JPH0214802A - Production of oxide superconducting material - Google Patents

Abstract

PURPOSE:To form a dense and homogeneous calcined oxide superconducting layer on at least an inner surface of a hollow member, such as pipe, in a short time and obtain the subject superconducting material by forming an electrodeposition layer on the inner surface of the hollow member by electrophoretic deposition using specific a constitution. CONSTITUTION:A hollow member 1 (e.g., pipe made of Ni) having electric conductivity imparted thereto is used as the inner surface of at least a hollow part and one or more spacers 8 consisting of an insulating material (e.g., acrylic resin) are provided in the hollow part. An electrode 7 is supported by the spacers 8 and arranged so as to pass through the central part of the hollow part. For example, the above- mentioned hollow member 1 is then dipped in an electrodeposition liquid 3 prepared by dispersing a superconducting powder (e.g., powder of a composition YBa2Cu3Ox) or a precursor powder of a superconductor and filled in the interior of the hollow member 1. In this state, a current is passed through an electrically conductive part and electrode 7 to carry out electrophoretic electrodeposition and form an electrodeposition layer 4 on the inner surface of the hollow member 11. The hollow member 11 is then taken out of the electrodeposition liquid 3 and heat-treated to form an oxide superconducting layer 9.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for producing an oxide superconducting material, which is currently being developed for use in windings of superconducting magnets, power transmission lines, and the like.

``Conventional Technology J'' Oxide superconductors, which have been discovered in recent years, are known to have an extremely high critical temperature at which they transition from a normal conducting state to a superconducting state.This type of oxide superconductor is The critical temperature is extremely high compared to conventional alloy-based superconductors or intermetallic compound-based superconductors, and the general formula Y -B a-Cu
-0, B1-5 t-Ca-CuOlT I-Ca-B
Oxide superconductors represented by a-Cu-0 and the like have attracted attention as having a critical temperature exceeding the liquid nitrogen temperature, and their application development is progressing.

By the way, in the conventional method of forming an oxide superconducting film on a metal or ceramic substrate, a printing material is created by adding a solvent such as pine oil or an organic binder to oxide superconductor powder. A method is known in which a material for printing is screen printed on a substrate and then fired.

Alternatively, a coating solution may be prepared in the same manner as in the production of the printing material, and the coating solution may be sprayed onto the surface of the substrate, or the substrate may be immersed in this coating solution and then pulled.
A method is known in which a coating liquid is formed on the surface and then fired.

"Problems to be Solved by the Invention" However, although the screen printing method can be applied to parts with simple shapes such as the surface of a flat plate or the outer surface of a cylinder, it cannot be applied to the outer peripheral surface of a wire rod or the inner peripheral surface of a pipe. There is a problem in that it cannot be applied to substrates with shapes that include portions with large curvature, such as, and substrates with complex shapes that have uneven portions. Further, the thickness of a film that can be formed by screen printing is limited to about 200 μm, and there is a problem in that it is difficult to form a thick superconducting film with a thickness of 200 μm or more.

Furthermore, in the above-mentioned coating method and dipping method, when using a substrate with a complicated shape, if the viscosity of the coating liquid is increased, it becomes difficult to uniformly apply the coating liquid to every corner of the substrate. However, if the viscosity of the coating liquid was lowered, the coating liquid would run off when the substrate was pulled out of the coating liquid, making it impossible to apply the coating uniformly to the surface of the substrate, which caused the problem that it could not be applied to substrates with complex shapes. . Furthermore, the base material is pipe-shaped, etc.
In particular, in the case of a small diameter or long base material, it is difficult to uniformly form a superconducting layer on the inner surface of the pipe. In addition, when forming a coating layer on the surface of a base material and then performing heat treatment to bake the substances contained in the coating layer to generate an oxide superconducting layer, resin components such as binders contained in the coating layer may be burned. Another problem was that the oxide superconducting layer cracked or peeled off from the base material.

The present invention has been made to solve the above problems,
A dense and uniformly thick oxide superconducting layer can be formed in a short time on at least the inner surface of a hollow member such as a pipe,
It is an object of the present invention to provide a method that can easily control the thickness and form an extremely thick superconducting layer of about 1 mm.

