JPH01312899A - Structure of magnetic shield plate using superconductor - Google Patents
Structure of magnetic shield plate using superconductorInfo
- Publication number
- JPH01312899A JPH01312899A JP63141844A JP14184488A JPH01312899A JP H01312899 A JPH01312899 A JP H01312899A JP 63141844 A JP63141844 A JP 63141844A JP 14184488 A JP14184488 A JP 14184488A JP H01312899 A JPH01312899 A JP H01312899A
- Authority
- JP
- Japan
- Prior art keywords
- shape
- superconductor
- shield plate
- magnetic
- plate
- 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.)
- Pending
Links
- 239000002887 superconductor Substances 0.000 title claims abstract description 18
- 230000004907 flux Effects 0.000 abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は超電導体を磁気シールド板として用いる場合に
おいて磁気シールドを効率良く実現するための構造に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure for efficiently realizing magnetic shielding when a superconductor is used as a magnetic shielding plate.
（従来の技術）
近年、酸化物超電導体の利用方法の一例として、磁気シ
ールド板として酸化物超電導体の薄板焼結体を使用する
ことが有望視されている。その際、酸化物超電導体はそ
の製造の容易さから平面板として使用され、磁気シール
ド構造を形成することが多かった。(Prior Art) In recent years, as an example of a method of utilizing oxide superconductors, the use of thin plate sintered bodies of oxide superconductors as magnetic shield plates has been viewed as promising. At that time, oxide superconductors were often used as flat plates because of their ease of manufacture, forming magnetic shield structures.
（発明が解決しようとする課題）
しかしながら、平面板の磁気シールド板では、シールド
する部屋の角あるいはシールド板間のつぎ目で磁束が漏
洩する問題が生じていた。また、この漏洩を防止するた
め多重にシールド板を配置した場合は、シールド板の枚
数が多く必要となり、スペースが必要となる問題もあっ
た。(Problems to be Solved by the Invention) However, with flat magnetic shield plates, there has been a problem that magnetic flux leaks at the corners of the room being shielded or at the seams between the shield plates. Further, when multiple shield plates are arranged to prevent this leakage, a large number of shield plates are required, and there is also a problem that space is required.
本発明の目的は上述した課題を解消して、効率の良い磁
気シールドが可能な磁気シールド板の構造を提供しよう
とするものである。An object of the present invention is to solve the above-mentioned problems and provide a structure of a magnetic shield plate that can provide efficient magnetic shielding.
（課題を解決するための手段）
本発明の超電導体を用いた磁気シールド板の構造は、所
定形状の曲面を有することを特徴とするものである。(Means for Solving the Problems) The structure of the magnetic shield plate using the superconductor of the present invention is characterized by having a curved surface of a predetermined shape.
（作 用）
上述した構成において、シールドする部屋等の形状に合
った円筒形状あるいはＲ形状等の所定形状の曲面を有す
る薄板焼結体を用いることにより、平面板のみで形成し
た場合に比べて板間のつぎ目を少なくでき、漏洩する磁
束を減少させることができる。(Function) In the above-mentioned configuration, by using a thin plate sintered body having a curved surface of a predetermined shape such as a cylindrical shape or an R-shape that matches the shape of the room to be shielded, compared to a case where it is formed using only a flat plate. The number of seams between the plates can be reduced, and leakage of magnetic flux can be reduced.
また、端辺に段部を有するシールド板を使用した場合は
、つぎ目を重ねて漏洩磁束を減少した状態で敷き詰める
ことが可能となるためさらに好ましい。Further, it is more preferable to use a shield plate having a stepped portion on the edge because it becomes possible to overlap the seams and spread the shield plate in a state in which leakage magnetic flux is reduced.
なお、所定形状を有する磁気シールド板を得るには、ド
クターブレード法などの方法により成形した可塑性を有
するグリーンシー １−を、所定形状に変形させ、変形
した成形体を焼結する従来から公知の方法を利用づるこ
とかできる。また、シールド板に寸法精度を要求する場
合は、同様な方法で超電導体からなる薄板焼結体を作製
した後、この薄板焼結体を好ましくは８５０・・・１０
００°Ｃの高温にて変形させて所定の形状にすると好ま
しい。In addition, in order to obtain a magnetic shielding plate having a predetermined shape, a conventionally known method is used in which a green sheet having plasticity formed by a method such as a doctor blade method is deformed into a predetermined shape, and the deformed molded body is sintered. You can use this method. In addition, if dimensional accuracy is required for the shield plate, after producing a thin plate sintered body made of a superconductor by the same method, this thin plate sintered body is preferably 850...10
It is preferable to deform it into a predetermined shape at a high temperature of 00°C.
