JPS63307151A - Oxide ceramics based superconductor and production thereof - Google Patents

Abstract

PURPOSE:To obtain complex oxide ceramics based superconductor having good stability and large electric current value and readily causing no damage by a fire, by constituting a complex consisting of a secondary sintered compact of a super conductive powder and ordinary conductive metal fine powder and a stabilized metal substance. CONSTITUTION:The above-mentioned oxide ceramic based superconductor is composed from a secondary sintered compact 1 of a superconductive powder and ordinary conductive metal fine powder having melting point lower than secondarily sintering temperature and stability metal product 2 containing ordinary conductive metal having melting point higher than the above-mentioned secondarily sintering temperature. The above- mentioned superconductive powder is preferably a mixed powder containing one or more kind of powders selected from copper-oxygen based compound powder, barium- oxygen based compound and/or strontium-oxygen based compound powder, yttrium- oxygen based compound powder, lanthanum-oxygen based compound powder and scandium-oxygen based compound powder. The above-mentioned ordinary conductive metal fine powder is preferably especially fine powder of zinc. The stabilized metal substance 2 is preferably silver, silver alloy, copper (copper free from oxygen), copper alloy substance, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an oxide ceramic superconducting conductor, particularly to a stabilized composite oxide ceramic superconducting conductor and a method for manufacturing the same.

<Prior art> Conventionally, superconducting conductors are Nb-Ti, Nb-Zr, Nb-
Alloy systems such as Ti-Zr, Nb3Sn, (Nb-Ti)
Compound systems such as 3Sn%V3Ga have been proposed, but
All of these superconducting critical temperatures (Tc) are below 20. Also, although it has not been put to practical use, Tc
Even if Nb3Ge has the highest value, it is at most 24 or less.

Therefore, these superconducting conductors have no choice but to use liquid helium as a coolant. This liquid helium has a low boiling point ((4,2K)), is very expensive, and requires advanced insulation techniques to keep it in a liquid state.

Recently, La-Ba-Cu-0 series, La-3r-Cu-0
In layered perovskite ceramics such as Y-Ba-Cu-0, Y-Ba-Cu-0, and 5c-Ba-Cu-0, high-temperature oxide ceramic superconductors with critical temperatures (Tc) of 35 to 175 were discovered. ing. However, this oxide ceramic superconductor has not yet been sufficiently made into a conductor, and naturally its critical current density (Jc) is still at a low level.

However, if an oxide ceramic superconductor can be used, it is possible to use liquid nitrogen (boiling point 77K) as a refrigerant, which is inexpensive and does not require advanced insulation technology because of its high critical temperature (T' c ). The overall cost is dramatically reduced compared to conventional superconducting conductors using liquid helium.

However, even if a large current can be passed through such an oxide ceramic superconducting conductor, if the superconducting state of the superconductor is broken and it becomes a normal conducting state, the conventional N b Ti
, N b3S n As with superconducting conductors, unless a metal with very low non-resistance (such as copper) is used as a stabilizing material to stabilize the conductor, the normal conductivity of oxide ceramic superconductors will decrease. The specific resistance is copper specific resistance = 10
-'Ω·cm (=10 −3 Ω·cm), which is very large compared to 77K, so there are problems such as a high possibility of burnout.

However, conventional Cu-stabilized Nb-Ti or Nb3S
In the n-type superconducting conductor, both the stabilizing material and the superconductor are metals, and the electrical adhesion is particularly good, the interfacial electrical resistance is very small, and the stabilizing material Cu functions satisfactorily in practical use.

On the other hand, oxide ceramic superconductors have poor adhesion with metals, and in particular have an electrical interfacial resistance of about 10 Ω/Cm.
It even reaches 2. This poses a problem in that if the superconducting state of the oxide ceramic superconductor is broken, the interfacial resistance is so large that no current will transfer to the stabilizing material, and the conductor may burn out.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a material with good adhesion between an oxide ceramic superconductor and a stabilizing material, good stability, and It is an object of the present invention to provide a novel oxide ceramic superconducting conductor compounded with a stabilizing material, which has a large current value and does not burn out easily, and a method for manufacturing the same.

