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Production of superconductive wires and belts based on compound MgB2

A compound, superconducting wire technology, used in the manufacture/processing of superconducting devices, superconducting devices, superconducting/high-conducting conductors, etc.

Inactive Publication Date: 2006-12-13
INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not suitable for the production of industrial technical wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] 98% pure MgB 2 The powder is cold homogeneously compressed into a round rod with a diameter of 8mm under a pressure of 240Mpa. The rod is placed in a tantalum tube with an inner diameter of 10 mm and a wall thickness of 1 mm, closed at one end. Then the MgB that is set together with the tantalum tube 2 The rods were inserted into copper tubes with an inner diameter of 11 mm and a wall thickness of 1 mm, closed at one end, and their open ends were likewise sealed under vacuum. The resulting object is then deformed into a 0.45 mm thick and 5.7 mm wide Cu / Ta / MgB with the aid of hammers, rolls and flat rolls 2 Strips were heat-treated at 900°C for one hour in an Ar atmosphere-ambient. A sample of the belt was measured to have a critical temperature of 33K and a critical current density of 5.1KA / cm when the external electric field was 1.5T and 4.2K 2 , when the critical current density is 20KA / cm in its own field and 4.2K 2 .

example 2

[0027] For the production of a mechanical alloy Mg-B-powder, a Mg-powder with a purity of 99.8% and an amorphous boron powder with a purity of 99.9% are prepared according to the compound MgB 2 The stoichiometric composition ratios were mixed and ground in a planetary ball mill for 20 hours in a tungsten carbon (WC) milling container under an extremely pure Ar gas-environment, using WC-balls as milling bodies. The resulting powder was prepared as described in Example 1-Cu / Ta / MgB 2 strip. The bar was heat-treated for 20 minutes at 700°C in an Ar atmosphere-ambient. A sample of the tape was measured to have a critical temperature of 34K and a critical current density of 25KA / cm when in its own field and 4.2K 2 .

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PUM

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Abstract

A method for creating a long superconducting wire and tape materials that can be loaded with high current densities using MgB2. The method is based on the powder-in-the-tube technology. In this process, there is a composite consisting of a cover tube made of material with normal conductivity, and a powder of a superconducting compound or a preliminary product. This powder compound contained in this cover tube, are processed by reshaping and thermal treatment steps to the superconducting wire or tape material. According to the invention, a composite is supplied to the processing process that contains a powdery superconducting MgB2 compound or a powdery preliminary product for a superconducting MgB2 compound. The powdery preliminary product, has been only partially reacted to an MgB compound, or is a powder mixture consisting of the individual components of the desired MgB2 compound. This product is filled into the cover tube. A high technology standard long superconducting wire and tape based on MgB2 compound can be produced by adopting the present method and can be used as superconductor in the energy technology fild.

Description

technical field [0001] The present invention relates to a kind of based on compound MgB 2 Methods of production of superconducting wires and tapes. The wires and ribbons are particularly suitable for use as superconductors in the field of energy technology. Background technique [0002] Recently in the binary alloy MgB 2 Superconductors with Tc=38K to 40K were demonstrated for the first time in (J. Nagamatsu, N. Nagakawa, T. Muranaka, Y. Zenitani and J. Akamitsu, Nature 410 (2001), 63). [0003] In an experiment, a MgB was also produced by means of the diffusion of Mg into the boron-wire produced by thermal treatment of the boron-wire in the presence of Mg-powder in a quartz ampule. 2 - line (Canfield et al., in dense MgB 2 Superconductivity in wires, Publ. Cond-mat Homepage vom 15.02.01: cond-mat / 0102289). This method is not suitable for the production of industrial technical wire rods. [0004] Additional MgB 2 - the production method of the wire, for example using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/02H01B13/00H01L39/24C04B35/00B22F1/00C04B35/645H01B12/04H10N60/01
CPCH01L39/2487C04B35/58057C04B35/6455C04B2235/40C04B2235/402C04B2235/404C04B2235/407C04B2235/408C04B2235/422C04B2235/428C04B2235/5436C04B2235/6582C04B2235/94H10N60/0856
Inventor 克劳斯·菲舍尔沃尔夫冈·哈斯勒玛吉塔·舒泊特汉斯-彼德·特林克斯安德列亚斯·吉姆贝尔
Owner INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV