JPS63310510A - Superconductive wire - Google Patents

Abstract

PURPOSE:To prevent a damage from the external force owing to the contact with other substances by covering the outer periphery of a superconductive linear body in which a superconductive material is filled or which has plural grooves or recesses, with a conductive pipe. CONSTITUTION:A superconductive wire has a superconductive linear body in which a superconductive material 2 is attached to grooves of a linear body 1 with grooves, which consists of a metallic material, a ceramics, or the like, as a basic structure, and moreover, the outer periphery of the superconductive linear body is covered with a conductor pipe 3 to form the superconductive wire. Since the stress generated between layers is sustained by the projections forming the grooves, even though the superconductive wires made in such a way are superposed and wound plurally on a bobbin, the damage of the superconductive material can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a superconducting wire with stable characteristics.

[Conventional technology and its problems]

In the past, superconductors were made using metallic materials such as Nb, which had good processing characteristics and the processing techniques used in the past could be applied as they are, but these processing techniques cannot be applied to recent oxide superconducting materials. Since oxide materials grow crystals by heating and sintering from a powder or gel state, they are difficult to handle as linear bodies. For example, even if a superconductor is coated on a copper wire as in a conventional light bulb, If this long wire is stacked and wound on a drum or the like, the superconducting coating material will be damaged by the pressure of the stacked portion, making it impossible to produce a satisfactory superconducting wire.

The purpose of the present invention is to create a superconducting wire that can withstand practical use even when subjected to external forces by contacting other objects, in order to compensate for the drawbacks of superconducting wires that are easily damaged when coming into contact with other objects. It is about providing.

[Means for solving problems]

The present invention provides a superconducting wire characterized by having a structure in which a groove or a recess is filled with a superconducting material that is easily damaged, and is manufactured so as to exhibit superconducting properties in this state, and a conductor pipe is provided on top of the superconducting material. However, it differs from conventional technology in its stability of properties and ease of manufacture.

〔Example〕

FIG. 1 is a sectional view illustrating a first embodiment of the superconducting wire of the present invention, in which 1 is a grooved wire body made of a metal material or ceramic, 2 is a superconducting material, and 3 is a conductive wire. It is a body pipe. Since the basic structure of this superconducting wire is a superconducting wire body in which superconducting material 2 is attached to the grooves of a grooved wire body 1, even if it is wound in multiple layers and removed from a bobbin, there will be no gaps between each layer. Since the stress generated in the grooved linear body is supported by the protrusions forming the grooves, the superconducting material 2 is not damaged.

In the present invention, no damage was observed in the superconducting material even when a linear body of about 500 m was heat-treated and the conductive pipe 3 was further formed.

On the other hand, a 1φ copper wire is coated with a 0.1■ thick superconducting material,
When I bobbined about 500m, 90% of it
The superconducting material developed cracks and could not be put to practical use.

2 and 3 are cross-sectional views showing a second embodiment of the superconducting wire of the present invention, in which 4 is a wire with a recess made by bending a material having plasticity into a concave shape, and the recess has a superconducting wire. It is filled with material 2. The basic structure of FIG. 3 is a superconducting wire-like body assembled by mutually twisting a plurality of recessed wires 4 shown in FIG. Furthermore, a conductor pipe 3 is coated around the outer periphery of the superconducting wire body. The ease of handling and the like were the same as in Example 1. Note that in both the first and second embodiments, the grooves or recesses may be formed in a spiral shape at an arbitrary pitch in the longitudinal direction of the linear body.

FIG. 4 is a diagram illustrating the manufacturing method according to the present invention.

6 is a bobbin that sends out the grooved linear body 1 or the recessed wire 4; 7 is a hopper that stores the superconducting material 2; 8 is a pre-sintering furnace that slightly sinters the superconducting material 2 that has entered the groove or the recess; 9 is a winding bobbin for the finished linear body. Because of this configuration, when a linear body having grooves or recesses is passed through the hopper 7, the grooves and recesses are filled with the superconducting material 2, and sintered in the pre-sintering furnace 8. A superconducting linear body is formed by this. Next, a superconducting wire is obtained by covering this superconducting wire with a conductor pipe 3.

〔Effect of the invention〕

As explained above, in the superconducting wire of the present invention, the grooves and recesses are filled with a superconducting material that is inherently susceptible to damage by external forces, so even if it is subjected to external forces or comes into contact with other objects, It has the advantage of being unbreakable and easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a first embodiment of the invention, and FIGS. 2 and 3 are sectional views of a second embodiment of the invention. FIG. 4 is a diagram showing some steps of the method for manufacturing a superconducting wire of the present invention. DESCRIPTION OF SYMBOLS 1... Grooved linear body, 2... Superconducting material, 3... Conductor pipe, 4... Wire with recess, 6... Delivery bobbin, 7... Hopper, 8... - Temporary sintering furnace, 9... Winding bobbin. '#3 Field 4 (2)

Claims (2)

[Claims] (1) A superconducting wire characterized by comprising a superconducting linear body having one or more grooves or recesses filled with a superconducting material, and a conductor pipe coated around the outer periphery of the superconducting linear body. . (2) The superconducting wire according to claim 1, wherein the groove or the recess is formed in a spiral shape.