises the following steps: fully mixing Mg powder, B powder and Sn powder according to atomic ratio, pressing and preparing the mixture into a cylindrical flake under the pressure of 2 to 10 MPa, and then putting the cylindrical flake into a high temperature differential scanning calorimeter or a tubular sintering furnace for sintering; and continuously heating the cylindrical flake to 850 to 900 DEG C at heating rate of 5 to 20 DEG C per minute for sintering treatment, and cooling the cylindrical flake to room temperature at cooling rate of 30 to 40 DEG C per minute. The practical application field of MgB2 is in an around 3T magnetic field, so the method improves the superconductivity of the MgB2 superconductor in a short time by doping metal Sn and using a high-temperature sintering method. The preparation method is simple, has low cost of the raw materials and short preparation time, and is a quite potential research method; and simultaneously, the obtained superconductor has obvious superconductivity.

The present invention provides a process for producing a superconducting material which can produce a large-area superconducting material having improved properties with high efficiency without ablation in the thermal decomposition of an organometal compound and the heat treatment of a superconducting substance. A process for producing a superconducting coating material, comprising conducting epitaxial growth through a step (1) of coating a solution of an organic compound of a metal, of which the oxide forms a superconducting substance, onto a support and drying the coating, a prebaking step (2) of thermally decomposingan organic component in the organometal compound, and a main baking step (3) of converting the thermal decomposition product to a superconducting substance. A laser beam isapplied in a period between step (1) and step (2) under such conditions that the intensity of the laser beam, the number of pulses, and the total energy amount of the laser beam satisfy a specific mathematical formula.

Disclosed is a long RE123 oxide superconductor stably having excellent superconducting characteristics at liquid nitrogen temperature, which can be used as a strand for a single-core or multicore wire material. Also disclosed is a method for mass-producing such a superconductor. Specifically disclosed is an RE123 oxide superconductor characterized by being composed of a conductive layer containing an REBa2Cu3O7-d oxide superconductor, which is made by using a mixed raw material including at least RE2BaO4 and a Bax-Cuy-Oz raw material, and a holding member for holding the conductive layer. In this connection, RE represents one or more elements selected from La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu and Y.

An elongated superconducting body has a core of superconducting oxide grains, and a constraining nonsuperconducting boundary substantially superscribing the superconducting core. The core has thin dimension that is less than or equal to ten times the average length of the grains and the grains are oriented with their a-b crystallographic planes coplanar with a line extending in the longitudinally-extending direction of the core.

The present invention relates to a process for applying a polymer to at least one individual conductor (10) of a high-temperature superconductor (HTS) composite in the manner of a Roebel conductor. Furthermore, the invention specifies a high-temperature superconductor (HTS) composite produced using the process. The at least one individual conductor (10) comprises at least one substrate (11) and at least one superconducting layer. Particles (12) are applied to the individual conductor (2, 6). Then, a thermal treatment (3, 7, 8) is performed which results in partial or complete melting of the particles (12) and, after cooling, in a polymer layer (13) on the individual conductor (10).

The invention relates to a metal Sn doped MgB2 superconductor and a low-temperature rapid preparation method thereof. A structural formula of the superconductor is (Mg1.02B2)1-xSnx, wherein x=0.01-0.05. The method comprises the following steps: fully mixing Mg powder, B powder and Sn powder according to atomic ratio, pressing and preparing the mixture into a cylindrical flake under the pressure of 2 to 10 MPa, and then putting the cylindrical flake into a high temperature differential scanning calorimeter or a tubular sintering furnace for sintering; and continuously heating the cylindrical flake to 550 to 600 DEG C at heating rate of 5 to 20 DEG C per minute for sintering treatment, and cooling the cylindrical flake to room temperature at cooling rate of 30 to 40 DEG C per minute. Analysis results show that the critical current density of the MgB2 superconductor is greatly improved compared with the MgB2 superconductor obtained under the same sintering condition. The preparation method is simple, the raw materials have low cost, the preparation temperature is low, the preparation time is short, the obtained superconductor has obvious superconductivity, and the method is a quite potential research method.

The invention discloses a method for producing nanometer structure with nano-photocatalytic active water. Templates and nanometer materials to be processed are immerged in the nano-photocatalytic active water; under irradiation of ultraviolet, the nanometer materials are deposited on the templates to generate the nanometer structure. Nanometer atom in the active water can be deposited on the templates or a work piece to crank out a nanometer product, thus replacing methods of high temperature, microvacuum, electron beam, laser, and vapor phase, and the like, for producing the nanometer structure. The nanometer structure prepared by the method is compact, well distributed, and is provided with strong bonding force, and is characterized by distinct properties of mechanics, optics, heat exchange, electromagnetic, superconduct, electricity, physics, and chemistry, and the like, particularly, the nanometer structure can be applied to important fields of national defense, military affairs, medical treatment, epidemic situation, industry and agriculture, and has important significance, can be capable of being applied to key technology which can not be solved by current technology. The technical craft is simple and is suitable for industrialized production; the cost is low; the technique can become a technical revolution.