"Means for Solving the Problems" In order to solve the problems described above, the present invention uses a hollow member in which at least the inner surface of the hollow part is made conductive, and in the hollow part, one or more spacers made of an insulating material are provided. The hollow member is filled with an electrodeposition liquid in which superconducting powder or superconductor precursor powder is dispersed. In this state, electricity is applied to the conductive part of the hollow member and the electrode to perform electrophoretic electrodeposition to form an electrodeposited layer on the inner surface of the hollow member, and then heat treatment is performed on the inner surface of the hollow member.
The solution was to form a sintered oxide superconducting layer.

"Operation" An electrodeposited layer is formed on the conductive portion of the hollow member by electrophoretic electrodeposition, and an oxide superconducting layer is generated by heat-treating this. According to the electrophoretic electrodeposition method, a dense electrodeposited layer with a uniform thickness can be obtained even on the inner surface of a hollow member, so that a uniform and dense oxide superconducting layer is formed. Further, since the electrodeposition layer can be adjusted to a desired thickness by controlling the electrodeposition conditions, an oxide superconducting layer having a thickness suitable for the intended use can be easily obtained. Note that electrophoretic electrodeposition is performed by filling the interior of the hollow member with an electrodeposition liquid and arranging the electrode so as to pass through the center of the hollow part, so the distance between the conductive part of the hollow member and the electrode is constant. This results in an electrodeposited layer of uniform thickness. Therefore, if this electrodeposited layer is fired, a dense and uniformly thick oxide superconducting layer will be formed on the entire inner surface of a hollow member such as a long pipe.

The present invention will be explained in more detail below.

1 to 5 are diagrams for explaining an example of manufacturing a superconducting material by the method of the present invention. In the method for producing a superconducting material according to this example, first, a pipe-shaped hollow member l is immersed in an electrodeposition liquid 3 filled in an electrodeposition tank 2, and electrophoretic electrodeposition is performed to coat the inner and outer peripheral surfaces with a third layer. As shown in the figure, electrodeposited F? f! 4.5 to create a superconducting material 6 whose cross-sectional structure is shown in FIG.

Preferably, the constituent material of the hollow member 1 used in any of the above is a noble metal having a melting point of 800° C. or higher and good oxidation resistance, or a noble metal having a melting point of 800° C. or higher and good oxidation resistance.
, Nb1W, single metals such as Cu, Cu-Ni alloy, C
u-A I alloy, N i-A I alloy, T i-V
metal alloys, monel metals, stainless steel, chromel, allomel, kanthal, etc. are used, as well as quartz glass, zirconia, YSZ, alumina, sapphire, titanate compounds such as strontium titanate, and ceramics such as magnesia and titanium oxide. A hollow space such as a vibrator in which a conductive coating such as AFCsNi or Cu is applied to at least the inner peripheral surface of the base material using a thin film forming method such as electroless plating method, sputtering method, ion blating method, or vacuum evaporation method. member is used. In addition, the hollow member l
The shape is not limited to a pipe shape, and a cylindrical member with a bottom such as a cap, or a hollow member having a plurality of passages formed inside a block-shaped main body may be used.

The electrodeposition liquid 3 used is one in which oxide superconducting powder is dispersed in a dispersion medium. The superconducting powder used here is A
-B -Cu-0 (A is Y, La, Ce.

An oxide superconductor represented by the following composition: one or more elements of group 111a of the periodic table, such as Yb, Sc, and Er, or Bi, and B represents an element of group IIa of the periodic table, such as Ba, Sr, and Ca. powder, its precursor powder, or a mixed powder thereof is used.

As a method for creating this superconducting powder, for example, Y-
When using B a-Cu-0 based oxide superconductor,
Y x O3 powder, BaCO3 powder and CuO powder:
Ba:Cu=I:2:3 (molar ratio) is uniformly mixed to form a mixed powder, and then this mixed powder is heated to a concentration of 500 to 1000 in the air or oxygen atmosphere.
Preferably, a powder mixing method is used in which a superconducting powder is produced by calcining the powder at a temperature of 0.degree. The heating performed after firing the calcined powder is performed in an oxygen atmosphere,
It is preferable to set it as 1 to several tens of hours at 800-1000 degreeC. In addition, when using a Bi-9r-Ca-Cu-0 system superconductor, for example, Bi oxide powder, Cu oxide powder, Ca carbonate powder, and St carbonate powder are used as Bi-9r-Ca-Cu-0 superconductors.
s r:ca:Cu-1:1:1:2 (molar ratio) is uniformly mixed to form a mixed powder, and then this mixed powder is placed in air or oxygen atmosphere,
A powder mixing method in which a calcined powder is obtained by calcining at 50 to 850°C for several minutes to several tens of hours, and then the calcined powder is subjected to a series of operations of compaction, heating, and pulverization once or twice or more. is suitable.

