JP2821772B2 - Superconducting magnetic shield material - Google Patents
Superconducting magnetic shield materialInfo
- Publication number
- JP2821772B2 JP2821772B2 JP1204514A JP20451489A JP2821772B2 JP 2821772 B2 JP2821772 B2 JP 2821772B2 JP 1204514 A JP1204514 A JP 1204514A JP 20451489 A JP20451489 A JP 20451489A JP 2821772 B2 JP2821772 B2 JP 2821772B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- superconducting
- oxide
- thin plate
- magnetic shield
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、酸化物超電導材料を利用した磁気シールド
材に関し、特に磁気共鳴断層撮影装置（MRI）、リニア
モーターカー、超電導マグネット等磁場を発生する機器
中で好都合に利用することのできる磁気シールド材に関
する。Description: TECHNICAL FIELD The present invention relates to a magnetic shield material using an oxide superconducting material, and in particular, generates a magnetic field such as a magnetic resonance tomography apparatus (MRI), a linear motor car, and a superconducting magnet. The present invention relates to a magnetic shielding material that can be conveniently used in a device that performs the above.
［従来技術］ 従来、酸化物超電導材料を用いた磁気シールド材は、
酸化物超電導材料自体が反磁性を示す物質であるため、
単独で磁気シールド材として用いられていた。[Prior art] Conventionally, magnetic shielding materials using oxide superconducting materials are:
Since the oxide superconducting material itself is a substance showing diamagnetism,
It was used alone as a magnetic shielding material.
しかしながら、外部磁界の強度がHc1以上になると磁
束は超電導体中に侵入し、これを通過してしまうので、
Hc2（上部臨界磁場）未満の磁場中では磁気シールド材
として使用できなかった。However, the magnetic flux penetrates into the superconductor when the intensity of the external magnetic field is Hc 1 or more, so get through this,
It could not be used as a magnetic shielding material in a magnetic field lower than Hc 2 (upper critical magnetic field).
このため、そのような強い磁場中で使用できる磁気シ
ールド材とするためには、酸化物超電導体を複数層重ね
るか、あるいは、その厚みを増して、酸化物超電導体中
を流れる誘導電流による反磁性効果を利用して、該超電
導体を通過しようとする磁束の進行方向を、酸化物超電
導体面に平行な方向に変えるようにしている。Therefore, in order to provide a magnetic shielding material that can be used in such a strong magnetic field, it is necessary to stack a plurality of oxide superconductors, or increase the thickness of the superconductors, and reduce the thickness of the oxide superconductor by induced current flowing through the oxide superconductor. By utilizing the magnetic effect, the traveling direction of the magnetic flux passing through the superconductor is changed to a direction parallel to the oxide superconductor surface.
また、他の磁気シールド材として、例えばパーマロ
イ、フェライトのような強磁性材料が単独で用いられて
いることも公知であるが、これらのシールド材は強い引
力を発生するので、これを防ぐために全体の構造を強固
に且つ大がかりなものにしなければならないという問題
があった。It is also known that a ferromagnetic material such as permalloy or ferrite is used alone as another magnetic shielding material, but these shielding materials generate a strong attractive force. There is a problem that the structure must be made strong and large.
［発明が解決しようとする問題点］ しかしながら酸化物超電導体の中でも臨界温度の高い
Ｙ系、Bi系、Tl系の材料のHc1は、各々100Oe程度以下の
小さいものであり、これらの範囲の磁界中で使用される
場合は単独でも充分磁気シールドできるのであるが、10
0Oe以上の磁界が加わった場合には、磁束が酸化物超電
導体を通過してしまう。このため、磁界の強さがHc2以
上になっても磁束を通過させず、且つシールド材として
厚みをそれ程厚くする必要のない新規な磁気シールド材
が求められていた。[Problems to be Solved by the Invention] However, among oxide superconductors, Hc 1 of Y-based, Bi-based, and Tl-based materials having high critical temperatures is as small as about 100 Oe or less, respectively. When used in a magnetic field, magnetic shielding can be achieved by itself.
When a magnetic field of 0 Oe or more is applied, the magnetic flux passes through the oxide superconductor. For this reason, there has been a demand for a new magnetic shield material that does not allow a magnetic flux to pass even when the magnetic field strength is equal to or higher than Hc 2 and does not need to be so thick as a shield material.
