JPH01708A - Method for manufacturing superconducting ceramic coils - 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 method for producing a coil made of superconducting ceramics for constructing, for example, a superconducting magnet.

(Prior art) In recent years, f! Research and development into various functional materials is underway.

As these superconducting materials, those made of lead (Pb), niobium (Nb), vanadium (V), or various other alloys are known.

Among these superconducting materials (hereinafter sometimes referred to as superconducting alloys), materials such as Nb3Sn, V3Ga, and Nb-Ti have already been put into practical use, and Nb3Sn, V3Ga, and Nb-Ti have already been put into practical use.
3Ge and Nb5 (AQ, Ge) are being put to practical use, for example in electric wires! Processing technology for making wire rods for various uses has also been established.

A superconducting alloy having such a linear shape can be used, for example, as a superconducting magnet, in which the material is processed into a coil shape and a current is trapped in the coil to create a persistent current, thereby generating a strong magnetic field. . By using this superconducting magnet, it is possible to eliminate energy loss due to Joule heat and generate a high magnetic field with extremely high efficiency.

However, all currently known superconducting alloys exhibit superconductivity only at extremely low temperatures, e.g., the highest superconducting transition temperature T. 23.2K even for Nb3Ge with
(absolute temperature). For this reason, when constructing a superelectric S magnet using the superconducting alloy mentioned above, it is necessary to use a cryostat to insulate and seal the cryogen such as liquid helium (4.2K) or liquid hydrogen (20.3K). There is.

In recent years, progress has been made in the development of materials that exhibit superconductivity in relatively high temperature environments without using such large-scale heat-insulating materials. Being watched.

These superconducting ceramics have a much higher T than the superconducting alloys mentioned above. For example, literature engineering: '2eitsc
hrift fiir Physik B-Co
ndense Matter] (Vol, 64.N
o, 2. 8a-La-Cu-0 ceramics (Tc = 30K) disclosed in 1986)
)%, La-Ca-Cu-0 ceramics (Tc-40~70K), Y-Ba-Cu-0 ceramics (Tc = 9O-230K), and other excellent superconducting ceramics have been announced. There is.

The above-mentioned superconducting ceramics can be used, for example, in liquid nitrogen (77
Like K), it is possible to exhibit superconductivity in a cryogen that is relatively easy to handle.

The realization of superconducting materials with

(Problems to be Solved by the Invention) However, ceramics for boat fishing have poor plasticity compared to alloys, and are difficult to process, for example, into wire rods. Furthermore, most conventional ceramics are insulating materials, so there is no need to process them into a coil shape. This is hard,
The problem was that the technology for processing and forming superconducting ceramics into coils for use in superconducting magnets had not yet been established.

In view of the above-mentioned conventional problems, an object of the present invention is to simply and easily process ceramics into a coil shape, thereby providing an excellent superconducting ceramic coil.

(Means for Solving the Problems) In order to achieve this object, a method for manufacturing a superconducting ceramic coil, which is the first invention of this application, is described. While moving intermittently or continuously, particles of the superconducting ceramic material are sprayed toward the above-mentioned core material and deposited on the core material, and the portion of the core material to which the above-mentioned particles are deposited is intermittently or continuously It is characterized by being rolled up into a coil shape.

Further, according to the method for manufacturing a superconducting ceramic coil, which is the second invention of this application, particles of the superconducting ceramic material are sprayed toward a core material formed into a coil shape in advance and are deposited on the core material of the coil shape. It is characterized by

The superconducting ceramic material mentioned here comprehensively refers to ceramic materials that exhibit superconductivity after sintering, and does not indicate whether or not the material is already sintered at the time of the above-mentioned deposition.

(Function) In the method for manufacturing a superconducting ceramic coil of the present invention, the core material is made of, for example, metal or other suitable material having plasticity.

In the manufacturing method, which is the first invention of this application, a superconducting ceramic material after or before sintering is applied to the above-mentioned core material, and then the adhered core material is formed into a coil shape. The structure is such that a superconducting ceramic coil is obtained.

Further, in the manufacturing method which is the second invention of this application, the above-mentioned superconducting ceramic material is adhered to a core material formed into a coil shape in advance to obtain a superconducting ceramic coil.

Therefore, by the above-mentioned manufacturing method of the present invention,
Ceramics with brittle properties can be simply and easily processed into substantially helical coils.

(Example) Hereinafter, examples of the method for manufacturing a superconducting ceramic coil of the present invention will be described with reference to the drawings. In addition, the drawing is
The present invention is only schematically illustrated to facilitate understanding of the present invention, and the present invention is not limited to the illustrated example.

Furthermore, in the following description, the method for manufacturing a superconducting ceramic coil, which is the first invention of this application, will be described as a first embodiment, and the manufacturing method, which is the second invention, will be described as a second embodiment.

Firstly, a method for manufacturing a superconducting ceramic coil, which is the first invention of this application, will be explained with reference to the drawings.

In order to explain this manufacturing method, FIGS. 1A and 18 are schematic explanatory diagrams showing an example of an apparatus configuration for carrying out the method.

Among these figures, FIG. 1(A) is a front view of the device;
FIG. 1 CB) is a schematic plan view seen from the direction indicated by arrow p in FIG. 1(A).

In the figure, 11 is a string-like core material made of copper (Cu), platinum (Pt), carbon fiber, or any other suitable material, 13 is a superconducting ceramic material, and 15 is a core material 11 made of superconducting ceramic material 13. A superconducting ceramic coil formed into a small coil shape, 17 is a core material 11
19 is a take-up roller for winding up the core material 11 on which the superconducting ceramic material is adhered; 2I is a winding roller for blowing off the superconducting ceramic material as particles and adhering it to the core material 11; The deposition device 23 is a deposition tank adapted to the specifications of the deposition device 21.

The deposition process of this embodiment will now be explained with reference to FIG. 1(A)t-. As can be understood from this figure, the core material 11 made of, for example, copper is wound around the supply roller 17, and one end of the core material 11 is fixed to the take-up roller 19 by any suitable method. . After that, as mentioned above,
Supply roller 17 and take-up roller 19 wrapped around core material 11
The adhesion tank 23 is isolated from the outside air while the adhesion tank 23 is placed in the adhesion tank 23.

Next, depending on the operating conditions (described later) of the adherend M21 provided in the adherend tank 23, a vacuum is drawn into the adherend tank 23,
Alternatively, any suitable gas may be introduced after evacuation.

Next, in the adhesion tank 23, the supply roller 17 and the take-up roller 1
9 and the core material 11, the rollers 17 and 19 are rotated continuously or intermittently in the direction indicated by arrow a in FIG. 1(A).

Simultaneously with the continuous or intermittent movement of the core material 11 as the rollers 17 and 19 rotate, particles of the superconducting ceramic material are blown away from the deposition device 21 as indicated by arrows in the figure, and the supply roller The surface of the core material 11 between the winding roller 17 and the take-up roller 19 is coated with a desired film thickness according to the design. However, the structure of the coating device 21 is omitted in the figure. show.

Hereinafter, the molding process of the embodiment of this invention will be explained as shown in Fig. 1 (8).
Explain with reference to.

When moving to adhere the core material 11 described above, the superconducting ceramic material 13 wound up by the take-up roller 19 or the adhered core material 11 is removed from the core material 11 sent out from the supply roller 17. Figure 1 (B)
It is wound up relatively and continuously or intermittently with a shift as shown by arrow C in the middle. By winding the rollers in a staggered manner as shown by arrow C, the superconducting ceramic material 13 is coated on the core material 11 formed into a coiled (helical) shape, and then the superconducting ceramic material 13 is applied to the winding roller 19. A coil 15 is obtained.

In addition, the deposition material M21 used in carrying out the above-described manufacturing method can be, for example, various sputtering apparatuses including a conventionally well-known opposed target sputtering apparatus, a high-frequency magnetron sputtering apparatus, a vacuum evaporation apparatus, and an electron beam evaporation apparatus. It is preferable to carry out the process using various vapor deposition apparatuses or other deposition apparatuses. Along with this, when the deposition device 21 is a deposition device using a vacuum system, as described above,
After evacuation, for example, argon-oxygen (Ar-
The deposition is carried out in an atmosphere suitable for Subaru Ntagas or other deposition equipment such as 02).

However, the manufacturing method of the present invention is not carried out only by the above-mentioned adherend; for example, Document I11: r Nikkei New Materials J (No.
It is also possible to use a thermal spraying device 7 that utilizes a plasma process and is disclosed in the Japanese Patent Application Publication No. 2003-200103 (published on March 9, 1987).

The superconducting ceramic material used as the deposition source in this example will be explained below.

In the above-described embodiment, an example of a superconducting ceramic material is described, for example, in Document 11: '''Japanese Jou
rnalOf Applied Physics (Japanese Journal of Applied Physics) J (VOl, 26. No.

5, pL754-756 (May 1987)), a Y-Ba-Cu-0 based excitation conductive ceramic material was used.

First of all, the composition of the raw material is Y Ba2Cu306.5
Yttrium oxide ('/203), barium carbonate (BaC03), and copper oxide (Cub) are weighed out so that these materials are uniformly mixed in a conventional manner.

Next, these weighed and mixed materials were placed in an air atmosphere for 90 minutes.
Calcinate at a temperature of 00°C for 5 hours.

The calcined product is crushed to a certain extent, and an arbitrary suitable binder such as polyvinyl alcohol or the like is added thereto, and a target for use in a sputtering device or a vapor deposition device for use in a vapor deposition device is prepared according to the specifications of the above-mentioned deposition material M21. The material is then pressure molded into the desired shape according to the design. After this pressure molding, the calcined product was heated at a temperature of 950°C in an air atmosphere for 1 time.
By sintering for 0 hours, a deposition source made of the sintered superconducting ceramic material was obtained.

