JPH09260132A - Release processing method and method of manufacturing superconducting magnet using the same - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve the thermal conductivity of a coil and maintain superconductivity. SOLUTION: When manufacturing a superconducting magnet 1 using a superconducting wire that needs to be fired by heat treatment, a coil 2 formed by winding the superconducting wire is coated with a low-viscosity inorganic paint 3 as a release agent inside. The mold 4 is stored in the molded mold 4 and subjected to high temperature firing to be cooled, and then the mold 4 is impregnated with a resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold release treatment method using a mold having a mold release agent applied to the inside and containing an impregnated body impregnated with a resin, and a method for manufacturing a superconducting magnet using the mold release treatment method. It is about.

[0002]

2. Description of the Related Art Conventionally, a superconducting magnet is manufactured by impregnating a resin after firing a coil formed by winding a superconducting wire at a high temperature. FIG. 7 is a sectional view showing an example of a conventional superconducting magnet impregnation method of this type, and FIG. 8 is a detailed sectional view of FIG.

In FIGS. 7 and 8, a superconducting magnet 1 has a coil 2 formed by winding a superconducting wire, molding and firing it.
After being housed in a mold 4 coated with an organic paint 8 as a release agent, an impregnating resin is injected into the mold 4 to perform an impregnation process.

However, in this case, since the organic coating material 8 is used as the release agent, it can withstand the impregnation treatment temperature, but cannot withstand the firing temperature of the compound superconducting wire such as Nb ₃ .Sn. .

Therefore, in the method of manufacturing the superconducting magnet 1, the coil 2 is housed in the mold 4 after the superconducting wire is wound and then heated and baked. However, when the coil 2 is small, there is no problem, but when the coil 2 is large, stress is applied due to deformation by its own weight or a fulcrum at the time of movement, resulting in deterioration of superconductivity. Occurs.

On the other hand, FIG. 9 is a sectional view showing a structural example of a conventional forced cooling type superconducting magnet. In FIG.
Forced cooling type superconducting magnet using compound superconducting wire 1
Then, in order to keep the coil 2 at an extremely low temperature, a metal sheet 9 such as an aluminum sheet is attached to the coil 2 when winding the compound superconducting wire.
A system is adopted that provides thermal conductivity by being rolled up and inserted between layers.

However, in this case, since the metal sheet 9 may be oxidized and deteriorated by the high temperature heat treatment at the time of firing the superconducting magnet, a method such as performing in an inert gas is adopted. Since the sheet 9 is made of metal, the insulating property of the superconducting magnet 1 is low and the work becomes complicated.

[0008]

As described above, the conventional superconducting magnet using the superconducting wire has problems in characteristics and manufacturing. A first object of the present invention is to provide a mold release treatment method capable of enhancing the mold release property of a coil that requires high temperature firing. Further, the second aspect of the present invention
It is an object of the present invention to provide a method for manufacturing a superconducting magnet capable of increasing the thermal conductivity of the coil and maintaining superconductivity.

[0009]

First, in order to achieve the first object, in the invention corresponding to claim 1, a mold release agent is applied to the inside and an impregnated body impregnated with a resin is housed. In a mold release treatment method using a mold, a low viscosity inorganic coating material is applied as a mold release agent.

Here, as the above-mentioned low-viscosity inorganic coating material, it is preferable to use boron nitride as described in claim 2, for example. As the low-viscosity inorganic coating material, for example, as described in claim 3, it is preferable to use hexagonal boron nitride.

Further, as the above-mentioned low viscosity inorganic coating material,
For example, as described in claim 4, it is preferable to use aluminum as the binder. Therefore, in the mold release treatment method of the invention corresponding to claim 1 to claim 4, a low-viscosity inorganic coating (boron nitride) is used as a mold release agent inside the mold for containing the impregnated body impregnated with the resin. , Or hexagonal boron nitride, or aluminum as a binder for inorganic paint)
By applying the above, since it is stable even at a high temperature in the manufacturing process, for example, exceeding 1000 degrees Celsius in a vacuum, the mold releasability that can withstand high temperature firing is obtained, and the coil in which the superconducting wire is manufactured is applied to this mold. After storing and firing, the impregnating resin can be impregnated and cured.