<Means for solving the problem> According to the first aspect of the present invention, the present invention is characterized by having a secondary sintered body of superconducting powder and normal conductive metal fine powder, and a stabilizing metal body. An oxide ceramic-based superconducting conductor is provided.

According to a second aspect of the present invention, a mixed powder of a superconducting powder and a normal conductive metal fine powder having a melting point below the secondary sintering temperature, and a mixed powder having a melting point above the secondary sintering temperature After compounding with a stabilizing metal body containing a normal conductive metal,
A method for manufacturing an oxide ceramic superconducting conductor is provided, which comprises performing secondary sintering.

Further, it is preferable that the superconducting powder is a raw material powder of an oxide ceramic superconductor before primary sintering.

Further, the superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. Preferably, it is a mixed powder containing one or more types selected from the group consisting of compound powders.

Further, the superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. It is preferable to use an oxide ceramic superconductor powder produced by primary sintering and then pulverizing a mixed powder with one or more compound powders selected from the group consisting of compound powders.

Further, the secondary sintered body has a composition formula MM' 2Cu3Oy-6 (where M is YlS
c, and La, Gd%Dy, Ho, Er.

At least one member selected from the group consisting of lanthanides such as Yb, Lu, and Eu, M' is at least one member selected from the alkaline earth metal group, and δ represents deficient oxygen. It is preferable that the

Preferably, the composite is formed by inserting the superconducting powder-metal mixed powder into the tubular stabilized metal body, compacting it, and forming it into a wire or tape.

Further, the consolidation is preferably carried out by drawing by swaging, drawing or rolling.

In addition, the above-mentioned compositing is carried out by dispersing and mixing the superconducting powder-metal mixed powder in a solution or colloidal dispersion of an organic polymer compound which itself substantially disappears by thermal decomposition, and then converting the superconducting powder-metal mixture into a stabilized metal. Preferably, it is applied by coating.

The present invention will be explained in more detail below.

The superconducting powder used in the present invention may be a raw material powder before primary sintering that becomes an oxide ceramic superconductor after primary sintering, or an oxide ceramic superconducting powder that has already been sintered and has superconductivity. It can be anything.

Here, the oxide ceramic superconductor refers to a ceramic superconductor, including Y, Sc, La, and Gd.
, Dy, ) (o, Er.

At least one element selected from the group consisting of lanthanides such as Yb, Lu, Eu, at least one element selected from the group of alkaline earth metals such as Ca, Sr, Ba, Cu element, and 0 element. It is composed of
It is characterized by a significantly higher critical temperature than conventional alloy-based superconductors. Examples of such oxide ceramic superconductors include La-3r-Cu-0 soft compounds, La-5r-Cu-0 soft compounds mixed with a trace amount of Ca, and M
-Ba-Cu-0 soft compound (where M is Y, Sc, and La, Gd%Dy, Ho%Er, Yb.

At least one member selected from the group consisting of lanthanides such as Lu and Eu is preferred, and among these, MM' 2Cu3 having a layered perovskite structure is particularly preferred.
O7-5 (where M is the same element as above, M' is at least one selected from the group of alkaline earth metals, and δ represents deficient oxygen).

These can be manufactured by sintering the element or its oxide as a raw material by a powder mixing method, by coprecipitation mixing method, or by spray drying.

Here, as the raw material powder before primary sintering that becomes the oxide ceramic superconductor after secondary sintering, the above-mentioned Y, Sc, La, Gd, Dy, Ho, Er, Yb, Lu, Eu
At least one element selected from the group consisting of lanthanides such as, at least one element selected from the group of alkaline earth metals such as Ca, Sr, Ba, etc., and Cu element or oxides of these elements or oxygen. Any mixed powder of compounds may be used, such as copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium. −
Preferably, it is a mixed powder containing one or more types selected from the group consisting of oxygen-based compound powders. The particle size of the raw material powder is preferably as fine as 1 to 5 μm.

The oxide ceramic superconductor powder is preferably produced by pulverizing the oxide ceramic superconductor obtained by primary sintering the raw material powder described above.

When performing the above-mentioned secondary sintering, it is preferable to sinter for a long time (5 to 10 hr) in air or oxygen atmosphere, crush it, and repeat re-sintering, and the secondary sintering temperature is 850°C. ~
The temperature is preferably 1050°C.

The normal conductive metal fine powder used in the present invention is a normal conductive metal fine powder having a melting point below the secondary sintering temperature.

The fine powder of a normally conductive metal having a melting point below the secondary sintering temperature may be any fine powder containing one or more low melting point metals having a melting point below the secondary sintering temperature, such as A fine powder containing one or more of , zinc, tin, lead, indium, aluminum, or an alloy thereof is preferable. Particularly preferred is fine zinc powder.

Here, the reason for using a fine powder of a normally conductive metal with a melting point below the secondary sintering temperature is that the fine powder of a normally conductive metal fully reacts with the stabilizing metal during secondary sintering and becomes in close contact with the stabilizing metal. It is. For example, when copper is used as the stabilizing metal, when sintering the oxide ceramic superconductor powder together with the stabilizing copper in the atmosphere, the electrical resistance increases at the interface between the copper and the oxide ceramic superconductor. Large CuO is produced, increasing the interfacial electrical resistance. However, when the above-mentioned low melting point metal fine powder, such as zinc, is mixed with the oxide ceramic superconductor powder, the stabilized copper undergoes a diffusion reaction and substantially increases the interfacial surface area, making it possible to reduce the interfacial resistance. It is from.

The mixing ratio when obtaining the mixed powder of the superconducting powder and the normal conductive metal fine powder is such that the ratio of the superconducting powder to the normal conductive metal fine powder is 0.8:0.2 by volume. It is preferable that the amount of normal conductive metal fine powder is smaller.

The reason for this is that if the amount of the superconducting powder is small, it will not connect as a superconductor after secondary sintering.

In the present invention, the secondary sintered body is a mixture of the oxide ceramic superconductor obtained by sintering a mixed powder of the superconducting powder and the normal conductive metal fine powder, and the normal conductive metal having a low melting point. Refers to a sintered conductor.

When carrying out the secondary sintering, conditions are suitable that allow the oxide ceramic superconductor to be sintered and do not deteriorate the properties of the low-melting-point normal conductive metal, and the secondary sintering temperature is 850°C.
It is preferable to set it as -1100 degreeC.

The stabilizing metal body used in the present invention is a good conductor of electricity and heat, which bypasses the current locally generated in the normal conducting part of the oxide ceramic superconductor, and
By quickly diffusing locally generated heat and preventing its propagation through the normal conductive portion, and by reducing the magnetic diffusion coefficient of the system, the rate of penetration of magnetic flux is slowed down and heat generation is reduced. Any metal body may be used as long as it contains a normally conductive metal having a melting point higher than the secondary sintering temperature, but more preferably silver, silver alloy, copper (oxygen-free copper), copper alloy body,
These are a Cu/Fe-Ni composite metal body, a Cu-nonmagnetic high melting point metal composite metal body, and a copper composite metal body.

Crystallization using a metal body containing a high melting point metal whose melting point is higher than the secondary sintering temperature as the stabilizing metal body can prevent the stabilizing metal body from melting off during secondary sintering. It's for a reason. In particular, as the stabilizing metal body,
If a Cu/Fe-Ni composite metal body is used, the Fe-Ni alloy has a thermal expansion coefficient closer to that of an oxide ceramic superconductor than Cu alone, and has excellent thermal shock resistance before and after heat treatment for sintering. preferable.

The present invention will be explained in more detail below based on preferred embodiments shown in the accompanying drawings.

The oxide ceramic-based superconducting conductor according to the present invention has a ceramic-metal secondary structure made of the ceramic-based superconducting powder and the normal-conducting metal fine powder, as shown in FIGS. 1a to 4b. Although it may have any shape as long as it has the sintered body 1 and the stabilizing metal body 2, it is preferable to form it into a linear body or a tape (ribbon) body.

As shown in FIGS. 1a to 2b, the ceramic-metal sintered body 1 may be sheathed with a stabilizing metal body 2 to form a composite structure, or as shown in FIGS. 3a to 4b. As shown, a layered ceramic-metal secondary sintered body may be formed on the outer surface of the stabilized metal body 2 to form a composite.

In addition, as shown in FIG. 2a or 2b, the stabilizing metal body 2 is made of a metal such that the outer layer 22 is a metal having a melting point slightly higher than the secondary sintering temperature, such as silver or copper, and the inner layer 24 is made of a metal having a melting point slightly higher than the secondary sintering temperature. The cladding may be made of a non-magnetic high melting point metal having a high melting point.

Further, as shown in FIGS. 4a and 4b, the stabilizing metal body 2 is composed of a Cu/Fe-Ni alloy composite metal body in which a Fe-Ni alloy body 28 is combined with a pure copper body 26. Good too.

The cross-sectional shape of the oxide ceramic superconducting conductor according to the present invention is not limited, and may be circular as shown in FIG. 1a, FIG. 2a, FIG. 3a, and FIG. 4a;
Figure 2b.

As shown in Figures 3b and 4b, rectangular (ribo-shaped)
Alternatively, it can be made into a desired shape such as an irregular shape.

Further, as shown in FIGS. 5a and 5b, on the outer periphery of the hard metal body 3 of the core, a large number of single-shaped oxide ceramic superconducting conductors as shown in FIGS. 1a to 4b are arranged as strands. A multi-shaped oxide ceramic superconducting conductor layer 4 is formed, and the outer periphery is further coated with a stabilizing metal 2.
It may also be configured to be covered with a sheath. When a multi-shaped oxide ceramic superconducting conductor is used in this way, the stability of the superconducting state is further increased, and the critical current density Jc is further improved.

At this time, the cross-sectional shape of the multi-shaped oxide ceramic superconductor is not limited, and may be circular as shown in FIG. 5a, rectangular as shown in FIG. 5b, or irregularly shaped. It can have any desired shape.

The oxide ceramic superconducting conductor according to the present invention is basically constructed as described above, and the manufacturing method thereof will be explained in detail below.

A flowchart of an embodiment of the method for manufacturing an oxide ceramic superconductor of the present invention is shown in FIG.

The first step in the method for manufacturing an oxide ceramic superconductor of the present invention is to combine the above-mentioned superconducting powder, that is, the raw material powder of the oxide ceramic superconductor or the oxide ceramic superconductor powder, and the fine normal-conducting metal powder. This is a mixing process. The mixing method does not need to be particularly limited, but for example, after rotational mixing using an organic solvent as a medium,
A method of scattering the medium is preferred.

In this step, when the oxide ceramic superconductor powder is used as the superconducting powder, the raw material powder of the oxide ceramic superconductor is primarily sintered. The particle size of the raw material powder is preferably 2 to 5 μm. The reason for this is that the smaller the particle size, the more uniform the superconductor powder can be obtained. -Next sintering is 850~10 as mentioned above.
Preferably, it is carried out at 50° C. in an oxygen atmosphere.

Next, this primary sintered body is crushed. Although pulverization may be carried out by a conventional method, it is preferable to use a rotating mortar, for example. The particle size of the oxide ceramic superconductor powder is preferably 0.5 to 5 μm. This may be achieved by reducing the particle size, since the secondary sintering temperature can be lowered and the optimum conditions can be achieved.

When the raw material powder of the oxide ceramic superconductor is directly mixed with the normal conductive metal fine powder as the superconducting powder, the particle size of the raw material powder is preferably 1 to 4 μm. The reason for this is that when directly inserted, lower temperature sintering is required and refinement is required.

The second step is a step of compounding the mixed powder of the superconducting powder and the normal conductive metal fine powder with the stabilizing metal body.

The compounding step is performed by compacting the mixed powder into a pellet, incorporating (inserting) it into a tubular stabilizing metal body, reducing the area by swaging, and then forming a linear body by drawing, or This is a process of processing into a tape (ribbon) shaped body by rolling.