Furthermore, if the above-mentioned thermal spray equipment, evaporation equipment, or other equipment that exposes the deposition source to high heat and melts the deposition source during deposition, the deposition source is not necessarily coated. The deposition source does not need to be sintered, and the superconducting ceramic material constituting the deposition source may be calcined before sintering. In this case, the core material 11 may be heated at any suitable temperature and atmosphere depending on the characteristics of the superconducting ceramic material.
The superconducting ceramic material 13 (superconducting ceramic coil 15) that is adhered to the coil may be annealed.

Example 11 Next, a second embodiment of the second invention of this application will be described with reference to the drawings.

Similar to FIGS. 1A and 1B, FIGS. 2A and 2B show an example of the apparatus configuration for carrying out the method in order to explain this manufacturing method. It is an explanatory diagram. Among these figures, FIG. 2(A) is a front view of the device, and FIG. 2(B) is a part of the device configuration when viewed from the direction indicated by arrow q in FIG. 2(A). FIG. 2 is a schematic side view. In the figure, components having the same functions as those already explained in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this second embodiment, as shown in FIG. 2(A), a core material made of the above-mentioned material is previously formed into a coil shape (hereinafter, this core material formed into a coil shape will be referred to as a core material 25). )death,
Both ends of the core material 25 are fixed in the deposition tank 23 using a jig 27.

The core material 25 fixed in this manner is rotated relative to the deposition device 21 by rotating the jig 27 described above, for example in the direction indicated by arrow d in FIG. 2(8).

At the same time as the above-mentioned rotation is carried out, as already explained in the first embodiment, particles of the superconducting ceramic material shown by the arrows are ejected from the deposition device 21, and a desired film according to the design is formed on the surface of the core material 25. By thickly depositing, a superconducting ceramic coil 29 is obtained.

Further, the above-mentioned deposition device 21 is similar to the second embodiment,
It may be any of a sputtering device, a vapor deposition device, or a thermal spraying device, and the superconducting ceramic material serving as the deposition source is roughly the same as described above (before and after sintering, The superconducting ceramic material may be in any state.

In general, the rotation direction of the core material 25 is not limited to the illustrated example, and may be a rotation direction opposite to the illustrated direction, or may be changed without changing the rotation direction.

Although the first and second embodiments of the method for manufacturing a superconducting ceramic coil of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, as the superconducting ceramic material constituting the coil, Y-Ba-Cu-0 based ceramics have been described as an example, or the above-mentioned La-Ca-Cu-0 based ceramics or any other suitable ceramic material may be used. , it is clear that the fabrication method of this invention can be implemented.

Also, it is preferable that the superconducting ceramic coil described above be manufactured in such a manner that the periphery of the core material is uniformly covered with the superconducting ceramic material, for example, by rotation as shown by the arrow d described in the second embodiment. . However, the invention is not limited to this, and at least the superconducting ceramic material constituting the superconducting ceramic coil can be continuously deposited from one end of the coil to the other end. For example, a portion of the core material may be exposed on the surface of the coil.

It is clear that these material conditions, coil shape, adhesion conditions, and other conditions may be modified and modified as desired within the scope of the present invention and in accordance with the design.

(Effect of the invention) As is clear from the above explanation, this
According to the method for producing a superconducting ceramic coil according to the invention, a superconducting ceramic material after or before sintering is applied to the core material by binding particles of the material, and then,
After deposition, the core material is formed into a coil shape to obtain a conductive ceramic coil.

Further, in the manufacturing method which is the second invention of this application, a superconducting ceramic coil is obtained by depositing the above-mentioned superconducting ceramic material in the form of particles onto a core material that has been previously formed into a coil shape.

Therefore, a superconducting ceramic coil can be easily and easily obtained even from ceramics having brittle FF quality.

Therefore, by using a superconducting ceramic material having a high superconducting transition temperature, it is possible to provide an excellent superconducting ceramic coil that can generate a strong magnetic field.

[Brief explanation of drawings]

Figures 1 (A) and (B) are explanatory diagrams of the first embodiment according to the first invention of this application, and Figures 2 (A) and (8) are explanatory diagrams of the second embodiment according to the second invention of this application. It is an explanatory diagram of an example. 11... Core material, 13... Superconducting ceramic material 15, 29... Superconducting ceramic coil 17...
... Supply roller, 19 ... Take-up roller 21 ...
Adhering device, 23...Adhering tank 25...Core material (coiled), 27...Jig a...Rotation direction of roller b...Particles of superconducting ceramic material C...Movement direction of the roller d...Rotation direction of the core material 25. /% Loco

Claims (2)

[Claims] (1) Without moving the string-shaped core material intermittently or continuously, particles of the superconducting ceramic material are blown toward the core material and deposited on the core material, and the core material with the particles deposited is A method for producing a superconducting ceramic coil, which comprises winding a portion of the coil intermittently or continuously to form a coil. (2) A method for producing a superconducting ceramic coil, which comprises blowing particles of a superconducting ceramic material toward a coiled core material and depositing them on the core material.