（実施例）
酸化物超電導仮焼粉末ＹＢａ２Ｃυ３０．δを１００重
量部に対し、ポリビニルブチラール（ＰＶＢ） ５重
量部、Ｉ・ルエン４０重量部をボンドミルにて１０ｈ混
合した。(Example) Oxide superconducting calcined powder YBa2Cυ30. 100 parts by weight of δ, 5 parts by weight of polyvinyl butyral (PVB) and 40 parts by weight of I.luene were mixed for 10 hours in a bond mill.
）ｆ成したスラリーを真空引きＪ−１脱泡した後、ドク
ターブレード成形機により幅３８０ｎｏｎ、厚さ］ 、
６ｍｍ、長さ３８０ｍｍのグリーンシートを成形し、
密閉した大気中で１晩乾燥した。) The formed slurry was degassed by vacuuming J-1, and then processed using a doctor blade molding machine to a width of 380 mm and a thickness of 380 mm.
Form a green sheet of 6mm and length 380mm,
Dry overnight in a closed atmosphere.
グリーンシートを大気中で９００〜１０００“Ｃで１０
時間焼結し、降温速度２’Ｃ／ｍｉｎで徐冷した。焼結
体は密度８０％、３００ ×、 ３００ Ｘ ｌ、 Ｏ
ｍｍで９２にで電気抵抗が０またマイスナー効果を観察
し高温超電導体であることを確認した。Green sheet at 900-1000"C in air for 10
The material was sintered for a period of time and slowly cooled at a cooling rate of 2'C/min. The sintered body has a density of 80%, 300 × 300 × l, O
At 92 mm, the electrical resistance was 0 and the Meissner effect was observed, confirming that it was a high-temperature superconductor.
まず、第１の実施例として、得られた焼結体１を第１図
（ａ）に示すＲ形状または第１図（ｂ） ｌこ示す円筒
形状のアルミナ２の上に置き、９００〜９５０°Ｃで２
時間法（孔中で熱処理して１２形状または円筒形状の所
定形状の曲面を有する第１図（ｃ）あるいは第１図（ｄ
） ｌ：ぞの斜視図を示ｒ超電導体の磁気シールド板を
得た。First, as a first example, the obtained sintered body 1 was placed on an alumina 2 having an R shape as shown in FIG. 1(a) or a cylindrical shape as shown in FIG. 1(b). 2 at °C
Time method (Fig. 1(c) or Fig. 1(d) in which a curved surface of a predetermined shape of 12 shapes or cylindrical shapes is formed by heat treatment in a hole.
) A magnetic shield plate of a superconductor was obtained.
次に、第２の実施例として、第２図（ａ）に示１゛よう
に、得ら１つ−た焼結体ｌの端辺のＦにアルミナ板２−
１を置き、さらにその上からアルミナ板２−２で１０
ＭＰａの荷重を負荷し、９００°Ｃで２時間大気中で熱
処理し５ゝ−５降温速度は２’Ｃ／ｍｉｎで行なった。Next, as a second example, as shown in FIG. 2(a), an alumina plate 2-
Place 1, and then place 10 on top of it with alumina plate 2-2.
A load of MPa was applied, and heat treatment was carried out at 900°C for 2 hours in the air, with a cooling rate of 5'-5 of 2'C/min.
熱処理後の段部３およびその端部の切り欠き部４を有す
る超電導体の磁気シールド板の平面図および側面図を第
２図（ｂ）および第２図（ｃ）に示す。FIGS. 2(b) and 2(c) show a plan view and a side view of a superconducting magnetic shield plate having a step portion 3 and a notch portion 4 at the end thereof after heat treatment.
さらに、第３の実施例として、第２図に示した端辺に段
部を有する平面板を第１図に示した円筒面あるいはＲ形
状に変形させることにより、端辺に段部を有し円筒形状
あるいは１７形状の所定形状の曲面を有する超電導体の
磁気シールド板を得ることができた。Furthermore, as a third embodiment, by deforming the flat plate having steps on the edges shown in FIG. 2 into the cylindrical surface or R shape shown in FIG. It was possible to obtain a superconductor magnetic shielding plate having a cylindrical or 17-shaped curved surface.