By the way, the method for producing the superconducting powder is not limited to the powder mixing method, and a coprecipitation method or a sol-gel method may be used. Further, instead of the superconducting powder in the electrodeposition liquid 3, the above-mentioned calcined powder (precursor powder) may be used. Furthermore, the superconducting powder used here has a particle size of 50 μm or less, and in particular, powder with a particle size of 30 μm or less is preferably used in order to prevent the powder particles from settling and to disperse them uniformly.

By the way, as the dispersion medium, it is preferable to use acetone, methyl ethyl ketone, formamide, N--N dimethyl formamide, isopropyl alcohol, n-butyl alcohol, diethyl ketone, dipropyl ketone, or the like.

The fireflies of the oxide superconducting powder in this dispersion medium IQ are 1
It is desirable to set it as the range of ~500g.

If the amount of superconducting powder is more than 5009/(), the superconducting powder will not be electrodeposited on the surface of the substrate in a dense and uniform state, and if the amount of superconducting powder is less than Ig/f!, the electrodeposition efficiency will deteriorate. Further, in order to disperse the superconducting powder in the dispersion medium, it is desirable to perform ultrasonic stirring, and it is also possible to add a small amount of water, gelatin, starch, electrolyte, etc. to the dispersion medium and perform the stirring operation. In this case, the amount of water contained in the dispersion medium is 5 vol.% or less, more preferably 1 vol.
, % or less. The amount of water in the dispersion medium is 5vol. % or less, no gas is generated due to electrolysis of water, and the superconducting powder becomes well dispersed. Water content is 5vol. % or more, agglomeration of the superconducting powder occurs and it becomes impossible to uniformly disperse the superconducting powder in the dispersion medium. Note that, if necessary, a material such as titanium oxide, which serves as a sintering aid for the oxide superconductor, is added to the electrodeposition liquid 3.

In order to form an electrodeposited layer 4 on the inner and outer surfaces of a pipe-shaped hollow member l using the electrophoresis apparatus shown in FIG. Insert the electrode 7 of. Further, a plurality of spacers 8 are inserted into the hollow member I in advance. These spacers 8 are
As shown in FIG. 5, the hollow member 1 is made of a plate-shaped body slightly longer than the inner diameter thereof, and a support hole 8a having a size through which the electrode 7 can be inserted is formed in the central portion in the longitudinal direction. The spacer 8 is made of an insulating material such as resin or ceramic, or a metal plate whose surface is insulatingly coated. Note that specific examples of the constituent materials of the spacer 8 include insulating resins such as polyethylene, vinyl chloride, acrylic, and polyester, and ceramics such as alumina, quartz, zirconia, magnesia, and glass. Moreover, the thickness of the spacer 8 is 0.1~
Approximately 5 mm is preferable. This is because the spacer 8 needs to have a thickness of 0.1 mm or more in order to stably function as a spacer to prevent short circuits caused by contact between the electrode 7 and the hollow member l. This is because the thickness is preferably about 5 mm or less, considering that no electrodeposited layer is formed on the portion that comes into contact with the electrode.

The spacers 8 are arranged at appropriate intervals along the length direction of the hollow member I, and each support hole 8a is arranged on the central axis of the hollow member l, so that the hollow part inside the hollow member 1 has some elasticity. It is inserted and fixed in a deformed state. Further, a linear electrode 7 is inserted through the support hole 8a of each hollow member I and inserted into the hollow member I.

In this state, a voltage is applied to the hollow member 1 and the electrode 7. When applying this voltage, a Y-B a-Cu-0 type superconductor is generated, and the dispersion medium is acetone, methyl ethyl ketone, porumamide, N-N dimethylformamide, isopropyl alcohol, n-butyl When alcohol is used, the hollow member 1 is used as the cathode and the electrode 7 is used as the anode, while when diethyl ketone or dipropyl ketone is used as the dispersion medium, the hollow member 1 is used as the anode and the electrode 7 is used as the cathode. We will perform electrophoretic electrodeposition.

In addition, when producing a B i-S r-Ca-Cu-0 system superconductor and using dimethyl ketone, N-N dimethylformamide, isopropyl alcohol, etc. as a dispersion medium, the hollow member 1 is used as a cathode. and electrode 7
Perform electrophoretic electrodeposition using as an anode.

