JP6775652B1 - Manufacturing method of superconducting wire and superconducting wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconducting wire material and a method for manufacturing a superconducting wire material capable of performing a normal appearance inspection and discriminating between a front surface and a back surface of the superconducting wire material. A superconducting wire (10) is a tape-shaped superconducting wire having at least a tape-shaped base material (1) and a superconducting laminated body (5) having a superconducting layer (3) laminated on the base material (1). The superconducting wire member 10 is provided with a stabilizing layer 6 on the outer peripheral surface of the superconducting laminated body 5. The label 7 is formed on the surface to be formed, which is at least one of the first main surface 10a, which is the surface of the stabilizing layer 6 on the substrate 1 side, and the second main surface 10b opposite to the first main surface 10a. ing. The label 7 contains a fluorescent substance that emits light when irradiated with ultraviolet rays, and is capable of transmitting visible light. [Selection diagram] Fig. 1

Description

The present invention relates to a superconducting wire and a method for manufacturing a superconducting wire.

For example, the superconducting wire material described in Patent Document 1 includes a main body portion having a substrate and a superconducting layer, and a copper protective layer covering the main body portion. The superconducting wire has an identification mark formed on either the substrate side surface or the superconducting layer side surface. The superconducting wire can distinguish between the surface on the substrate side and the surface on the superconducting layer side (that is, distinguish between the front surface and the back surface) by the identification mark.

Japanese Patent No. 5027895

Superconducting wires may be visually inspected. In the visual inspection, the appearance of the superconducting wire is checked for abnormalities by camera or visual inspection.
In the above-mentioned superconducting wire, the identification mark may be erroneously determined as an abnormal appearance in the appearance inspection. In the above-mentioned superconducting wire, it may be difficult to detect abnormal parts such as scratches and discoloration due to the identification mark.

One aspect of the present invention is an object of the present invention to provide a method for manufacturing a superconducting wire material and a superconducting wire material, which can normally perform a visual inspection and can accurately distinguish between a front surface and a back surface of the superconducting wire material. To do.

One aspect of the present invention is a tape-shaped superconducting wire having at least a tape-shaped base material and a superconducting layer having a superconducting layer laminated on the base material, and is formed on the outer peripheral surface of the superconducting laminated body. A stabilizing layer is provided, and a surface to be formed, which is at least one of a first main surface, which is a surface of the stabilizing layer on the substrate side, and a second main surface opposite to the first main surface, A superconducting wire is provided in which a label is formed, the label contains a fluorescent substance that emits light when irradiated with ultraviolet rays, and visible light can be transmitted.

It is preferable that the sign is formed only on the first main surface of the first main surface and the second main surface.

It is preferable that an insulating layer made of an insulating material is provided on the stabilizing layer and the outer peripheral surface of the label.

The label is preferably colorless.

Another aspect of the present invention is a tape-shaped superconducting wire material provided with a superconducting laminate having at least a tape-shaped base material and a superconducting layer laminated on the base material, on the outer peripheral surface of the superconducting laminate. , A metal protective layer is provided,
A stabilizing layer is provided on the outer peripheral surface of the metal protective layer, and an insulating layer made of an insulating material is provided on the outer peripheral surface of the stabilizing layer, which is a surface of the insulating layer on the base material side. A label is formed on the surface to be formed, which is at least one of the first main surface and the second main surface opposite to the first main surface, and the label contains a fluorescent substance that emits light when irradiated with ultraviolet rays, and Provided is a superconducting wire material capable of transmitting visible light.

The insulating layer is preferably formed by wrapping an insulating tape made of the insulating material.

Yet another aspect of the present invention is a step of producing a superconducting wire main part having a superconducting laminate having at least a tape-shaped base material and a superconducting layer laminated on the base material, and a step of producing the superconducting wire main part. It has a step of forming a label on a surface to be formed, which is at least one of a first main surface which is a surface on the base material side and a second main surface opposite to the first main surface. The label provides a method for producing a superconducting wire, which contains a fluorescent substance that emits light when irradiated with ultraviolet rays and is capable of transmitting visible light.