On the other hand, in order to achieve the first object,
In the invention corresponding to claim 5, in a mold release treatment method using a mold in which a mold release agent is applied to the inside and a resin-impregnated object is housed, a low-viscosity inorganic paint is used as the mold release agent. , Brushing, dipping, and / or spraying methods are used to obtain a uniform thickness.

In particular, for example, as described in claim 6, the coating thickness of the low viscosity inorganic coating is 50 μm.
It is preferably m or less. Further, for example, as described in claim 7, it is preferable that the solvent of the low-viscosity inorganic coating material is dried under reduced pressure at a temperature of 150 ° C. or lower before the heat treatment.

Therefore, in the mold release treatment method of the invention corresponding to claims 5 to 7, a low-viscosity inorganic paint is used.
By coating the inside of the mold with a method such as brushing, dipping, and / or spraying, the low-viscosity inorganic coating material can be easily applied to a fine portion having a uniform thickness.

Further, before the heat treatment, the solvent of the inorganic coating having a low viscosity at 150 ° C. or less is dried under reduced pressure, and the coating thickness is set to 50 μm or less, so that cracking or peeling of the coating which is likely to occur at the time of drying can be performed. Can prevent and withstand use at high temperature.

On the other hand, in order to achieve the second object,
First, in the invention corresponding to claim 8, in a method of manufacturing a superconducting magnet using a superconducting wire that needs to be fired by heat treatment, a coil formed by winding the superconducting wire is provided with a low-viscosity release agent inside. After being housed in a mold coated with an inorganic coating material, baked at a high temperature and cooled, the mold is impregnated with a resin.

Therefore, in the method for manufacturing a superconducting magnet of the invention according to claim 8, a coil formed by winding a superconducting wire that needs to be fired by heat treatment is housed in a mold coated with a low-viscosity inorganic paint. Since it is not necessary to move the coil after firing as in the conventional method by impregnating with resin after firing at high temperature, resin impregnation treatment is performed without stressing the coil and deteriorating superconductivity. be able to.

Further, in the invention corresponding to claim 9, in a method of manufacturing a superconducting magnet using a superconducting wire which needs to be fired by heat treatment, a winding core of a coil formed by winding the superconducting wire around the winding frame. Alternatively, a low-viscosity inorganic coating material, which is a release agent, is applied to the inside of the brim and is housed in a mold, and after high-temperature baking and cooling, the mold is impregnated with a resin.

Therefore, in the method for manufacturing a superconducting magnet according to the ninth aspect of the invention, by applying a low-viscosity inorganic coating to the inside of the winding core or the collar of the winding frame,
By separating the winding frame and the coil from each other, slippage is improved,
It is possible to reduce friction between the two when excited. This can suppress the occurrence of quench.

On the other hand, in the invention corresponding to claim 10, in the method for producing a forced cooling type superconducting magnet using a compound superconducting wire, when the compound superconducting wire is wound, a low-viscosity inorganic paint as a release agent is superconducting. After coating or impregnating a wire or coil and shaping it, high temperature firing is performed.

Here, it is particularly preferable that the coil is a conduit type for forced cooling. Therefore, in the method for manufacturing a superconducting magnet of the inventions corresponding to claims 10 and 11, a low-viscosity inorganic paint is applied to a superconducting wire or a coil or a conduit-type coil for forced cooling during winding of a compound superconducting wire. Or by impregnating and molding, then by high temperature firing,
Since the inorganic coating material has high thermal conductivity, the thermal conductivity of the coil can be increased and the cooling characteristics can be improved. Further, unlike the conventional case, by not inserting the metal sheet, not only does the insulation property have no problem, but the workability can be improved.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a cross-sectional view showing a method of manufacturing a superconducting magnet according to the present embodiment.
The same elements as those in are denoted by the same reference numerals.

