JPS63259988A - How to connect superconductors - Google Patents

Abstract

PURPOSE:To enhance the reliability and also improve the workability of a superconductor by covering the outside of the connection of superconductor with a superconductive molding and heating and pressuring it to integrate the superconductor with the molding. CONSTITUTION:A molding 1 is formed by preliminarily molding the powder of a material to be formed in a superconductive object by being heated, pressurized and sintered, and when a superconductor 2 has a rod shape, its cross section is cylindrical and when it has a plate shape, its cross section is a one- side opened rectangle. Then, superconductors 2 are inserted from both ends of such a molding 1, respectively. In order to sinter the molding 1, a heat generator 4 on an outer shell 3 is electrified to press the outer shell 3 simultaneously with heating the molding 1 so as to compress the molding 1 so that it can be attached to the surface of superconductor 2 tightly enough to advance sintering. As the result of the above process, no foreign matter can be mixed in the connection between the superconductors and both of them can be connected to each other by means of a reliable circuit which passes through the molding, regardless of presence or absence of any abnormal state in the connection.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for connecting superconductors.

[Conventional technology]

Soldering, brazing, or jointing have been widely used as methods for connecting normal conductors.

However, it is impossible to employ such a method when connecting superconductors. This is because, as in the case of brazing, it is prohibited to allow foreign matter to get into the joint, even if it is just an extremely thin coating, and it is affected by local heating, and it is also caused by joints. The connection method tends to cause unstable distortion at the connection part (but in any case, it is almost impossible to make a reliable connection.

[Problem that the invention seeks to solve]

As described above, the conventional technology has a problem in that a method for connecting superconductors that is highly reliable and has good workability has not been developed.

[Means for solving problems]

In order to solve the above problems, this invention pre-sinters a granular material that will become a superconducting object by heating and pressurizing it and sintering it. A molded body into which the superconductor can be inserted is formed in advance, the superconductor is inserted into this molded body from both ends, and an outer shell that serves as a heat source is placed on the outside of this molded body and heated and pressurized, or molded. After the body is covered with an outer shell in advance, the superconductor is inserted and heated and pressurized to integrate the molded body and the superconductor to connect the superconductors.

[Effect]

In order to integrate the superconductor and molded body by covering the outside of the connecting part of the rod-shaped or plate-shaped superconductors with a superconducting molded body and applying heat and pressure, it is necessary to prevent foreign matter from entering the connecting part of the superconductor. There is no chance of any contamination, and regardless of the presence or absence of any abnormalities in the connecting parts of both superconductors, the two will be connected by a reliable circuit via the superconducting molded body, demonstrating a high degree of reliability. become.

〔Example〕

Specific examples for explaining the present invention in detail are shown in FIGS. 1 to 3, and the molded body 1 is formed by preforming a granular body of material that becomes a superconducting object by heating and pressurizing and sintering. When the superconductor 2 is rod-shaped, it has a cylindrical cross section as shown in Figure 2, and when it is plate-shaped, it has a U-shaped cross section as shown in Figure 3 (or the illustration is omitted). It is also preferable to use two plate shapes with both sides spaced apart from each other.

Next, the superconductor 2 is inserted from both ends of the molded body 1 as shown in FIG. At this time, there is no problem even if the tips of the superconductors 2 are in contact with each other, or even if they are not in contact as shown in FIG. 5.6.

Furthermore, a heating element 4 is built into the outer shell 3 that covers the outside of the molded body 1, and this heating element 4 generates heat when energized and serves as a heat source for sintering the molded body 1 inside. To sinter the molded body 1, electricity is applied to the heating element 4 of the outer shell 3 to heat the molded body 1 and at the same time pressurize the outer shell 3, compressing the molded body 1 and applying sufficient pressure to the surface of the superconductor 2 inside. Sintering progresses by bringing them into close contact. In addition, it is desirable to provide an allowance 5 in the outer shell 3 of the molded body 1 as an interference margin when pressurizing, as shown in FIG. 2, for example.

Further, the method of energizing the heating element 4 built into the outer shell 3 is not particularly limited, and even a method of providing an independent dedicated circuit as shown in FIG.
The superconductor 2 may be made part of a circuit and connected to it, for example, by a conductor 6 as shown in FIG. 5, or directly contacted by a terminal 7 as shown in FIG.

Note that after the molded body 1 and the superconductor 2 are integrated by sintering, the outer shell 3 may be left as is or removed; however, in order to maintain strength, the former is It can be said that it is preferable.

〔effect〕

In the superconductor connection method of this invention, the preform is used as the connection part, so it is very easy to work with, and the preform can be easily carried with the outer shell covered. Work can be done anywhere, and the finished product is small and in good condition. Moreover, since no foreign substances such as solder or wax are used, and there are no factors such as joints that promote instability in the connection parts, extremely reliable connections can be made, which is the significance of this invention. It can be said that it is very large.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view specifically illustrating the method of the present invention, FIGS. 2 and 3 are lateral sectional views illustrating the configuration of FIG. 1, and FIGS. 4 to 6 are sectional views of the present invention. FIG. 3 is a longitudinal cross-sectional view illustrating an electric circuit of a heat source necessary for sintering in the method of FIG. 1... Molded body, 2... Superconductor, 3.
... Outer shell, 4 ... Heating element, 5 ...
- Clearance area, 6... Conductor, 7... Terminal.

Claims (2)

[Claims] (1) Preliminary sintering of granular material that becomes a superconducting object by sintering with heating and pressure, and pre-forming into a compact into which rod-shaped or plate-shaped superconductors can be inserted from both ends. The superconductor is inserted into the molded body from both ends, and then an outer shell that serves as a heat source is placed on the outside of the molded body and heated and pressurized to integrate the molded body and the superconductor. A method for connecting superconductors. (2) Preliminary sintering of granular material that becomes a superconducting object by heating and sintering under pressure, and pre-forming a compact into which rod-shaped or plate-shaped superconductors can be inserted from both ends. Then, an outer shell that serves as a heat source is placed on the outside of this compact, and rod-shaped or plate-shaped superconductors are inserted into both ends of the compact, and then the outer shell is heated and pressurized to sinter the compact and the superconductor. A method for connecting superconductors, characterized by integrating the superconductors.