In the electrophoretic electrodeposition described above, either a constant voltage method or a constant current method is possible, and the current waveform can be a direct current, a pulse, or a pulse in which the hollow member 1 temporarily becomes a cathode or an anode. Current waveforms such as AC/DC superimposed and intermittent current waveforms are possible. When using the constant voltage method, it is sufficient to apply a voltage of IV or more, and when using the constant current density method, it is desirable that the current density is in the range of 1 to 500 μA/cm'. Note that as the electrode 7, ordinary electrode materials such as a platinum plate, a stainless steel plate, and a carbon electrode can be used.

As mentioned above, by applying a voltage between the hollow member l, which becomes an anode or a cathode, and the electrode 7, the superconducting powder dispersed in the electrodeposition liquid 3 is charged, and the hollow members charged at different poles are charged. Electrodeposited on the surface of 1. Then, on the inner and outer peripheral surfaces of the hollow member l, a dense electrodeposited layer 4 made of superconducting powder is formed.
5 is formed, and a superconducting material 6 shown in FIG. 2 is obtained.

Once the electrodeposition layer 4.5 of a predetermined thickness is formed in the electrodeposition WI 2, the superconducting material 6 is pulled up from the electrodeposition tank 2 and then dried with hot air to remove the dispersion medium remaining on the surface. do.

Next, this superconducting material 6 is subjected to heat treatment. In this heat treatment, the superconducting material 6 is heated at 800 to 1000°C for several minutes to several IO hours in the air or oxygen atmosphere, and then
This is done by cooling to room temperature. In addition, Y −
When using B a-Cu-0 based oxide superconductor,
During the heat treatment, it is preferable to perform the heat treatment while sending air, O, or gas into the inside of the superconducting material 6.

By this heat treatment, the electrodeposition layer 4 on the inner and outer surfaces of the hollow member I,
5 is sintered, and an oxide superconducting layer 9. ■0 is formed. Through the above operations, it is possible to obtain a pipe-shaped superconducting material A having oxide superconducting layers 9 and 10 formed on its inner and outer circumferential surfaces, as shown in FIG. 4. This superconducting material A can be used after being cooled to below a critical temperature using a coolant such as liquid nitrogen or liquid helium. During this cooling, the internal space of the hollow member 1 can be used as a refrigerant circulation space, and the internal space of the hollow member I can be made into an atmosphere free of moisture, or the internal space can be filled with zero water. It is possible to prevent the properties of the oxide superconductor from deteriorating by sending a gas.

If superconducting material A is manufactured using the method described above, since the electrodeposited layers 4 and 5 are sintered to form the oxide superconducting layer 9 and 10, defects such as cracks and peeled parts will not occur. A superconducting material A having a uniform and dense oxide superconducting layer 9.10 can be obtained. Furthermore, the electrodeposited layer 4.5 formed on the inner peripheral surface and the outer peripheral surface of the hollow member l can be set to a desired value by adjusting the applied voltage and electrodeposition time, so that the oxide layer 4.5 can be formed with a desired thickness. A superconducting layer 9.10 can be produced. Further, according to electrophoretic electrodeposition, an electrodeposited layer having a thickness of 200 μm or more can be easily produced, so that a thick superconducting layer can be easily obtained. By the way, if the hollow base material l is formed from a material having a coefficient of thermal expansion larger than that of the oxide superconductor, the hollow member l will shrink when cooled after heat treatment.
Compressive stress acts on the superconducting layer 9 generated on the inner circumferential surface of the superconducting layer 9, and the density of the superconducting layer 9 is improved, so that a denser superconducting layer 9 is generated.

Although the plate-shaped spacer 8 was used in the example described in Moe, the shape of the spacer is not limited to a plate-shaped one as long as it can be inserted into the hollow body 1 and can support the electrode 6. Code 1 in figure 5! It may be formed into a cross shape or the like as shown in Figure 4.

Incidentally, an oxide superconducting layer can be formed on the inner peripheral surface of a coil-shaped hollow member using the apparatus shown in FIG.

In this case, spacers and electrodes are arranged inside a pipe-shaped hollow member, and then the hollow member is processed into a coil shape to create a coil.The outer circumferential surface of this coil is coated with insulating resin, and only the inner circumferential surface is conductive. By applying a voltage to the inner circumferential surface and the electrode 7, an electrodeposited layer is formed on the inner circumferential surface of the coil, and by sintering this, an oxide superconducting layer is formed on the inner circumferential surface. Coils can be manufactured.