［課題を解決するための手段］ 上記課題を解決するため、鋭意研究を続けているうち
に、本発明者等は、従来使用していた酸化物超電導材料
と磁性材料とを積層させることによって前者の厚みをそ
れ程厚くせずにHc1以上の磁界中でも磁束を遮断できる
ことを見い出し本発明を達成した。[Means for Solving the Problems] In order to solve the above problems, while continuing intensive research, the present inventors have found that the oxide superconducting material and the magnetic material, which have been conventionally used, are laminated to form the former. The present inventors have found that the magnetic flux can be cut off even in a magnetic field of Hc 1 or more without making the thickness of the film so large, thereby achieving the present invention.
すなわち本発明は、酸化物超伝導材料と磁性材料とを
積層した磁気シールド材であって、Hc2未満の磁場中で
充分な磁気シールド材効果を示すことを特徴とする超電
導磁気シールド材に関するものである。That is, the present invention relates to a magnetic shielding material in which an oxide superconducting material and a magnetic material are laminated, and which exhibits a sufficient magnetic shielding material effect in a magnetic field less than Hc 2 and relates to a superconducting magnetic shielding material. It is.
［作 用］ 本発明で使用する酸化物超電導体は、臨界温度の高い
Ｙ系、Bi系、Tl系の酸化物超電導体である。[Operation] The oxide superconductor used in the present invention is a Y-based, Bi-based, or Tl-based oxide superconductor having a high critical temperature.
これらの酸化物超電導体のHc1は、100Oe以下と低いた
めに本発明では、これらのうちから選ばれた超電導体の
薄板と透磁率の高い磁性体の薄板とを積層させて使用す
ることとした。Since Hc 1 of these oxide superconductors is as low as 100 Oe or less, in the present invention, a thin sheet of a superconductor selected from these and a thin sheet of a magnetic material having a high magnetic permeability are laminated and used. did.
上記磁性体として本明細書に示す実施例ではケイ素鋼
板を用いたが、この他パーマロイ、センダスト、マンガ
ン亜鉛フェライト等透磁率の高い磁性体の薄板をケイ素
鋼板の代りに用いて同様の効果が得られることを確認し
た。Although a silicon steel plate was used as the magnetic material in the examples shown in this specification, other similar effects can be obtained by using a thin magnetic material having high magnetic permeability such as permalloy, sendust, manganese zinc ferrite, etc. instead of the silicon steel plate. I confirmed that
また、本発明の磁気シールド材は、膜厚方向よりも面
内方向に磁化しやすい性質を有しているために、酸化物
超電導体に印加された磁界を減少させる効果があると共
に、更に酸化物超電導体の反磁場によりその磁界のシー
ルド効果を向上させることができるものである。Further, since the magnetic shield material of the present invention has a property of being easily magnetized in the in-plane direction rather than the film thickness direction, it has the effect of reducing the magnetic field applied to the oxide superconductor, and further has the effect of oxidizing. The shield effect of the magnetic field can be improved by the demagnetizing field of the superconductor.
以下、実施例により等に詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to examples.
［実施例１］ YBa2Cu3O7-xからなる酸化物超電導材料を用いて，密
度80％、縦横３インチ角、厚さ5mmの超電導体を作成
し、一方、同様に縦横３インチ角、厚さ1mmのケイ素鋼
板を作成して、第１図に示すように該ケイ素鋼板薄板を
２枚の超電導体薄板の間に挟んだ後、これらをハンダで
固定して磁気シールド材を作成した。Example 1 A superconductor having a density of 80%, a length of 3 inches square, and a thickness of 5 mm was prepared using an oxide superconducting material composed of YBa 2 Cu 3 O 7-x , while a width of 3 inches square. Then, a silicon steel sheet having a thickness of 1 mm was prepared and, as shown in FIG. 1, the silicon steel sheet was sandwiched between two superconductor sheets, and these were fixed with solder to form a magnetic shield material. .
この磁気シールド材を、液体チッ素を用いて液体チッ
素温度（77K）まで冷却すると共に、これに外部磁場1K
ガウスを電磁石で印加した。This magnetic shielding material is cooled to liquid nitrogen temperature (77K) using liquid nitrogen, and an external magnetic field of 1K
Gauss was applied with an electromagnet.
第１図に示す測定点１での磁場の強さは、20ガウスで
あった。これにより磁束が磁性体であるケイ素鋼板によ
り平面方向に曲げられて進行し、積層体は充分なるシー
ルド効果を有することが確認された。The strength of the magnetic field at the measurement point 1 shown in FIG. 1 was 20 Gauss. As a result, the magnetic flux was bent in the plane direction by the silicon steel plate, which is a magnetic material, and proceeded, and it was confirmed that the laminate had a sufficient shielding effect.
