JPS63225412A - Heat processing of multi-core superconductor - 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 Application Field> The present invention relates to a heat treatment method for multicore superconducting wires such as Lung-TL.

<Prior art and its problems> Conventionally, when heat-treating superconducting wires, if the superconducting wires are bundled and have a size and shape that cannot be heat-treated, heat treatment is performed in the drum state as it is after wire drawing. Ta.

Therefore, due to differences in the thermal WB expansion coefficients of the matrix material or reel, other auxiliary materials, and superconducting materials, close contact occurs between the superconducting wires, resulting in time-consuming post-heat treatment or damage to the wires. There was a problem with attaching the .

<Means for solving the problem island> This invention was obtained as a result of studies to solve the problems of the above-mentioned conventional methods.

That is, in this invention, after the wire drawing process is completed, the superconducting wire wound into a reel is given tension to an extent that does not cause winding disorder, and after being re-wound onto another reel, a buffer is inserted between the superconducting wires. It is characterized by heat treatment, and in short, (1) rewinding is performed after wire drawing.

(2) When rewinding, tension is applied to the superconducting wire to the extent that the winding state does not collapse.

(3) During rewinding, a lubricant such as rapeseed oil, which does not completely vaporize at the required heat treatment temperature, is applied as a buffer between the superconducting wires.

The configuration means is:

<Function> When drawing the wire, appropriate tension is required on the winding side, in addition to the tension necessary for drawing the wire, to prevent the wire from falling or collapsing at the collar of the reel. This tension becomes compressive stress between the superconducting wires.

In addition to this stress, compressive stress is generated between the superconducting wires due to differences in thermal expansion between the constituent materials of the composite superconducting wire and the material of the reel. These stresses cause the superconducting wires to stick together.

The present invention solves these problems by: (1) rewinding the wire to release excess tension from the wire wound on the reel during drawing;

(Z At that time, rewind with a small tension until the winding state collapses.

However, although the former compressive stress mentioned above can be minimized by this, the latter compressive stress cannot be fundamentally solved. Therefore, B! between the superconducting wires! A lubricant is applied as a lubricant, and a buffer section is inserted between the superconducting wires to absorb stress.

The lubricant used at this time is preferably one that does not completely vaporize at the required heat treatment temperature, and is preferably one that can be easily removed after the heat treatment.

Examples of such lubricants include BT, glass tape rapeseed oil, and the like.

<Example> Actually tI! 1. When carrying out heating wire treatment of conductive wires at around 250°C, we tested the effectiveness of adhesion prevention using the lubricants shown in Table 1, and found that better results were obtained with rapeseed oil than with the results shown in Table 1. Regarding the amount of application, the higher the humidity, the more
It was recognized that more is better, and when the coating amount was increased during heat treatment at a low temperature, too much oil remained on the surface of the H3 conductive wire, resulting in stains.

Table 1 <Effects of the Invention> As explained above, by the method of the present invention, by rewinding the wire onto a drum after drawing, weakening the tension, and using lubricating oil, it is possible to sufficiently prevent the Ia material from adhering after heat treatment. It can be done.

Applicant's agent Patent attorney Kazu 1) Showa procedure amendment damage (self-defense) February 20, 1986

Claims (2)

[Claims] (1) After completing the wire drawing process and winding the superconducting wire into a reel, apply tension to the extent that no winding disorder occurs and rewind it onto another reel, then insert a buffer between the superconducting wires and heat-treat. A method for heat treatment of multicore superconducting wire, characterized by: (2) The method for heat treatment of a multicore superconducting wire according to claim 1, characterized in that a lubricant that does not completely vaporize at the heat treatment temperature is used as a buffering agent.