JPH01674A - How to connect oxide superconducting wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Applications] [The present invention relates to a method for connecting oxide superconducting wires used, for example, in superconducting magnets.

1 is a cross-sectional view of an i-oxide superconducting wire connected by a conventional connection method, in which (1) and (2) are, for example, i) an acid or compound superconducting wire made of a 9ium-based oxide;
is an oxide superconducting film formed by plasma spray to connect the oxide superconducting wires (1) and (2).

The oxide superconducting wire constructed in this way is connected by overlapping the ends of the oxide superconducting wires (1) and (2), and coating the parts with the same type of oxide by plasma spraying.

[Problem that the invention seeks to solve]

Conventional methods for connecting oxide superconducting wires require plasma connections to be made in a vacuum, which poses problems such as the use of plasma spray to connect large coils to be inappropriate in terms of precision, degree of vacuum, etc. There was a point.

This invention was made to solve the above-mentioned problems, and since oxide superconducting wires can be firmly connected to each other and can be connected in the atmosphere, the oxide superconducting wire can be applied to the connection of large coils, etc. The purpose is to obtain a method for connecting physical superconducting wires.

[Means for solving problems]

The method for connecting oxide superconducting wires of the present invention includes heating a first oxide superconducting wire and a second oxide superconducting wire in close contact with each other in a high-temperature furnace, and The first oxide superconducting wire and the second oxide superconducting wire are connected by passing a current between the two oxide superconducting wires.

[For production]

In this invention, the connection between the first oxide superconducting wire and the second oxide superconducting wire is heated by Joule heat generated by heat and electric current from a high-temperature furnace, so that oxide molecules interdiffuse. The oxide superconducting wire with a result rate of 1 and the second oxide superconducting wire are firmly connected.

〔Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention, in which (10) and (11) are first and second oxide superconducting wires made of, for example, yttrium-based oxide;
(12) are first and second oxide superconducting wires (1o),
(11) Superconducting powder interposed between the first and second oxide superconducting wires (1aj, '(t 1 ) and made of the same kind of oxide; (15) superconducting powder interposed between the first and second oxide superconducting wires (1aj, A high-temperature furnace for heating and sintering wires (1o) and (It), (14
) is the first oxide superconductor at both ends! (10) and the second oxide superconducting wire (11) (: are power supplies connected to each other.

The oxide superconducting wires configured as described above are interposed and brought into close contact with each other. Next, the first and second oxide superconducting wires (to) and (tB) are placed in a high-temperature furnace (13) and heated to a temperature close to the sintering temperature or phase transition temperature of the oxide superconductor. Then, a constant current is applied to gI&1 and the second oxide superconducting wire (to)*(11) from the room temperature section.The first and second oxide superconducting wire (to)
, (11) has a high resistance in the initial stage, and only this connection part self-heats due to Joule heat. This heat generation causes the first and second oxide superconducting wires (10J, (1[
The ends of the powder (12J) begin to sinter. As the sintering progresses, the resistance of the connection decreases and the temperature of the connection decreases. Therefore, the connection becomes very homogeneous sintered and has no ridges. 1
oxide superconducting wire (10) and second oxide superconducting wire (1
1) is strongly connected.

In addition, in the above embodiment, the case where the powder (12) was interposed between the first oxide superconducting wire (10) and the second oxide superconducting wire (11) was explained. The wire (10) and the second oxide superconducting wire (11) may be directly connected. In addition, the first oxide superconducting wire (1
0) and the second oxide superconducting wire (11) in order to improve the connection strength between both (10) and (11).
The area of the connection surface may be increased by making it sloped as shown in the figure or uneven as shown in the wIs figure.

〔Effect of the invention〕

As explained above, according to the present invention, the first oxide superconducting wire and the second oxide superconducting wire can be connected even in the atmosphere, so that the present invention can be applied even to the connection of large coils.

In addition, homogeneous sintering is obtained at the connection between the first oxide superconducting wire and the second oxide superconducting wire, and the first oxide superconducting wire and the second oxide superconducting wire are firmly connected. be done. Furthermore, since the temperature of the connecting portion increases due to self-heating, the capacity of the high-temperature furnace can be kept small.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an oxide superconducting wire connected by a method for connecting oxide superconducting wires according to an embodiment of the present invention, and FIG.
The cause is a cross-sectional view of an oxide superconducting wire according to another embodiment of the present invention, FIG. 3 is a cross-sectional view of an oxide superconducting wire according to still another embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view of oxide superconducting wires connected by a connecting method. In the figure, (10) is the first oxide superconducting wire, (11
) is the second oxide superconducting wire, (12) is the powder, (13)
is a high temperature furnace 1. (14) is a power source. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1 12, Powder 73' M: 5.7 houses Figure 2 14 Electricity: Original f$ 3 Flash

Claims (3)

[Claims] (1) The first oxide superconducting wire and the second oxide superconducting wire are brought into close contact with each other and heated in a high-temperature furnace, and the distance between the first oxide superconducting wire and the second oxide superconducting wire is The first
A method for connecting an oxide superconducting wire, comprising connecting an oxide superconducting wire and a second oxide superconducting wire. (2) The method for connecting oxide superconducting wires according to claim 1, wherein oxide superconducting powder is interposed between the first oxide superconducting wire and the second oxide superconducting wire. (3) The oxide superconducting wire according to claim 1 or 2, wherein the connecting surface of the oxide superconducting wire where the first and second oxide superconducting wires are in close contact with each other is inclined or uneven. Connection method.