The method for producing a superconducting wire may further include a step of inspecting the appearance of the oxide superconducting wire.

According to one aspect of the present invention, it is possible to provide a method for manufacturing a superconducting wire material and a superconducting wire material, which can normally perform a visual inspection and can accurately distinguish between a front surface and a back surface of the superconducting wire material. it can.

It is a perspective view which looked at the oxide superconducting wire of 1st Embodiment from one side. It is a perspective view which looked at the oxide superconducting wire of FIG. 1 from the other side. It is a schematic diagram which shows an example of the apparatus which forms a sign. It is a schematic diagram which shows an example of the appearance inspection apparatus. It is a perspective view which looked at the oxide superconducting wire of the 2nd Embodiment from one side. It is a perspective view which looked at the oxide superconducting wire of the previous figure from the other side. It is a perspective view which looked at the oxide superconducting wire of the 3rd Embodiment from one side. (A) It is a top view of the oxide superconducting wire of the 4th embodiment seen from the 2nd main surface side. (B) is a plan view of the oxide superconducting wire of (A) seen from the first main surface side. (A) is a plan view of the oxide superconducting wire of the fifth embodiment as viewed from the second main surface side. (B) is a plan view of the oxide superconducting wire of (A) seen from the first main surface side.

Hereinafter, the present invention will be described with reference to the drawings based on the preferred embodiments.

[Oxide superconducting wire] (1st embodiment)
FIG. 1 is a perspective view of the oxide superconducting wire 10 as viewed from one side. FIG. 2 is a perspective view of the oxide superconducting wire 10 as viewed from the other side.

As shown in FIGS. 1 and 2, the oxide superconducting wire 10 includes a superconducting laminate 5, a stabilizing layer 6, and a label 7. The oxide superconducting wire 10 is a specific example of the “superconducting wire”. The oxide superconducting wire 10 is formed in a tape shape.

The superconducting laminate 5 has a structure in which an oxide superconducting layer 3 and a protective layer 4 are formed on a base material 1 via an intermediate layer 2. Specifically, the superconducting laminate 5 has a structure in which the intermediate layer 2, the oxide superconducting layer 3, and the protective layer 4 are laminated in this order on one surface of the tape-shaped base material 1.

The X direction is the width direction of the oxide superconducting wire 10. The Y direction is the length direction of the oxide superconducting wire 10, and is a direction orthogonal to the X direction. The Z direction is the thickness direction of the oxide superconducting wire 10, and is the direction in which the base material 1, the intermediate layer 2, the oxide superconducting layer 3, the protective layer 4, and the like are laminated. The Z direction is a direction orthogonal to the X direction and the Y direction. The XZ cross section is a cross section defined by the X direction and the Z direction.

The base material 1 is in the form of a tape and is made of a metal such as Hastelloy (registered trademark).
The intermediate layer 2 includes, for example, a diffusion prevention layer, a bed layer, an alignment layer, a cap layer, and the like from the base material 1 side. The diffusion prevention layer has a function of suppressing a part of the components of the base material 1 from diffusing and being mixed as impurities on the oxide superconducting layer 3 side. The bed layer reduces the reaction at the interface between the base material 1 and the oxide superconducting layer 3 and improves the orientation of the layer formed on the bed layer. The orientation layer controls the crystal orientation of the cap layer. The cap layer is made of a material in which the crystal grains can be self-oriented in the in-plane direction.

The oxide superconducting layer 3 is composed of an oxide superconductor. As an oxide superconductor, particularly, but not limited to, for example, the general formula _{REBa 2 Cu 3 O X (RE123} ) with REBa-Cu-O based oxide superconductor represented the like. Examples of the rare earth element RE include one or more of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

The protective layer 4 (metal protective layer) has functions such as bypassing an overcurrent generated at the time of an accident and suppressing a chemical reaction occurring between the oxide superconducting layer 3 and the layer provided on the protective layer 4. Have. Examples of the material of the protective layer 4 include silver (Ag), copper (Cu), gold (Au), an alloy of gold and silver, and other metals such as silver alloys, copper alloys, and gold alloys.

