Super-conducting wire, super-conducting coil, and magnetic resonance imaging device

Patent metadata

Field	Value
Publication number	US-10424428-B2
Application number	US-201515310802-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Jun 18, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

An object is to provide a super-conducting coil and a magnetic resonance imaging device that are quench-free by reducing Joule heat generated upon occurrence of separation of members even in a high magnetic field. The super-conducting coil in accordance with the present invention includes a spool and a super-conducting wire wound around the spool. The coil further includes, between the spool and the super-conducting wire, a first resin layer containing thermoplastic resin, a second resin layer containing thermosetting resin, and a mixed layer, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.

First claim

The invention claimed is:

1. A super-conducting coil comprising a spool and a super-conducting wire wound around the spool, wherein the coil further comprises, between the spool and the super-conducting wire, a first resin layer containing thermoplastic resin, wherein the first resin layer surrounds an outer periphery of the super-conducting wire, a second resin layer containing thermosetting resin, wherein the second resin layer is disposed on a curved surface portion of an inner peripheral surface of the super-conducting coil, and a mixed layer, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.

2. The super-conducting coil according to claim 1 , wherein a thickness of the mixed layer is greater than or equal to 10 nm.

3. The super-conducting coil according to claim 1 , wherein a thickness of the mixed layer is greater than or equal to 30 nm.

4. The super-conducting coil according to claim 1 , wherein a thickness of the mixed layer is greater than or equal to 100 nm.

5. The super-conducting coil according to claim 1 , wherein
the thermoplastic resin is phenoxy, and
a thickness of the mixed layer is greater than or equal to 10 nm.

6. The super-conducting coil according to claim 1 , wherein
the thermoplastic resin is phenoxy, and
a thickness of the mixed layer is greater than or equal to 20 nm.

7. The super-conducting coil according to claim 1 , wherein
the thermoplastic resin is phenoxy, and
a thickness of the mixed layer is greater than or equal to 50 nm.

8. The super-conducting coil according to claim 1 , wherein
the thermoplastic resin is nylon, and
a thickness of the mixed layer is greater than or equal to 25 nm.

9. The super-conducting coil according to claim 1 , wherein
the thermoplastic resin is nylon, and
a thickness of the mixed layer is greater than or equal to 100 nm.

10. The super-conducting coil according to claim 1 , wherein the first resin layer has a self-fusing property.

11. The super-conducting coil according to claim 1 , wherein the second resin layer is a prepreg sheet.

12. The super-conducting coil according to claim 1 , further comprising an insulating coating disposed upon the super-conducting wire and an insulating plate disposed between the spool and the super-conducting wire, wherein the super-conducting wire, the insulating coating, the first resin layer, the mixed layer, the second resin layer, the insulating plate, and the spool are sequentially formed in this order.

13. A magnetic resonance imaging device comprising:
the super-conducting coil according to claim 1 ;
a bed on which a test subject is laid;
a transporter configured to transport the test subject laid on the bed to an imaging region; and
an analyzer configured to analyze a nuclear magnetic resonance signal from the test subject transported to the imaging region by the transporter.

14. A method for producing a super-conducting coil including a spool and a super-conducting wire wound around the spool, the method comprising the steps of, between the spool and the super-conducting wire, forming a first resin layer containing thermoplastic resin, wherein the first resin layer surrounds an outer periphery of the super-conducting wire, forming a second resin layer containing thermosetting resin, wherein the second resin layer is disposed on a curved surface portion of an inner peripheral surface of the super-conducting coil, and forming a mixed layer, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.

15. The method for producing a super-conducting coil according to claim 14 , wherein a thickness of the mixed layer is greater than or equal to 10 nm.

16. The method for producing a super-conducting coil according to claim 14 , further comprising a step of applying a pressure of 0.2 to 0.5 MPa between the first resin layer and the second resin layer in the step of forming the mixed layer.

17. A super-conducting wire comprising a metal tube and a superconductor housed in the metal tube, wherein the super-conducting wire further comprises, on a surface of the metal tube, a first resin layer containing thermoplastic resin, wherein the first resin layer surrounds an outer periphery of the super-conducting wire, a second resin layer containing thermosetting resin, and a mixed layer, wherein the second resin layer is disposed on a curved surface portion of an inner peripheral surface of the super-conducting coil, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.

Assignees

• Hitachi Ltd

Inventors

• Kawasaki Masahiro
• Okishiro Kenji
• Arai Tadashi
• MIYAZOE Akihisa

Classifications

• H01F5/02

  wound on non-magnetic supports, e.g. formers · CPC title

• G01R33/3806

  Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets · CPC title

• H01F5/06

  Insulation of windings · CPC title

• H01F41/048

  Superconductive coils · CPC title

• G01R33/3815

  with superconducting coils, e.g. power supply therefor · CPC title