なお、酸化物超電導体であるYBa2Cu3O7-xの性能は、
臨界電流400A/cm2で、Tcは90Kであった。The performance of the oxide superconductor YBa 2 Cu 3 O 7-x is as follows.
At a critical current of 400 A / cm 2 , Tc was 90K.
［比較例１］ 実施例１の磁気シールド材からケイ素鋼板を取り除い
たものを用いて、実施例１と同様な条件下で磁場を測定
したところ、測定点１における磁場の強さは970ガウス
であり、ほとんどシールド効果が認められなかった。[Comparative Example 1] When a magnetic field was measured under the same conditions as in Example 1 using the magnetic shield material of Example 1 from which the silicon steel sheet had been removed, the magnetic field strength at measurement point 1 was 970 gauss. There was almost no shielding effect.
［実施例２］ BiPbSrCuOからなる酸化物超電導材料を用いて、密度7
5％、縦横３インチ角、厚さ5mmの超電導体薄板を作成
し、一方、同様に縦横３インチ角、厚さ1mmのケイ素鋼
板薄板を作成して、これらを第２図に示すようにハンダ
接合して磁気シールド材を作成した。Example 2 Using an oxide superconducting material composed of BiPbSrCuO, a density of 7
A 5%, 3 inch square, 5 mm thick superconductor thin plate was prepared. On the other hand, a 3 inch square, 1 mm thick silicon steel sheet was similarly formed, and these were soldered as shown in FIG. A magnetic shield material was created by joining.
上述の磁気シールド材を用いて、実施例１と同様な設
定条件下で測定点１における磁界の強さを測定したとこ
ろ、40ガウスであり、充分なシールド効果を有すること
が確認できた。Using the above-described magnetic shield material, the strength of the magnetic field at the measurement point 1 was measured under the same setting conditions as in Example 1. As a result, the strength was 40 gauss, and a sufficient shielding effect was confirmed.
［実施例３］ TlBaCaCuOからなる酸化物超電導材料を用いて、密度7
5％、縦横３インチ角、厚さ3mmの超電導体薄板を作成
し、一方、同様に縦横３インチ角、厚さ1mmのケイ素鋼
板薄板を作成し、これらを第３図に示すように５層に積
層してハンダ固定を行い、磁気シールド材を作成した。Example 3 Using an oxide superconducting material composed of TlBaCaCuO,
5%, 3 inch square, 3 mm thick superconductor thin plate was prepared. On the other hand, similarly, 3 inch square, 1 mm thick silicon steel sheet was prepared, and these were laminated into 5 layers as shown in FIG. And a magnetic shield material was created by soldering.
上述の磁気シールド材を用いて、実施例１と同様な設
定条件下で測定点１における磁界の強さを測定したとこ
ろ、90ガウスであり充分なシールド効果を有することが
確認できた。Using the above-described magnetic shield material, the strength of the magnetic field at the measurement point 1 was measured under the same setting conditions as in Example 1. The strength was 90 gauss, and a sufficient shielding effect was confirmed.
［発明の効果］ 本発明の磁気シールド材は、上述のように酸化物超電
導体の有する反磁性と、磁性体の有する透磁性とを有効
に利用したものであり、簡単な構造であるにも拘らず実
質的なシールド効果は非常に大きい。[Effects of the Invention] The magnetic shielding material of the present invention effectively utilizes the diamagnetism of the oxide superconductor and the magnetic permeability of the magnetic material as described above, and has a simple structure. Regardless, the substantial shielding effect is very large.
従って本発明に係る磁気シールド材を用いることによ
り、磁気シールドを必要とする各種設備を安価に且つ少
量の使用で製造できるという利点がある。Therefore, by using the magnetic shield material according to the present invention, there is an advantage that various facilities requiring a magnetic shield can be manufactured at low cost and with a small amount of use.