The apparatus shown in FIG. 7 shows another example of the apparatus used to implement the present invention.

The device of this example includes a pipe-shaped hollow member 2 having electrical conductivity.
Plugs 21 and 21 made of resin such as rubber are removably fitted into both ends of the 0, and a T-shaped flow pipe 22 is attached to each of the plugs 21 and 21, and an on-off valve 23 is attached to each flow pipe 22. Assemble and connect the flow pipe 22.22 to the liquid circulation pump P and the auxiliary tank T, and also connect the flow pipe 22.22 and the hollow member 2.
A wire-shaped electrode 24 is provided by penetrating the hollow member 2.
0 and the electrode 24 are connected to a power source 26.

7 is a plug made of resin that closes one end of the flow pipe 22, and the electrode 24 is provided so as to pass through the plug 27 and into the hollow member 20. There is.

In the apparatus shown in FIG. 7, the electrodeposition liquid 3 used in the previous embodiment is circulated by a circulation pump P via the hollow member 20, the flow pipe 22, 22, and the auxiliary tank T, and the electrode 24 and the hollow member Electrification is applied to perform electrophoretic electrodeposition. By this electrophoretic electrodeposition, an electrodeposition layer can be formed on the inner peripheral surface of the hollow member 20.

If this electrodeposited layer is heat-treated in the same manner as in the previous example, a pipe-shaped oxide superconducting material B having an oxide superconducting layer 29 on the inner peripheral surface can be formed as shown in FIG. .

By using the device of this example, effects equivalent to those of the previously described example can be obtained. Furthermore, since the electrodes 24 are arranged along the central axis of the hollow member 20 so that the distance between the electrodes 24 and the inner circumferential surface of the hollow member 20 is the same, and the distance between the electrodes is constant, the electrodes are electrodeposited. Even if the superconducting layer 20 is extremely long, a dense superconducting layer 29 having a uniform thickness can be formed over the entire inner circumferential surface of the superconducting layer 20. In addition, by sequentially replenishing the auxiliary tank T with superconducting powder before electrophoretic electrodeposition, it is possible to perform the process for a long time without causing uneven electrodeposition.
Since electrodeposition is carried out while flowing the electrodeposition liquid 3 inside the pipe-shaped hollow member 20, there is an effect that the electrodeposition liquid can be reliably supplied to every corner of the inside of the hollow member 20 for electrodeposition.

Furthermore, after forming the oxide superconducting layer 29 in the hollow member 20, a solution containing polyimide resin or the like dissolved in a solvent is circulated through the hollow member (2) to coat the surface of the oxide superconducting layer 29 with the polyimide resin. It can also be covered with a layer.

By covering the oxide superconducting layer 29 with the coating layer in this way, the Y-B a-Cu-0 based superconducting layer 2
9 can prevent deterioration of superconducting properties due to moisture, maintain initial properties for a long period of time, and
It is possible to suppress the peeling phenomenon and the occurrence of cracks in the superconducting layer 29.

"Example!" Superconducting oxide powder with the composition Y + B atc LI30
Prepare an electrodeposition liquid dispersed at a ratio of 1.5 g, and prepare a Ni pipe with an inner diameter of 5 mm, a wall thickness of 0.5 ml, 1%, and a length of 1 m. Inside this pipe, an acrylic rod-shaped spacer is placed about 3 am. Ni wire electrodes with a diameter of 0.2 mm were inserted into the support hole at the center of the spacer.

Next, this pipe was set in an electrodeposition apparatus instead of the hollow member 20 shown in FIG. 7, and while the electrodeposition liquid was flowing inside the pipe with a circulation pump, a voltage of 300V was applied using the pipe as a cathode.
An electrodeposited layer was formed on the inner surface of the pipe by performing DC constant voltage electrolysis by applying a voltage of 2 minutes for 2 minutes.

After the electrodeposition was completed, the pipe was dried, heated at 950° C. for 2 hours in oxygen gas, and then slowly cooled to room temperature at a rate of 400° C./hour to obtain an oxide superconducting material.

Regarding the oxide superconducting layer formed on the inner surface of this pipe,
We extracted 10 parts along the length of the pipe, observed the cross section with a microscope, measured the film thickness, and measured the critical temperature (Tc), and found that the film thickness was 240±
It showed a uniform value of 30 μm and Tc of 91 K, confirming that it was an excellent oxide superconducting layer.