Known techniques can be applied to the base material 1, the intermediate layer 2, the oxide superconducting layer 3 and the protective layer 4.
The base material 1, the intermediate layer 2, and the oxide superconducting layer 3 may be used as a "superconducting laminate". In that case, it can be said that the protective layer 4 is provided on the outer peripheral surface of the superconducting laminate.

The stabilizing layer 6 is provided on the outer peripheral surface of the superconducting laminated body 5. The stabilizing layer 6 is provided so as to cover the entire outer peripheral surface 5a of the superconducting laminated body 5. The stabilizing layer 6 has a function as a bypass portion for commutating an overcurrent generated when the oxide superconducting layer 3 is transferred to the normal conducting state. Examples of the constituent material of the stabilizing layer 6 include metals such as copper, copper alloys (for example, Cu-Zn alloys, Cu-Ni alloys, etc.), aluminum, aluminum alloys, and silver. The stabilizing layer 6 can be formed by plating (for example, electrolytic plating).

The XZ cross section of the oxide superconducting wire 10 is, for example, rectangular. Of the surfaces of the oxide superconducting wire 10 (specifically, the surface of the stabilizing layer 6), the surfaces along the X and Y directions are referred to as "main surfaces". Of the two main surfaces of the oxide superconducting wire 10, the main surface (lower surface in FIG. 1) on the base material 1 side is referred to as "first main surface 10a". Of the two main surfaces of the oxide superconducting wire 10, the surface opposite to the first main surface 10a (upper surface in FIG. 1) is referred to as "second main surface 10b". One of the first main surface 10a and the second main surface 10b is the front surface of the oxide superconducting wire 10, and the other is the back surface of the oxide superconducting wire 10. Reference numeral 10c is a side surface of the oxide superconducting wire 10.
The width of the oxide superconducting wire 10 (dimension in the X direction) is larger than the thickness of the oxide superconducting wire 10 (dimension in the Z direction).

A marker 7 is formed on the first main surface 10a (surface to be formed). The marker 7 is formed only on the first main surface 10a of the two main surfaces (first main surface 10a and second main surface 10b).
The label 7 is formed in a layered manner over the entire region of the first main surface 10a, for example. The label 7 is continuously formed in the length direction of the oxide superconducting wire 10. The label 7 is formed over the entire length of the oxide superconducting wire, for example.

The sign 7 is transparent. Therefore, the label 7 can transmit visible light in the thickness direction. Visible light emitted toward the oxide superconducting wire 10 passes through the label 7 and reaches the first main surface 10a. The light reflected by the first main surface 10a passes through the marker 7 and is emitted. Therefore, the appearance inspection described later is also possible for the first main surface 10a of the oxide superconducting wire 10.

Transparency means that visible light can be transmitted. The transmittance of visible light (for example, wavelength 380 to 750 nm) in the thickness direction of the label 7 is preferably 50% or more in the entire wavelength range of visible light. The visible light transmittance can be measured by, for example, a spectrophotometer (JASCO Corporation, spectrophotometer V-670).

The label 7 is preferably colorless. Colorless means, for example, that the absolute values of a ^* and b ^* are 15 or less in the CIE 1976 L ^* a ^* b ^* color system (based on JIS Z8729 (2004)). Colorless may be defined as a ratio of maximum absorbance to minimum absorbance (maximum absorbance / minimum absorbance) in the wavelength range of visible light (wavelength 380 to 750 nm) of 1.0 or more and 2.0 or less.