以下、実際に端辺に段部を有する焼結体を４枚敷き詰め
て磁気シールド能を測定した例について説明する。磁気
シールド能測定装置は、第３図に示すように、液体窒素
容器５、電磁イ」６、ガウスメータ（磁束密度測定装置
）７からなり、試料８を電磁石とガウスメータ７との間
に挿入し、液体窒素の存在下で電磁石６により定磁場を
発生してガウスメータ７により漏洩磁場を測定する装置
である。Hereinafter, an example will be described in which the magnetic shielding ability was actually measured by laying four sintered bodies having stepped portions on the edges. As shown in FIG. 3, the magnetic shielding ability measuring device consists of a liquid nitrogen container 5, an electromagnet 6, and a Gaussmeter (magnetic flux density measuring device) 7, and a sample 8 is inserted between the electromagnet and the Gaussmeter 7. This device generates a constant magnetic field using an electromagnet 6 in the presence of liquid nitrogen and measures the leakage magnetic field using a Gaussmeter 7.
端辺に段部を有する焼結体を４枚第４図に示すように敷
き詰め、測定できる大きさにするため中央部を残して２
０（ｌ Ｘ ２００ｍｍ図中１点鎖線で示すように切り
出し、ステンレス板に接着剤により敷き詰めて接着し測
定試料とした。つなぎ目の中央部が最大磁場となるよう
に装置にセットし、漏洩磁束が０．Ｏｌガウス以下の完
全磁場シールドが可能な最大引加磁場を測定した。完全
シールド能は１５ガウスで１枚の平面板での値である１
７ガウスとほぼ同等の結果を得た。Four sintered bodies with stepped edges are laid out as shown in Figure 4, leaving two pieces in the center to make a size that can be measured.
0 (l x 200 mm) was cut out as shown by the dashed line in the figure, and was spread and adhered to a stainless steel plate with an adhesive to form a measurement sample. It was set in the device so that the maximum magnetic field was at the center of the joint, and the leakage magnetic flux was We measured the maximum applied magnetic field that allows complete magnetic field shielding of less than 0.Ol gauss.The complete shielding ability is 15 gauss, which is the value of 1 flat plate.
We obtained results almost equivalent to 7 Gauss.
これに対し、同様の方法により端辺に段部を有しない平
面板を４枚敷き詰めた試料について測定した。シールド
能は２ガウスでつぎ目のすき間から所定量以上に磁束が
漏洩した。On the other hand, measurements were made using a similar method on a sample of four flat plates with no stepped edges. The shielding capacity was 2 Gauss, and more than a predetermined amount of magnetic flux leaked from the gap between the joints.
円筒面ををする焼結体、Ｒ形状を有する焼結体について
も磁気シールド能を測定したが、１７ガウスで平面板と
同等の性能を示した。The magnetic shielding ability was also measured for a sintered body with a cylindrical surface and a sintered body with an R shape, and the magnetic shielding ability was found to be equivalent to that of a flat plate at 17 Gauss.
本発明はト述した実施例にのみ限定されるものではなく
、幾多の変形、変更が可能である。例えば、上述した実
施例においては、酸化物超電導体としてＹＢａｚＣｕ３
０ｔ−δを使用したが、他の酸化物超電導体例えば上記
組成においてＹを希土類元素に置き換えたものでもクリ
ープ速度の大きいものであれば、本発明を好適に応用で
きることはいうまでもない。また、薄板成形の方法もド
クターブレード法に限定されるものではなく、他の公知
の方法例えばプレス法、押し出し法等を利用できること
はいうまでもない。The present invention is not limited to the embodiments described above, and can be modified and changed in many ways. For example, in the above embodiment, YBazCu3 is used as the oxide superconductor.
Although 0t-δ was used, it goes without saying that the present invention can be suitably applied to other oxide superconductors, such as those having the above composition in which Y is replaced with a rare earth element, as long as they have a high creep rate. Further, the method of forming a thin plate is not limited to the doctor blade method, and it goes without saying that other known methods such as a press method, an extrusion method, etc. can be used.
（発明の効果）
以上の説明から明らかなように、本発明の超電導体を用
いた磁気シールド板の構造によれば、シールドする部屋
等の形状に合った円筒構造あるいはＲ形状の所定形状の
曲面を有する超電導体からなるシールド板を用いること
により２、漏洩する磁束を減少させることができ、磁気
シールドを効率よ〈実施するこ七ができる。(Effects of the Invention) As is clear from the above explanation, the structure of the magnetic shield plate using the superconductor of the present invention has a cylindrical structure that matches the shape of the room to be shielded, or a curved surface of a predetermined R shape. By using a shield plate made of a superconductor having 2. leakage magnetic flux can be reduced and magnetic shielding can be carried out efficiently.