At this time, the mixed powder was compacted into a pellet shape having the same diameter as the tube, but the present invention is not limited to this. It may also be incorporated directly into the tubular stabilizing metal body without molding. The size of the fine powder compact is 100 μm ~
1mm is good.

The size of the tubular stabilizing metal body is not particularly limited, but for example, the inner diameter is 5 to 50 mm and the wall thickness is 0.5 to 5 mm.
This is a size that allows stable processing in the next process.

Further, any method may be used to process the tubular stabilized metal body incorporating the mixed powder into a linear body or tape (ribbon) body, but as described above, after reducing the area by swaging, drawing is performed. It is preferable to process the linear body into a tape (ribbon)-like body by rolling.

The wire diameter of the shaped body is preferably 0.2 to 5 mm, and the cross-sectional shape of the tape (ribbon) shaped body is preferably 2XO, 1 to TOXO, 5 mm. The reason for this is that if the size is thin or small, it is difficult to process, and if it is large, bending cannot be performed, and the orientation of the superconductor is insufficient, resulting in no properties.

The third step is a step of secondary sintering the linear composite or tape (ribbon)-shaped composite thus obtained to obtain a linear superconducting conductor or a tape (ribbon)-shaped superconducting conductor, respectively.

As mentioned above, the secondary sintering depends on the structure, but it is preferable to perform heat treatment in an oxygen atmosphere at 850 to 1100° C. for 30 minutes to 20 hours. This is because the superconducting powder in the linear or tape (ribbon) composite is transformed into an oxide ceramic superconductor having a layered perovskite structure by the secondary sintering heat treatment.

Next, another embodiment of the composite step will be described.

This compounding step involves dispersing and mixing the above-mentioned mixed powder of the superconducting powder and the normal-conducting metal fine powder in a solution or colloidal dispersion of an organic compound, and then applying the dispersed mixed solution to the stabilized metal body. This is the step of coating to obtain a composite.

The solution or colloidal dispersion of the organic compound may be of any kind as long as it can sufficiently disperse and mix the mixed powder and that itself is substantially eliminated by thermal decomposition during secondary sintering. Preferably, a solution of an organic polymer compound such as methacrylic acid or a solution thereof dissolved in an organic solvent such as toluene is used.

The dispersion mixture solution may be applied to the stabilized metal body by spraying, smearing, screen printing, etc., or by immersing the stabilized metal body in the dispersion mixture solution. Any method may be used as long as it forms a coating film of the dispersed mixed solution containing the mixed powder.

Here, the shape of the stabilizing metal body may be determined according to the shape of the oxide ceramic superconductor, and is not particularly limited, but in the case of a linear body, 9 is -
00 is 1. Preferably, the stabilizing metal body is also a linear body, the diameter of which is preferably 0.2 to 2 mm, and the thickness of the coating film thereon is preferably 10 μm to 1 mm. Further, in the case of a tape (ribbon) shaped body, it is preferable that the stabilizing metal body also uses a tape (ribbon) shaped body, and its cross-sectional shape is 2×
It is preferably 0.1 to 10×0.5 mm, and the thickness of the coating film thereon is preferably 10 μm to 0.1 mm.

The coating film may be formed all around the stabilizing metal body,
It may be formed only in part.

After the coating, any method may be used to dry the coating film, but natural drying is preferred.

The linear or tape (ribbon) composite thus obtained is subjected to secondary sintering in the third step described above.
At this time, the organic compound is thermally decomposed and disappears, so that a secondary sintered layer of the normal conductive metal and the oxide ceramic superconductor is formed on the surface of the stabilized metal body, and the oxide ceramic superconductor layer is formed on the surface of the stabilized metal body. A superconducting conductor is produced.

Although the oxide ceramic superconducting conductor and the manufacturing method thereof according to the present invention are constructed as described above, they are not limited thereto, and improvements and changes in design are possible without departing from the gist of the present invention. Of course.

<Example> The present invention will be specifically described below based on examples.