Label 7 contains, for example, a fluorescent substance. As the fluorescent substance, for example, stilbene-based, coumarin-based, pyrazoline-based, naphthalimide-based, benzoxazole-based, imidal-based, thiazole-based, and distyrylbiphenyl-based organic fluorescent substances can be used. The fluorescent substance _may be used an inorganic fluorescent substance such as ZnSiO 4, MgWO _4. The blending amount of the fluorescent substance in the label 7 may be, for example, 0.0001 to 1% by mass. When the fluorescent substance is irradiated with ultraviolet rays (for example, a wavelength of 200 nm or more and less than 380 nm), the fluorescent substance absorbs the ultraviolet rays and emits visible light.

The label 7 may be, for example, a coating film formed by a fluorescent paint containing a fluorescent substance. The fluorescent coating material contains, for example, a fluorescent substance and a base resin. Examples of the base resin include acrylic resins, ultraviolet curable resins, polyurethane resins, silicon resins, epoxy resins and the like.
The label may be formed not in the entire region of the first main surface of the oxide superconducting wire but in a partial region.

[Manufacturing method of oxide superconducting wire]
Next, an example of a method for manufacturing the oxide superconducting wire 10 will be described.

(Making the main part of the superconducting wire)
The oxide superconducting wire 10 before the label 7 is formed is referred to as "superconducting wire main part 10A" (see FIGS. 1 to 3). The superconducting wire main body 10A includes a superconducting laminate 5 and a stabilizing layer 6. The superconducting wire main portion 10A is obtained by forming a stabilizing layer 6 on the outer peripheral surface of the superconducting laminated body 5 by plating or the like.

(Formation of sign)
FIG. 3 is a schematic view showing an example of an apparatus for forming the label 7. The label forming apparatus shown in FIG. 3 includes a roller 11 for supplying a fluorescent paint containing a fluorescent substance. In order to form the label 7 on the main portion 10A of the superconducting wire, the following method can be taken.
The first main surface 10a of the superconducting wire main portion 10A is brought into contact with the roller 11, and the superconducting wire main portion 10A is driven in the length direction (see the arrow in FIG. 3) while rotating the roller 11. The label 7 is formed by applying the fluorescent paint supplied to the roller 11 to the first main surface 10a. As a result, the oxide superconducting wire 10 shown in FIGS. 1 and 2 is obtained.

(Visual inspection)
In the oxide superconducting wire material, a large external force is applied to the outer surface (for example, the first main surface) in the manufacturing process, and damage (for example, local defect) may occur. In addition, the oxide superconducting wire may be discolored due to denaturation of a part of the region due to chemical action, or foreign matter may adhere to it. Therefore, the appearance of the oxide superconducting wire can be inspected.

FIG. 4 is a schematic view showing an example of the visual inspection apparatus. The visual inspection apparatus shown in FIG. 4 includes a light source 12, an imaging unit 13, and a control unit 14. The light source 12 emits visible light, for example. As the imaging unit 13, for example, CMOS (Complementary Metal Oxide Semiconductor), CCD (Charge Coupled Device), or the like is suitable.

In order to inspect the appearance of the oxide superconducting wire 10, the surface of the oxide superconducting wire 10 is imaged by the imaging unit 13 while the oxide superconducting wire 10 is running in the length direction. The imaging unit 13 transmits an image to the control unit 14. The control unit 14 determines the presence or absence of an abnormal portion in the oxide superconducting wire 10 based on the obtained image. For example, if the first main surface 10a has a region having a different color from the other regions, it can be recognized as an abnormal portion. The visual inspection may be performed visually.

In the oxide superconducting wire material 10, the label 7 is formed on the first main surface 10a, but since the label 7 is transparent, the visible light emitted toward the first main surface 10a passes through the label 7. It reaches the first main surface 10a. The light reflected by the first main surface 10a passes through the marker 7 and is emitted. Therefore, the oxide superconducting wire 10 can be visually inspected on the first main surface 10a.