In this embodiment, the superconducting magnet is manufactured as follows. That is, as shown in FIG.
The superconducting magnet 1 includes a coil 2 formed by winding a superconducting wire which needs to be fired by heat treatment, and a coil 2 housed in a mold 4 coated with a low-viscosity inorganic coating material 3 as a release agent. After the coil 2 and the mold 4 are baked at a high temperature and cooled, the mold 4 is impregnated with resin.

In this case, as the low-viscosity inorganic coating material 3,
It is preferable to use boron nitride, hexagonal boron nitride, or aluminum for the binder. Also,
It is preferable to apply the low-viscosity inorganic coating material 3 to the inside of the mold 4 with a uniform thickness by using a method such as brush coating, dipping, and / or spraying.

Furthermore, the coating thickness of the low-viscosity inorganic coating material 3 is preferably 50 μm or less. Furthermore, the solvent of the low-viscosity inorganic coating 3 is added to 1 degree Celsius before heat treatment.
It is preferable to dry under reduced pressure at a temperature of 50 degrees or less.

In the method of manufacturing the superconducting magnet 1 of the present embodiment as described above, the coil 2 formed by winding the superconducting wire which needs to be fired by heat treatment is molded into the mold 4 coated with the low-viscosity inorganic paint 3. It is not necessary to move the coil 2 after firing, unlike the conventional case, by housing in a container and firing at a high temperature and then impregnating with resin.

Therefore, the resin impregnation treatment can be performed without giving stress to the coil 2 to deteriorate the superconductivity. Further, at this time, by using the low-viscosity inorganic coating material 3 as the release agent applied to the mold 4, the inorganic coating material 3 can withstand high temperature firing.

Therefore, it is possible to obtain the releasability that can withstand the high temperature firing. Furthermore, the low-viscosity inorganic coating material 3 is applied to the inside of the mold 4 by using a method such as brush coating, dipping, and / or spraying.
Can be easily applied to a fine portion having a uniform thickness.

Furthermore, before the heat treatment, the solvent of the inorganic coating material 3 having a low viscosity at 150 ° C. or less is dried under reduced pressure, and the coating thickness is set to 50 μm or less, so that cracks of the coating material which are likely to occur during drying, Can prevent peeling and withstand use at high temperatures.

(Second Embodiment) FIGS. 2 to 4 are sectional views showing a method of manufacturing a superconducting magnet according to the present embodiment. The same elements as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, the superconducting magnet is manufactured as follows. That is, as shown in FIG. 2 to FIG. 4, the superconducting magnet 1 is formed by winding a superconducting wire, which needs to be fired by heat treatment, around a winding frame 5 inside a winding core 5 or a brim of a winding frame 5 of a coil 2. After applying a low-viscosity inorganic coating material 3 as a release agent to the mold 4 and storing it in the mold 4, the coil 4 and the mold 4 are baked at a high temperature and cooled, and then the mold 4 is pressed.
Is impregnated with resin.

In this case, as the low-viscosity inorganic coating material 3,
Similar to the first embodiment, it is preferable to use boron nitride, hexagonal boron nitride, or aluminum for the binder.

In the method of manufacturing the superconducting magnet 1 of the present embodiment as described above, the low-viscosity inorganic coating material 3 is applied to the inside of the winding core or the brim of the winding frame 5 so that the superconducting magnet 1 is excited. , The stress caused by the bonding of the superconducting wire and the winding frame 5 is removed.

As a result, the winding frame 5 and the coil 2 are released from each other, so that the slip is improved and improved, and the friction between the two can be reduced during excitation. Therefore, the occurrence of quench can be suppressed.

(Third Embodiment) FIG. 5 is a sectional view showing a method of manufacturing a superconducting magnet according to the present embodiment.
The same elements as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, the superconducting magnet is manufactured as follows. That is, as shown in FIG.
When the compound superconducting wire 6 is wound, the forced cooling type superconducting magnet 1 is formed by applying or impregnating the superconducting wire 6 or the coil 2 with a low-viscosity inorganic paint 3 which is a release agent, and then molding the coil 2 at a high temperature. Perform firing.