(Example 1) BaCO3, Y2O3, CuO powder (size 1 to 20
p mφ), Ba% Y, Cu molar ratio is about 0.6:
Weigh and mix the powder so that the ratio is 0.4:1, and heat it at 900℃.
Primary sintering was performed by heating in the air for 24 hours. This obtained primary sintered body of oxide ceramic superconductor is crushed,
It was made into powder (size 0.5 to 20 μmφ). to this,
Fine zinc powder having an average particle size of about 20 μm was mixed at a volume ratio of 10% to obtain a mixed powder of an oxide ceramic superconductor and zinc. This mixed powder was made into a mold with an outer diameter of 10 mm and a wall thickness of 2 mm.
After inserting the powder into an oxygen-free steel pipe, swaging and drawing were performed to obtain an outer diameter of 2 mm. Add this to 1 more
A secondary sintered body was obtained by heating at 000° C. for 30 minutes in an Ar atmosphere. The critical temperature (Tc) of the obtained oxide ceramic superconductor was approximately 90, the critical current density (Jc) was 850 A/cm2, and the interfacial resistance between the stabilized copper and the oxide ceramic superconductor was 10 mΩφCm2. in,
The interfacial resistance is approximately 100% compared to the one that does not contain fine zinc powder.
It was less than 1/10,000, and good electrical adhesion was maintained.

(Example 2) BaCOs, Y203, CuO powder (size 1 to
20 μmφ), and the molar ratio of Ba, Y, and Cu is approximately 0.6
: Weigh and mix the powder so that the ratio is 0.4:1, and add this to 900
℃ in the air for 24 hours to perform primary sintering. The obtained primary sintered oxide ceramic superconductor was ground into powder (size, 0.5 to 20 μm). This was mixed with zinc fine powder having an average particle size of about 20 μm at a volume ratio of about 10% to obtain a mixed powder of oxide ceramic superconductor and zinc. This mixed powder was added to a methacrylic acid stock solution and a toluene mixed solution at a weight percentage of 60%, 10%, and 3%, respectively.
A coating material uniformly mixed at a ratio of 0% was prepared, and this was applied to both sides of an oxygen-free copper wave with a thickness of 0.5 mm. After naturally drying this, it was heated in the air at 1000° C. for 30 minutes to obtain a secondary sintered body. The obtained oxide ceramic superconductor has a Tc of about 90 and a critical current (Jc) of 3O00.
The interfacial electrical resistance between the ceramic and the stabilized copper was approximately the same value as in Example 1, and good electrical adhesion was maintained.

<Effects of the Invention> As detailed above, according to the present invention, a secondary sintered body in which a normal conductive metal having a melting point lower than the secondary sintering temperature is mixed in an oxide ceramic superconductor; Since it is combined with a stabilizing metal body containing a normal conductive metal having a melting point higher than the secondary sintering temperature, the superconducting state is extremely well stabilized and the critical temperature (Tc) and critical current density ( J
In addition to providing a high oxide ceramic superconductor having c), the interfacial resistance between the stabilizing metal body and the oxide ceramic superconductor can be lowered, and good electrical adhesion can be maintained. Therefore, it is possible to provide an oxide ceramic superconducting conductor that does not burn out even if an excessive current flows and the superconducting state is broken.

Further, according to the present invention, a method for manufacturing an oxide ceramic superconducting conductor that can easily and easily convert the oxide ceramic superconducting conductor having the above-mentioned effects into a linear conductor or tape (ribbon) conductor. can be provided.