[Discrimination between front surface and back surface of oxide superconducting wire]
The position of the label 7 of the oxide superconducting wire 10 is different depending on whether it is viewed from the first main surface 10a side (see FIG. 2) or from the second main surface 10b side (see FIG. 1). Specifically, as shown in FIG. 2, when the oxide superconducting wire 10 is viewed from the first main surface 10a side, the label 7 is located on the front surface side of the oxide superconducting wire 10. As shown in FIG. 1, when the oxide superconducting wire 10 is viewed from the second main surface 10b side, the label 7 is located on the back surface side of the oxide superconducting wire 10. As described above, the position of the sign 7 of the oxide superconducting wire 10 differs depending on the front and back postures.

An ultraviolet irradiation device is used to distinguish between the front surface and the back surface of the oxide superconducting wire 10. The ultraviolet irradiation device includes, for example, an ultraviolet source such as an ultraviolet lamp (metal halide lamp) or an ultraviolet LED.
When ultraviolet rays are irradiated using an ultraviolet source with the surface of the oxide superconducting wire 10 on the first main surface 10a side as the irradiated surface (see FIG. 2), the ultraviolet rays are applied to the label 7. The fluorescent substance contained in the label 7 absorbs the ultraviolet rays and emits visible light. On the other hand, since the second main surface 10b is not labeled, no light emission occurs even if the second main surface 10b of the oxide superconducting wire 10 is irradiated with ultraviolet rays (see FIG. 1).
The presence or absence of light emission of the label 7 may be visually confirmed, or may be confirmed by using a light receiving element such as a photodiode.

[Effects of oxide superconducting wire]
Since the oxide superconducting wire 10 has a label 7 containing a fluorescent substance formed on the first main surface 10a, the front and back postures can be accurately adjusted by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. It is easy to distinguish. Specifically, when the light emission of the label 7 can be confirmed, it can be seen that the oxide superconducting wire 10 is in a posture in which the surface on the first main surface 10a side is the irradiated surface (see FIG. 2). When the light emission of the label 7 cannot be confirmed, it is known that the oxide superconducting wire 10 is in a posture in which the second main surface 10b is the irradiated surface (see FIG. 1). Therefore, in the oxide superconducting wire material 10, the front surface and the back surface can be discriminated.

The oxide superconducting wire 10 can be confirmed by visual inspection for the presence or absence of abnormal parts such as the damage. In the oxide superconducting wire 10, since the label 7 is transparent (that is, visible light can be transmitted), the visible light passes through the label 7 and reaches the first main surface 10a, and the reflected light passes through the label 7. And exit. Therefore, the oxide superconducting wire 10 can normally perform an appearance inspection on the first main surface 10a as well.

When the oxide superconducting wire is connected to another oxide superconducting wire (not shown) or an electrode, it is preferable to use the surface on the oxide superconducting layer side as the connecting surface in order to reduce the connection resistance.
In the oxide superconducting wire material 10, since the label 7 is formed only on the first main surface 10a of the two main surfaces (first main surface 10a and second main surface 10b), electricity on the second main surface 10b The resistance can be kept low. Therefore, when the oxide superconducting wire 10 is connected to another oxide superconducting wire (not shown) or an electrode, the connection resistance can be lowered.

[Effects of the manufacturing method of oxide superconducting wire]
In the method for producing the oxide superconducting wire, since the label 7 containing a fluorescent substance is formed, the oxide superconducting wire 10 can determine the front and back postures by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. can get. Since the label 7 is capable of transmitting visible light, the appearance inspection of the oxide superconducting wire 10 can be normally performed.

[Oxide superconducting wire] (second embodiment)
FIG. 5 is a perspective view of the oxide superconducting wire 110 of the second embodiment as viewed from one side. FIG. 6 is a perspective view of the oxide superconducting wire 110 as viewed from the other side. The above-mentioned configurations are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 5 and 6, the oxide superconducting wire 110 includes a superconducting laminate 5, a stabilizing layer 6, an insulating layer 8, and a label 107. The oxide superconducting wire 110 is different from the oxide superconducting wire 10 shown in FIGS. 1 and 2 in that the insulating layer 8 is provided.