In this case, as the low-viscosity inorganic coating material 3,
As in the first and second embodiments, it is preferable to use boron nitride, hexagonal boron nitride, or aluminum for the binder.

In the method of manufacturing the superconducting magnet 1 of the present embodiment as described above, the low-viscosity inorganic coating material 3 is applied to the superconducting wire 6 or the coil 2 when the compound superconducting wire 6 is wound.
Since the inorganic coating material 3 has a high thermal conductivity by applying or impregnating it onto the molded article and then molding it at a high temperature,
It is possible to improve the cooling characteristics by increasing the thermal conductivity of.

Therefore, the superconducting wire 6 or the coil 2 can be kept at an extremely low temperature and the forced cooling type superconducting magnet 1 can be stably held. Further, unlike the conventional case, since the metal sheet is not housed, not only does the insulation property have no problem, but also the workability can be improved.

(Fourth Embodiment) FIG. 6 is a sectional view showing a method of manufacturing a superconducting magnet according to the present embodiment.
The same elements as those in FIG. 5 are designated by the same reference numerals.

In this embodiment, the superconducting magnet is manufactured as follows. That is, as shown in FIG.
The forced cooling type superconducting magnet 1 uses a low-viscosity inorganic paint 3 which is a release agent when the conduit 7 containing the compound superconducting wire 6 is laminated on the conduit 7 or the coil 2.
After being coated or impregnated with and molded, the conduit 7 or the coil 2 is fired at a high temperature.

In this case, as the low-viscosity inorganic coating material 3,
As in the first to third embodiments, it is preferable to use boron nitride, hexagonal boron nitride, or aluminum for the binder.

In the method for manufacturing the superconducting magnet 1 of the present embodiment as described above, when the conduit 7 having the compound superconducting wire 6 contained therein is laminated on the winding wire, the low-viscosity inorganic paint 3 is used.
The inorganic paint 3 is formed by applying or impregnating the conduit 7 or the coil 2 to the molded product and then firing it at a high temperature.
Has high thermal conductivity, the thermal conductivity of the conduit 7 and the coil 2 can be increased to improve the cooling characteristics.

Therefore, the conduit 7 and the coil 2 can be kept at an extremely low temperature and the forced cooling type superconducting magnet 1 can be stably held. Further, unlike the conventional case, by not inserting the metal sheet, not only does the insulation property have no problem, but the workability can be improved.

[0045]

As described above, according to the inventions corresponding to the first to fourth aspects, the mold having the mold release agent applied inside and containing the impregnated body impregnated with the resin is used. In the release treatment method, a low-viscosity inorganic coating (boron nitride or hexagonal boron nitride, or aluminum as a binder of the inorganic coating) was applied as a release agent, so high temperature baking is required. It is possible to provide a mold release treatment method capable of enhancing the mold release property of various coils.

On the other hand, according to the inventions corresponding to claims 5 to 7, in a mold release treatment method using a mold containing a mold release agent coated on the inside and containing an impregnated body impregnated with a resin, As a release agent, a low-viscosity inorganic paint was applied by brushing, dipping, and / or spraying to a uniform thickness. It is possible to provide a mold release treatment method capable of increasing the temperature.

On the other hand, according to the invention corresponding to claim 8,
In a method of manufacturing a superconducting magnet using a superconducting wire that needs to be fired by heat treatment, the coil formed by winding the superconducting wire is housed in a mold coated with a low-viscosity inorganic paint, which is a release agent. Since the mold is impregnated with the resin after the high temperature firing and the cooling, the resin can be impregnated without stressing the coil and deteriorating the superconductivity. It is possible to provide a method for manufacturing a superconducting magnet capable of improving thermal conductivity and maintaining superconductivity.