また、端辺に段部を存するシールド板を使用した場合は
、つぎ目を重ねて漏洩磁束を減少させることができるた
め、さらに好適に磁気シールドを達成することができる
。Further, when a shield plate having a stepped portion on the end side is used, the seams can be overlapped to reduce leakage magnetic flux, so that magnetic shielding can be achieved even more favorably.
第１図（ａ＞、（ｂ）はそれぞれ本発明のシールド板を
形成する方法の一例を示す図、
第１図（υ、（ｄ）はそれぞれ本発明のシールド板の一
例の構成を示す図、
第２図（ａ）は本発明のシールド板を形成する方法の他
の例を示す図、
第２図（ｂ） 、 （ｃ）は本発明のシールド板の他の
例の構成を示す平面図および側面図、
第３図は磁気シールド能測定装置の一例の構成を示す斜
視図、
第４図は試料の形状を示す図である。
１・・・焼結体
２・・・アルミナ
２１．２２・・・アルミナ板
３・・・段部 ４・・・切欠き部５・・・
液体窒素容器 ６・・・電磁石７・・・ガウスメー
タ ８・・・試料第１図
（ａ） （Ｃ）
＜ｂ＞ （ｄン第２図
（ａ）
（ｂ）
第３図
第４図
手 続 補 正 書
昭和６３年 ８月 ２日
特許庁長官 吉 １） 文 毅 殿１、事件
の表示
昭和６３年特許願第１４１８４４号
２、発明の名称
３、補正をする者
事件との関係 特許出願人
４、代理人Figures 1 (a> and (b) are diagrams each showing an example of a method for forming a shield plate of the present invention, and Figures 1 (υ and (d) are diagrams each showing a configuration of an example of a shield plate of the present invention. , FIG. 2(a) is a diagram showing another example of the method for forming the shield plate of the present invention, and FIGS. 2(b) and (c) are plan views showing the structure of another example of the shield plate of the present invention. Figure 3 is a perspective view showing the configuration of an example of a magnetic shielding ability measuring device, and Figure 4 is a diagram showing the shape of a sample. 1... Sintered body 2... Alumina 21. 22...Alumina plate 3...Step part 4...Notch part 5...
Liquid nitrogen container 6...Electromagnet 7...Gaussmeter 8...Sample Figure 1 (a) (C) <b> (d-Figure 2 (a) (b) Figure 3 Figure 4 Procedure Amendment Written by: August 2, 1988 Director General of the Japan Patent Office Yoshi 1) Moon Takeshi 1, Indication of the case Patent Application No. 141844 of 1988 2, Title of the invention 3, Person making the amendment Relationship with the case Patent applicant 4. Agent
Claims (1)
を用いた磁気シールド板の構造。 ２、端辺に段部を有することを特徴とする請求項１記載
の超電導体を用いた磁気シールド板の構造。[Scope of Claims] 1. A structure of a magnetic shield plate using a superconductor characterized by having a curved surface of a predetermined shape. 2. The structure of a magnetic shield plate using a superconductor according to claim 1, which has a stepped portion on an edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63141844A JPH01312899A (en) | 1988-06-10 | 1988-06-10 | Structure of magnetic shield plate using superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63141844A JPH01312899A (en) | 1988-06-10 | 1988-06-10 | Structure of magnetic shield plate using superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01312899A true JPH01312899A (en) | 1989-12-18 |
Family
ID=15301473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63141844A Pending JPH01312899A (en) | 1988-06-10 | 1988-06-10 | Structure of magnetic shield plate using superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01312899A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03198400A (en) * | 1989-12-27 | 1991-08-29 | Nippon Cement Co Ltd | Manufacture of magnetic shielding material |
| JP2016096237A (en) * | 2014-11-14 | 2016-05-26 | Ｎｅｃトーキン株式会社 | Magnetic member and method for manufacturing the same |
-
1988
- 1988-06-10 JP JP63141844A patent/JPH01312899A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03198400A (en) * | 1989-12-27 | 1991-08-29 | Nippon Cement Co Ltd | Manufacture of magnetic shielding material |
| JP2016096237A (en) * | 2014-11-14 | 2016-05-26 | Ｎｅｃトーキン株式会社 | Magnetic member and method for manufacturing the same |
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