The insulating layer 8 is provided on the outer peripheral surface of the stabilizing layer 6. The insulating layer 8 is made of an insulating material (for example, an insulating resin). Examples of the insulating resin include polyimide, fluororesin, polyamide, polyamideimide, polyurethane, polyester, polyvinyl butyral, and polyvinyl formal.

The insulating layer 8 is formed by, for example, winding an insulating tape made of the insulating material around the outer peripheral surface of the stabilizing layer 6. Examples of the winding form of the insulating tape include wrap winding and butt winding. Wrap winding is a winding method in which the regions including the side edges of the tape are wound so as to overlap each other. Wrap winding has an advantage that high insulation performance (dielectric strength) can be ensured in the insulating layer 8.

Of the two main surfaces of the surface of the oxide superconducting wire 110 (specifically, the surface of the insulating layer 8), the main surface (lower surface in FIG. 5) on the base material 1 side is referred to as "first main surface 110a". Of the two main surfaces of the oxide superconducting wire 110, the surface opposite to the first main surface 110a (upper surface in FIG. 5) is referred to as "second main surface 110b". One of the first main surface 110a and the second main surface 110b is the front surface of the oxide superconducting wire 110, and the other is the back surface of the oxide superconducting wire 110.

The label 107 is formed only on the first main surface 110a of the two main surfaces (first main surface 110a and second main surface 110b). The label 107 has the same configuration as the label 7 in the oxide superconducting wire 10 shown in FIGS. 1 and 2 except that the label 107 is formed on the surface of the insulating layer 8. That is, the label 107 contains a fluorescent substance and is transparent.

[Manufacturing method of oxide superconducting wire]
(Making the main part of the superconducting wire)
A stabilizing layer 6 is formed on the outer peripheral surface of the superconducting laminate 5 by plating or the like. The insulating layer 8 is formed by wrapping an insulating tape around the outer peripheral surface of the stabilizing layer 6. As a result, the superconducting wire main part 110A is obtained.

(Formation of sign)
The label 107 is formed by applying the fluorescent paint to the first main surface 110a by the label forming apparatus (see FIG. 3). As a result, the oxide superconducting wire 110 (see FIGS. 5 and 6) is obtained.

(Visual inspection)
The surface of the oxide superconducting wire 110 is imaged by a visual inspection device (see FIG. 4), and the presence or absence of an abnormal portion in the oxide superconducting wire 110 is confirmed based on the obtained image.

[Effects of oxide superconducting wire]
Since the oxide superconducting wire 110 has a label 107 containing a fluorescent substance formed on the first main surface 110a, the front and back postures can be accurately checked by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. It is easy to distinguish. Since the label 107 of the oxide superconducting wire 110 is transparent, the appearance inspection of the first main surface 110a can be normally performed.

Since the oxide superconducting wire 110 is provided with the insulating layer 8, it is excellent in terms of insulating characteristics.

[Oxide superconducting wire] (3rd embodiment)
FIG. 7 is a perspective view of the oxide superconducting wire 210 of the third embodiment as viewed from one side. The above-mentioned configurations are designated by the same reference numerals and the description thereof will be omitted.
As shown in FIG. 7, the oxide superconducting wire 210 includes a superconducting laminate 5, a stabilizing layer 6, a label 7, and an insulating layer 208. The oxide superconducting wire 210 is different from the oxide superconducting wire 110 shown in FIGS. 5 and 6 in that the label 7 is provided between the stabilizing layer 6 and the insulating layer 208.
The insulating layer 208 may be transparent (ie, transparent to visible light). In that case, the light emitted from the label 7 when the oxide superconducting wire 210 is irradiated with ultraviolet rays can be visually recognized.