According to the invention corresponding to claim 9,
In a method of manufacturing a superconducting magnet using a superconducting wire that needs to be fired by heat treatment, inside a winding core or a collar of a coil frame formed by winding the superconducting wire around a winding frame, a low-viscosity release agent is used. The inorganic coating is applied and stored in a mold, and after high temperature baking and cooling, the mold is impregnated with resin, so that the friction between the reel and the coil is reduced to prevent quenching. It is possible to provide a method for manufacturing a superconducting magnet that can be suppressed and can enhance the thermal conductivity of the coil and maintain superconductivity.

Further, according to the inventions corresponding to claims 10 and 11, when the compound superconducting wire is wound, a low-viscosity inorganic paint is applied to or impregnated into the superconducting wire or the coil or the conduit type coil for forced cooling. Since it is molded and then fired at a high temperature, it can prevent problems in insulation, improve workability, enhance the thermal conductivity of the coil, and maintain superconductivity. A possible method for manufacturing a superconducting magnet can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 3 is a cross-sectional view showing a second embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 4 is a cross-sectional view showing a second embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 5 is a cross-sectional view showing a third embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 6 is a sectional view showing a fourth embodiment of a method for manufacturing a superconducting magnet according to the present invention.

FIG. 7 is a sectional view showing an example of a conventional superconducting magnet impregnation method.

FIG. 8 is a detailed cross-sectional view of FIG.

FIG. 9 is a sectional view showing a configuration example of a conventional forced cooling type superconducting magnet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Superconducting magnet, 2 ... Coil, 3 ... Inorganic paint, 4 ... Mold, 5 ... Reel, 6 ... Superconducting wire, 7 ... Conduit, 8 ... Organic paint, 9 ... Metal sheet.

Claims (11)

[Claims] 1. A mold release treatment method using a mold in which a mold release agent is applied to the inside and which contains a material to be impregnated with a resin, wherein a low viscosity inorganic coating material is applied as the mold release agent. A mold release treatment method characterized in that 2. The mold release treatment method according to claim 1, wherein boron nitride is used as the low-viscosity inorganic coating material. 3. The mold release treatment method according to claim 1, wherein hexagonal boron nitride is used as the low-viscosity inorganic coating material. 4. The mold release treatment method according to claim 1, wherein aluminum is used as a binder for the low-viscosity inorganic coating material. 5. A mold release treatment method using a mold in which a mold release agent is applied to the inside and which contains an impregnated body impregnated with a resin, wherein a low-viscosity inorganic coating material is applied by brushing as the mold release agent. A mold release treatment method, characterized in that the solution is applied to a uniform thickness using a method such as dipping, dipping, and / or spraying. 6. The coating thickness of the low viscosity inorganic coating is 50.
The release treatment method according to claim 5, wherein the release treatment is made to be less than or equal to μm. 7. The mold release treatment according to claim 5, wherein the solvent of the low-viscosity inorganic paint is dried under reduced pressure at a temperature of 150 ° C. or lower before heat treatment. Method. 8. A method for manufacturing a superconducting magnet using a superconducting wire which needs to be fired by heat treatment, wherein a coil formed by winding the superconducting wire is coated with a low-viscosity inorganic paint as a release agent on the inside. A method for manufacturing a superconducting magnet, characterized in that the mold is housed in a mold, baked at a high temperature and cooled, and then the mold is impregnated with a resin. 9. A method for manufacturing a superconducting magnet using a superconducting wire that needs to be fired by heat treatment, comprising: a mold formed by winding a superconducting wire around a winding frame, inside a winding core or a collar of the winding frame. A method for manufacturing a superconducting magnet, characterized in that a low-viscosity inorganic coating material, which is an agent, is applied and stored in a mold, and after high temperature firing and cooling, the mold is impregnated with a resin. . 10. A method for manufacturing a forced cooling type superconducting magnet using a compound superconducting wire, comprising applying or impregnating a superconducting wire or a coil with a low viscosity inorganic coating which is a release agent when winding the compound superconducting wire. A method for manufacturing a superconducting magnet, characterized in that high temperature firing is performed after molding. 11. The method of manufacturing a superconducting magnet according to claim 10, wherein the coil is a conduit type for forced cooling.