[Brief explanation of drawings]

Figures 1a, 2a, 3a and 4a show the oxides of the invention having a circular cross section; Figures 1b, 2b, 3b and 4b show the oxides of the invention having a rectangular cross section. FIG. 3 is a cross-sectional view of various embodiments of ceramic-based superconducting conductors. FIG. 5a is a cross-sectional view of one embodiment of the multi-shaped oxide ceramic superconducting conductor of the present invention having a circular cross section and FIG. 5b a rectangular cross section. FIG. 6 is a flow chart showing one embodiment of the method for manufacturing an oxide ceramic superconducting conductor of the present invention. Explanation of symbols 1... Ceramic-metal secondary sintered body, 2... Stabilizing metal body, 3... Hard metal body of core, 4... Oxide ceramic superconducting conductor aggregate, 22
-... Stabilized metal body outer layer, 24... Stabilized metal body layer, 26... Pure copper body, 2 B... Fe-Ni alloy body FIG, Ia
FIG, '1bFIG, 2a
FIG, 2bFI G, 3a FI
G, 3bFIG, 48 FIG, 5a FIG, 5b! 1b 6 figure

Claims (13)

[Claims] (1) A secondary sintered body of superconducting powder and normal conductive metal fine powder having a melting point below the secondary sintering temperature, and containing a normal conductive metal having a melting point above the secondary sintering temperature. An oxide ceramic superconducting conductor comprising a stabilizing metal body. (2) The oxide ceramic superconducting conductor according to claim 1, wherein the superconducting powder is a raw material powder of the oxide ceramic superconducting material before primary sintering. (3) The superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. The oxide ceramic superconducting conductor according to claim 1, which is a mixed powder containing one or more selected from the group consisting of compound powders. (4) The superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. The oxide ceramic system according to claim 1, which is an oxide ceramic system superconductor powder produced by pulverizing a mixed powder with one or more selected from the group consisting of system compound powders after primary sintering. superconducting conductor. (5) The secondary sintered body has a composition formula MM′_2Cu_3O_7-δ (where M is Y,
Sc, and La, Gd, Dy, Ho, Er, Yb, L
At least one member selected from the group consisting of lanthanides such as U and Eu, M' is at least one member selected from the group of alkaline earth metals, and δ represents deficient oxygen). An oxide ceramic superconducting conductor according to any one of claims 1 to 4. (6) A stabilized metal containing a mixed powder of a superconducting powder and a normal conductive metal fine powder having a melting point below the secondary sintering temperature, and a normal conductive metal having a melting point above the secondary sintering temperature. 1. A method for producing an oxide ceramic superconducting conductor, which comprises performing secondary sintering after compounding the oxide ceramic superconducting conductor. (7) The method for producing an oxide ceramic superconductor according to claim 6, wherein the superconducting powder is a raw material powder for the oxide ceramic superconductor before primary sintering. (8) The superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. 7. The method for producing an oxide ceramic superconducting conductor according to claim 6, which is a mixed powder containing one or more selected from the group consisting of compound powders. (9) The superconducting powder includes copper-oxygen compound powder, barium-oxygen compound powder and/or strontium-oxygen compound powder, yttrium-oxygen compound powder, lanthanum-oxygen compound powder, and scandium-oxygen compound powder. The oxide ceramic system according to claim 6, which is an oxide ceramic system superconductor powder produced by pulverizing a mixed powder with one or more selected from the group consisting of system compound powders after primary sintering. A method for manufacturing superconducting conductors. (10) The secondary sintered body has the composition formula MM′_2Cu_3O_7-δ (where M is Y,
Sc, and La, Gd, Dy, Ho, Er, Yb, L
At least one member selected from the group consisting of lanthanides such as U and Eu, M' is at least one member selected from the group of alkaline earth metals, and δ represents deficient oxygen). A method for producing an oxide ceramic superconducting conductor according to any one of claims 6 to 9. (11) Claims 6 to 10, wherein the compounding is performed by inserting the superconducting powder-metal mixed powder into the tubular stabilized metal body, compacting it, and forming it into a wire or tape. A method for producing an oxide ceramic superconducting conductor according to any one of the above. (12) The method for producing an oxide ceramic superconducting conductor according to claim 11, wherein the consolidation is performed by drawing by swaging, drawing, or rolling. (13) The above-mentioned compounding is performed by dispersing and mixing the superconducting powder-metal mixed powder in a solution or colloidal dispersion of an organic polymer compound that will substantially disappear by thermal decomposition, and then A method for producing an oxide ceramic-based superconducting conductor according to any one of claims 6 to 10, which comprises coating the oxide ceramic superconducting conductor.