第１図は、実施例１の測定試験で用いた磁気シールド材
とマグネットの断面構造および配置を示す図である。第
２図は、実施例２の測定試験で用いた磁気シールド材と
マグネットの断面構造および配置を示す図である。第３
図は、実施例３の測定試験で用いた磁気シールド材とマ
グネットの断面構造および配置を示す図である。 符号の説明 １……測定点 ２……磁性体 ３……酸化物超電導体 ４……マグネットFIG. 1 is a diagram showing a cross-sectional structure and arrangement of a magnetic shield material and a magnet used in a measurement test of Example 1. FIG. 2 is a diagram showing a cross-sectional structure and arrangement of a magnetic shield material and a magnet used in a measurement test of Example 2. Third
FIG. 9 is a diagram showing a cross-sectional structure and arrangement of a magnetic shield material and a magnet used in the measurement test of Example 3. Explanation of reference numerals 1 ... Measurement point 2 ... Magnetic material 3 ... Oxide superconductor 4 ... Magnet
フロントページの続き (56)参考文献 特開 昭64−50499（ＪＰ，Ａ) 特開 昭63−276297（ＪＰ，Ａ) 特開 昭63−233577（ＪＰ，Ａ) 特開 昭63−313897（ＪＰ，Ａ) 特開 昭63−77174（ＪＰ，Ａ) 特開 昭64−50482（ＪＰ，Ａ) 特開 昭63−248184（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H05K 9/00Continuation of front page (56) References JP-A-64-50499 (JP, A) JP-A-63-276297 (JP, A) JP-A-63-233577 (JP, A) JP-A-63-313897 (JP) JP-A-63-77174 (JP, A) JP-A-64-50482 (JP, A) JP-A-63-248184 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB Name) H05K 9/00
Claims (6)
が75％以上の酸化物超電導材薄板と少なくとも１枚の磁
性材料薄板とを交互に積層した構成体からなる100〜100
0ガウスの磁場中での磁気シールドに適する超電導磁気
シールド材。1. A structure comprising at least one sheet of oxide superconducting material having a thickness of at least 3 mm and a density of at least 75% and at least one sheet of magnetic material alternately laminated.
Superconducting magnetic shielding material suitable for magnetic shielding in a magnetic field of 0 Gauss.
である請求項１記載の超電導磁気シールド材。2. The superconducting magnetic shield material according to claim 1, wherein the density of the oxide superconducting material thin plate is 80% or more.
である請求項１または２記載の超電導磁気シールド材。3. The superconducting magnetic shield material according to claim 1, wherein the thickness of the oxide superconducting material thin plate is 5 mm or more.
系の酸化物超電導体から選ばれた酸化物超電導体である
請求項１、２または３記載の超電導磁気シールド材。4. The method according to claim 1, wherein the oxide superconducting material is Y-based, Bi-based or Tl-based.
The superconducting magnetic shielding material according to claim 1, 2 or 3, which is an oxide superconductor selected from a series of oxide superconductors.
イ、センダストおよびマンガン亜鉛フェライトからなる
群より選ばれた磁性体薄板である請求項１〜４のいずれ
かに記載の超電導磁気シールド材。5. The superconducting magnetic shielding material according to claim 1, wherein said magnetic material thin plate is a magnetic thin plate selected from the group consisting of silicon steel plate, permalloy, sendust and manganese zinc ferrite.
る請求項５記載の超電導磁気シールド材。6. The superconducting magnetic shield material according to claim 5, wherein said magnetic thin plate is a thin plate having a thickness of 1 mm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204514A JP2821772B2 (en) | 1989-08-07 | 1989-08-07 | Superconducting magnetic shield material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204514A JP2821772B2 (en) | 1989-08-07 | 1989-08-07 | Superconducting magnetic shield material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0368199A JPH0368199A (en) | 1991-03-25 |
| JP2821772B2 true JP2821772B2 (en) | 1998-11-05 |
Family
ID=16491793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1204514A Expired - Lifetime JP2821772B2 (en) | 1989-08-07 | 1989-08-07 | Superconducting magnetic shield material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2821772B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9810751B2 (en) * | 2014-02-24 | 2017-11-07 | Northrop Grumman Systems Corporation | Customized magnetic susceptibility materials |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6377174A (en) * | 1986-09-19 | 1988-04-07 | Fujitsu Ltd | Superconducting shield |
| JP2527554B2 (en) * | 1987-03-23 | 1996-08-28 | 大阪府 | Superconducting magnetic shield |
| JPS63248184A (en) * | 1987-04-02 | 1988-10-14 | Sumitomo Electric Ind Ltd | Electromagnetic-wave shielding material |
| JPS63276297A (en) * | 1987-05-07 | 1988-11-14 | Mitsubishi Electric Corp | Copper clad substrate |
| JPS63313897A (en) * | 1987-06-17 | 1988-12-21 | Hitachi Ltd | Magnetic shielding body |
| JPH084199B2 (en) * | 1987-08-20 | 1996-01-17 | 株式会社フジクラ | Superconducting magnetic shield |
| JPS6450482A (en) * | 1987-08-21 | 1989-02-27 | Hitachi Ltd | Magnetic shielding device |
-
1989
- 1989-08-07 JP JP1204514A patent/JP2821772B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0368199A (en) | 1991-03-25 |
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