[Manufacturing method of oxide superconducting wire]
(Making the main part of the superconducting wire)
By forming the stabilizing layer 6 on the outer peripheral surface of the superconducting laminate 5 by plating or the like, the superconducting wire main portion 10A is obtained.

(Formation of sign)
The label 7 is formed by applying a fluorescent paint to the first main surface 10a of the oxide superconducting wire by a label forming apparatus (see FIG. 3). As a result, a laminated structure 209 having a superconducting wire main part 10A and a label 7 is obtained.

(Visual inspection)
The surface of the laminated structure 209 is imaged by a visual inspection device (see FIG. 4), and the presence or absence of an abnormal portion is confirmed based on the obtained image.

Next, the insulating layer 208 is formed by wrapping the insulating tape around the laminated structure 209. As a result, the oxide superconducting wire 210 (see FIG. 7) is obtained.

[Effects of oxide superconducting wire]
Since the oxide superconducting wire 210 has a label 7 containing a fluorescent substance formed on the first main surface 10a, the front and back postures can be accurately adjusted by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. It is easy to distinguish. Since the label 7 of the oxide superconducting wire 210 is transparent, the appearance inspection of the first main surface 10a can be normally performed.

In the oxide superconducting wire 210, since the label 7 is provided between the stabilizing layer 6 and the insulating layer 208, the label 7 is less likely to be damaged when an external force is applied.

[Oxide superconducting wire] (4th embodiment)
FIG. 8A is a plan view of the oxide superconducting wire 410 of the fourth embodiment as viewed from the second main surface 10b side. FIG. 8B is a plan view of the oxide superconducting wire 410 viewed from the first main surface 10a side.
As shown in FIGS. 8 (A) and 8 (B), the oxide superconducting wire 410 has a label 407 formed on the first main surface 10a instead of the label 7. It is different from the oxide superconducting wire 10 shown in.

As shown in FIG. 8B, the label 407 has the same configuration as the label 7 shown in FIGS. 1 and 2 except that the label 407 is formed intermittently in the length direction of the oxide superconducting wire 410. To. The label 407 is formed not in the entire region of the first main surface 10a but in a partial region. The region of the first main surface 10a where the label 407 is not formed is referred to as a non-formed region.

[Effects of oxide superconducting wire]
Since the oxide superconducting wire 410 has a label 407 containing a fluorescent substance formed on the first main surface 10a, the front and back postures can be accurately adjusted by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. It is easy to distinguish. Since the label 407 of the oxide superconducting wire 410 is transparent, the appearance inspection can be normally performed on the first main surface 10a as well.

Since the label 407 is intermittently formed in the oxide superconducting wire material 410, the label 407 can be easily visually recognized by the contrast between the label 407 and the non-formed region at the time of light emission.

[Oxide superconducting wire] (5th embodiment)
FIG. 9A is a plan view of the oxide superconducting wire 510 of the fifth embodiment as viewed from the second main surface 10b side. FIG. 9B is a plan view of the oxide superconducting wire 510 as viewed from the first main surface 10a side.
As shown in FIGS. 9 (A) and 9 (B), the oxide superconducting wire 510 has a label 507 formed on the first main surface 10a instead of the label 7. It is different from the oxide superconducting wire 10 shown in.

As shown in FIG. 9B, the sign 507 has a shape in the shape of a character. The sign 507 is, for example, shaped like a number. The sign 507 functions as an identification code representing predetermined information. Examples of the information represented by the label 507 include product information regarding the oxide superconducting wire 510, such as lot information.

[Effects of oxide superconducting wire]
Since the oxide superconducting wire 510 has a label 507 containing a fluorescent substance formed on the first main surface 10a, the front and back postures can be accurately checked by checking the presence or absence of light emission when one surface is irradiated with ultraviolet rays. It is easy to distinguish. Since the label 507 of the oxide superconducting wire 510 is transparent, the appearance inspection can be normally performed on the first main surface 10a as well.