"Example 2" A spacer and an electrode were arranged on a pipe made of the same material and having the same shape as the Ni pipe used in Example I, and this pipe was processed into a coil with a winding diameter of 5 cm and a pitch of 1 cm. A coiled oxide superconducting material was obtained by electrodeposition and firing under the same conditions as above.

When the film thickness of the superconducting layer of this oxide superconducting material was measured in the same manner as in Example I, the film thickness was 230 ± 35 μm, indicating that an oxide superconducting layer with a uniform thickness could be produced. Tc was 91K, confirming that it was an excellent oxide superconducting layer.

"Example 3" I3i:Sr:Ca:Cu=I:I instead of the Y-Ba-Cu-0-based superconducting powder used in Example 1
Using Bi-based oxide superconducting powder with an average particle size of 6.3 μm and having a composition of :I:2, the electrolytic voltage was set at 100 V, and the sintering process was performed at 860°C in the atmosphere for 12 hours. A pipe-shaped oxide superconducting material was manufactured under the same conditions as in Example 1.

When the thickness of the superconducting layer of the obtained oxide superconducting material was measured, it was found to be 250±20 μm, indicating that it was formed to a uniform thickness, and the Tc was 72K.

"Example 4" A coiled oxide superconducting material was produced using the coiled pipe used in Example 2, the Bi-based superconducting powder used in Example 3, and the processing conditions performed in Example 3. did.

When the thickness of the superconducting layer of the obtained oxide superconducting material was measured, it was found to be 240±30 μm, and T c was 72K.

"Effects of the Invention" As explained above, the present invention forms a dense electrodeposited layer on at least the inner surface of a hollow member by electrophoretic electrodeposition, and heat-treats this to form a sintered oxide superconducting layer. Therefore, a superconducting material having a dense and homogeneous oxide superconducting layer free of defects such as clutter due to shrinkage during sintering can be obtained. Furthermore, since an electrodeposited layer with high adhesion to the hollow member is formed by electrophoretic electrodeposition and then sintered, the thickness of the superconducting layer can be precisely controlled by controlling the electrodeposition conditions. . Further, electrophoretic electrodeposition allows a superconducting layer with a thickness of 2001 tm or more to be formed in a short time, and has the effect of improving manufacturing efficiency.

Furthermore, since the hollow member is filled with electrodeposition liquid and electrodeposition is performed between the electrodes placed in the center of the hollow part, the distance between the electrodes becomes uniform, and even if the hollow member is caught in a long length, the entire inner surface of the hollow member is densely coated. It is possible to produce an oxide superconducting layer with a uniform thickness.

The obtained oxide superconducting material can be used by cooling it below the critical temperature by flowing a refrigerant inside the hollow member, and at the same time, it can be used by cooling it below the critical temperature by flowing a refrigerant inside the hollow member. It can also be used while sending etc.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of a 4° device used to carry out the method of the present invention, Fig. 2 is a sectional view showing the spacer mounting state, Fig. 3 is a sectional view showing iXX attachment, Figure 4 is a cross-sectional view showing the oxide superconducting material, Figure 5 is a side view showing how the spacer is attached, Figure 6 is a side view showing another example of the spacer, and Figure 7 is a diagram for carrying out the present invention. FIG. 8 is a block diagram showing another example of the apparatus used. FIG. 8 is a sectional view showing an oxide superconducting material manufactured with the apparatus shown in FIG. A, B... Oxide superconducting material, 1.20... Hollow member (pipe), 3... Electrodeposition liquid, 4.5... Electrodeposition layer, 7.
24... Electrode, 8.11... Spacer, 9.
10.29...Superconducting layer.

Claims (1)

[Claims] A hollow member having conductivity imparted to at least the inner surface of the hollow part is used, one or more spacers made of an insulating material are installed in the hollow part, and an electrode is supported by the spacer and passes through the center of the hollow part. At the same time, the hollow member is filled with an electrodeposition liquid in which superconducting powder or superconductor precursor powder is dispersed, and electricity is applied to the conductive portion of the hollow member and the electrode to perform electrophoretic electrodeposition. A method for producing an oxide superconducting material, comprising forming an electrodeposited layer on the inner surface of the hollow member, and then performing heat treatment to form a sintered oxide superconducting layer on the inner surface of the hollow member.