JPH01239711A - Ceramic superconductive wire - Google Patents

Abstract

PURPOSE:To obtain a ceramic superconductive wire without generating crack even if bent in a coil-shape by making ceramic superconductive material into powder with very small grain size and charging the powder in a pipe to be a wire rod. CONSTITUTION:Ceramic superconductive material is made into powder with very small grain size such as 5mum. The powder 2 of the ceramic superconductive material is charged in a vinyl pipe 1 to be formed into a wire rod I. The powder 2 charged in the vinyl pipe 1 does not have contact resistance since it is a superconductor and the wire rod is wound around a core 3 to be a coil very easily. The powder 2 charged in the vinyl pipe 1 has very small bearing stress since the grain size thereof is very small. Thus, there is no generation of crack on the wire rod I even if bent in a coil-shape and the wire rod I can be easily bent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses ceramic superconducting materials in power transmission lines, generators,
This invention relates to ceramic superconducting wires made into wires for use in electromagnets and the like.

[Traditional Art] In order to put superconductors into practical use in power transmission lines, power generation, electromagnets, etc., attempts have been made to turn superconductors into wires.

In particular, in recent years, research has been underway both in Japan and abroad to commercialize superconductors made from materials that become superconducting at high temperatures (absolute temperature of around 90 degrees Celsius) into wire rods. In Japan, various proposals have been made to date regarding the production of wire from superconducting materials using ceramics with a critical temperature (the temperature above which superconductivity is lost) of 90 class. However, all of these proposals are characterized by sintering ceramic superconducting material into a wire shape.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional methods for making wire rods, ceramic powder that is not superconducting is sintered to make a superconducting material, and it cannot be made into a coil shape or the like. It has the disadvantage that it produces a crank when bending is applied, and when the current is increased to the critical current density, the current density (the current density just before the resistance reaches the critical current density) decreases, making it impractical for practical use. .

Therefore, the present invention aims to provide a ceramic superconducting wire that does not cause cracks even when bent into a coil shape.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a structure in which a pipe is filled with ceramic superconducting material powder having a particle size of 5 μm or less.

[Function] Since the pipe is filled with superconducting powder,
By adding flexibility to pipes, we can obtain superconducting wires that can be freely bent into coils, making it possible to create wires from superconducting materials.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an example of the ceramic superconducting wire of the present invention, in which the ceramic superconducting material used as a superconductor is made into a very small powder with a particle size of, for example, 5 μm or less, and the ceramic superconducting wire is The material powder 2 is packed inside a vinyl pipe 1 to form a wire rod (■).

Since the powder 2 filled in the vinyl pipe 1 is superconducting, there is no contact resistance, and the wire 2 can be easily wound around the winding core 3 to form a coil as shown in Fig. 2. At this time, the particle size of the ceramic superconducting material powder 2 filled in the pipe 1 is very small, so the surface pressure is small, and the wire ■ can be easily bent into a coil shape without causing any cracks. The bending can be changed. Incidentally, the particle size of the powder 2 is small, which is advantageous because the surface pressure is small.

Conventionally, it was considered difficult to turn hard ceramics into wire rods, and even if they could be turned into wire rods, it was difficult to bend them. However, as described above, in the present invention, superconducting ceramic powder 2 is filled into pipe 1 and wire rods are made. (2) Therefore, it becomes possible to easily produce a ceramic superconducting material into a wire and a ceramic superconducting wire that can be bent into a coil shape.

Although the pipe 1 is shown as a vinyl pipe, other materials such as synthetic resin, metal, fiber reinforced plastic (FRP), etc. other than vinyl may be used.

[Effects of the Invention] As described above, according to the ceramic superconducting wire of the present invention, the superconducting ceramic superconducting material is made into a powder with a very small particle size, and this powder is filled into a pipe. Since it has a wire structure, it can be easily bent when bent into a coil shape, and there is no risk of cracking at this time, and it can be put into practical use without lowering the critical current density. It can have excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the ceramic superconducting wire of the present invention, and FIG. 2 is a schematic diagram showing a state in which the wire is bent into a coil shape. Process: Wire rod, 1: Vinyl pipe, 2: Ceramic superconducting material powder.

Claims (1)

[Claims] 1) A ceramic superconducting wire characterized in that a ceramic superconducting material is made into powder with a very small particle size, and the inside of a pipe is filled with the powder of the ceramic superconducting material.