Since the oxide superconducting wire 510 includes a label 507 that functions as an identification code, it is possible to not only determine the front and back postures but also obtain information about the oxide superconducting wire 510 by irradiating with ultraviolet rays.

Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the method of forming the label is not particularly limited. As a method for forming the sign, marking may be adopted in which the fluorescent paint is attached to the oxide superconducting wire using a pen. It is also possible to attach the fluorescent paint to the oxide superconducting wire by spraying. In addition, as a method for forming a sign, a printing method, for example, a method of adhering a fluorescent paint to an oxide superconducting wire using an inkjet printer may be adopted.

The label may be formed on at least one of the first main surface and the second main surface of the oxide superconducting wire. The label may be formed on both the first main surface and the second main surface of the oxide superconducting wire. In this case, the first marker formed on the first main surface and the second marker formed on the second main surface can be distinguished from each other. In order to make the first sign and the second sign distinguishable, for example, the following configuration can be adopted. (1) The plan view shapes of the first sign and the second sign are different. (2) The amount of light emitted differs from that of the first label and the second label when irradiated with ultraviolet rays. (3) Since the fluorescent substance of the first label and the fluorescent substance of the second label are different, the colors of the light emitted by the first label and the second label are different.

1 ... Base material, 3 ... Oxide superconducting layer, 4 ... Protective layer (metal protective layer), 5,305 ... Superconducting laminate, 6 ... Stabilizing layer, 7,107,307,407,507 ... Label, 8, 208 ... Insulation layer, 10,110,210,310,410,510 ... Oxide superconducting wire (superconducting wire), 10a, 110a, 310a ... First main surface, 10b, 110b, 310b ... Second main surface, 10A ... Main part of superconducting wire.

Claims (8)

A tape-shaped superconducting wire having at least a tape-shaped base material and a superconducting laminate having a superconducting layer laminated on the base material.
A stabilizing layer is provided on the outer peripheral surface of the superconducting laminate.
A label is formed on a surface to be formed, which is at least one of a first main surface of the stabilizing layer, which is a surface on the substrate side, and a second main surface opposite to the first main surface.
The label is a superconducting wire material containing a fluorescent substance that emits light when irradiated with ultraviolet rays and capable of transmitting visible light. The superconducting wire material according to claim 1, wherein the sign is formed only on the first main surface of the first main surface and the second main surface. The superconducting wire material according to claim 1 or 2, wherein an insulating layer made of an insulating material is provided on the stabilizing layer and the outer peripheral surface of the label. The superconducting wire according to any one of claims 1 to 3, wherein the label is colorless. A tape-shaped superconducting wire having at least a tape-shaped base material and a superconducting laminate having a superconducting layer laminated on the base material.
A metal protective layer is provided on the outer peripheral surface of the superconducting laminate.
A stabilizing layer is provided on the outer peripheral surface of the metal protective layer.
An insulating layer made of an insulating material is provided on the outer peripheral surface of the stabilizing layer.
A label is formed on a surface to be formed, which is at least one of a first main surface of the insulating layer, which is a surface on the substrate side, and a second main surface opposite to the first main surface.
The label is a superconducting wire material containing a fluorescent substance that emits light when irradiated with ultraviolet rays and capable of transmitting visible light. The superconducting wire material according to claim 3 or 5, wherein the insulating layer is formed by winding an insulating tape made of the insulating material. A step of producing a superconducting wire main part having a superconducting laminate having at least a tape-shaped base material and a superconducting layer laminated on the base material.
A step of forming a label on a surface to be formed, which is at least one of a first main surface, which is a surface of the superconducting wire main portion on the base material side, and a second main surface opposite to the first main surface. Have,
The label is a method for producing a superconducting wire, which contains a fluorescent substance that emits light when irradiated with ultraviolet rays and is capable of transmitting visible light. The method for producing a superconducting wire according to claim 7, further comprising a step of inspecting the appearance of the superconducting wire.

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