JPH01161896A - Element for magnetic shielding - Google Patents
Element for magnetic shieldingInfo
- Publication number
- JPH01161896A JPH01161896A JP62320441A JP32044187A JPH01161896A JP H01161896 A JPH01161896 A JP H01161896A JP 62320441 A JP62320441 A JP 62320441A JP 32044187 A JP32044187 A JP 32044187A JP H01161896 A JPH01161896 A JP H01161896A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic shielding
- main body
- oxide
- holes
- element main
- 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 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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】 ［発明の目的］ （産業上の利用分野） 本発明は、磁気シールド用エレメントに係り。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic shielding element.
特に、エレメント本体が酸化物系超電導材で形成された
エレメントに関する。In particular, the present invention relates to an element whose main body is made of an oxide superconducting material.
（従来の技術）
最近１組成がＹ−Ｂａ−Ｃｕ−０などで表わされる酸化
物系化合物超電導体が注目されている。これら。(Prior Art) Recently, oxide-based compound superconductors whose composition is represented by Y--Ba--Cu-0, etc., have been attracting attention. these.
酸化物系化合物超電導体の多くは、臨界温度が液体窒素
温度以上である。このため、冷媒として高価で扱い難い
液体ヘリウムを使用する必要がないので、超電導技術を
飛躍的に発展させるものと期待されている。Many of the oxide-based compound superconductors have a critical temperature equal to or higher than the liquid nitrogen temperature. This eliminates the need to use liquid helium, which is expensive and difficult to handle, as a refrigerant, and is expected to dramatically advance superconducting technology.
ところで、超電導体はマイスナー効果によって磁界を完
全に遮蔽する特性を有している。勿論。By the way, superconductors have the property of completely shielding magnetic fields due to the Meissner effect. Of course.
酸化物系超電導材も例外ではない。したがって。Oxide-based superconducting materials are no exception. therefore.
酸化物系超電導材で磁気シールドを構成すると。When a magnetic shield is constructed from an oxide-based superconducting material.
合金系や金属間化合物系の超電導材で磁気シールドを構
成した場合に比べて、制作費を軽減でき。Production costs can be reduced compared to when magnetic shields are made of superconducting materials such as alloys or intermetallic compounds.
しかも安価で扱い易い液体窒素を使用できるので維持費
も軽減できる。このようなことから、最近では高磁界磁
気共鳴イメージング装置などの磁気シールドを酸化物系
超電導材で構成する提案もなされている。酸化物系超電
導材は１通常、粉末原料に酸素中で熱処理を施して作ら
れる。したがって、磁気シールド用のエレメントを作る
ときには。Moreover, since liquid nitrogen can be used, which is inexpensive and easy to handle, maintenance costs can be reduced. For this reason, there have recently been proposals to construct magnetic shields for high-field magnetic resonance imaging devices and the like using oxide-based superconducting materials. Oxide-based superconducting materials are usually made by subjecting powder raw materials to heat treatment in oxygen. Therefore, when making elements for magnetic shielding.
粉末原料を板状に展開し、圧縮して緻密化した後。After the powder raw material is expanded into a plate shape and compressed to become densified.
酸素雰囲気中で熱処理を行なえばよい。Heat treatment may be performed in an oxygen atmosphere.
しかしながら、上記のようにして形成された従来の磁気
シールド用エレメントにあっては次のような問題があっ
た。すなわち、酸化物系超電導材は、いわゆる焼き物で
あり、非常に脆い。このため、酸化物系超電導材で磁気
シールド用エレメントを構成するときには、エレメント
の厚みをある程度厚くして機械的強度性を確保する必要
がある。However, the conventional magnetic shielding element formed as described above has the following problems. That is, the oxide-based superconducting material is a so-called ceramic material and is extremely brittle. Therefore, when constructing a magnetic shielding element using an oxide-based superconducting material, it is necessary to increase the thickness of the element to some extent to ensure mechanical strength.
しかし、このようにエレメントの厚みを厚くすると、熱
処理時に熱応力によってクラックが発生したり、また液
体窒素で冷却したときも第２図に示すように、熱応力で
エレメント１にクラック２が発生し、これが原因して良
好な磁気シールド機能を発揮できない問題があった。However, if the thickness of the element is increased in this way, cracks may occur due to thermal stress during heat treatment, and cracks 2 may occur in element 1 due to thermal stress when cooled with liquid nitrogen, as shown in Figure 2. Due to this, there was a problem that a good magnetic shielding function could not be exhibited.
（発明が解決しようとする問題点）
上述の如く、酸化物系超電導材で形成された従来の磁気
シールド用エレメントにあっては、構造上熱応力に弱く
、これが原因して良好なシールド機能を発揮できない問
題があった。(Problems to be Solved by the Invention) As mentioned above, conventional magnetic shielding elements made of oxide-based superconducting materials are structurally susceptible to thermal stress, which makes it difficult to achieve good shielding performance. There was a problem with not being able to perform.
そこで本発明は、熱応力の問題を解消でき、もって酸化
物系超電導材の特徴を最大限に発揮させ得る磁気シール
ド用エレメントを提供することを目的としている。Therefore, an object of the present invention is to provide a magnetic shielding element that can solve the problem of thermal stress and thereby maximize the characteristics of oxide-based superconducting materials.
［発明の構成］ （問題点を解決するための手段） 本発明に係る磁気シールド用エレメントは。[Structure of the invention] (Means for solving problems) A magnetic shielding element according to the present invention.
酸化物系超電導材で板状に形成されたエレメント本体と
、このエレメント本体に複数設けられた孔とで構成され
ている。It consists of an element body formed in a plate shape from an oxide superconducting material, and a plurality of holes provided in the element body.
（作 用）
エレメント本体に設けられた複数の孔は、熱処理を行な
って酸化物系超電導体層を合成するとき、各部の温度を
均一化するのに寄与する。また。(Function) The plurality of holes provided in the element body contribute to making the temperature of each part uniform when performing heat treatment to synthesize the oxide-based superconductor layer. Also.
複数の孔はエレメント本体を液体窒素で冷却して超電導
状態にするときも各部の温度を均一化するのに寄与する
。したがって、熱応力でエレメント本体にクラックが入
るのを防止でき、良好な磁気シールド機能を発揮させる
ことが可能となる。The plurality of holes also contribute to making the temperature of each part uniform when the element body is cooled with liquid nitrogen to become superconducting. Therefore, it is possible to prevent the element body from cracking due to thermal stress, and it is possible to exhibit a good magnetic shielding function.
（実施例） 以下９図面を参照しながら実施例を説明する。(Example) Examples will be described below with reference to nine drawings.
第１図は本発明に係る磁気シールド用エレメントを示す
ものである。このエレメントは、板状に形成されたエレ
メント本体１１と、このエレメント本体１１に複数規則
的に設けられた孔１２とで構成されている。FIG. 1 shows a magnetic shielding element according to the present invention. This element is composed of an element body 11 formed in a plate shape and a plurality of holes 12 regularly provided in the element body 11.
エレメント本体１１は、この実施例では酸化イツトリウ
ム粉末と、炭酸バリウム粉末と、酸化銅粉末とをモル比
で０．５ ： １．０ ： ３．０の割合に混合した混
合物を板状に展開し、これに圧縮力を加えて緻密な板体
を形成した後、この板体に酸素雰囲気中で熱処理を施し
て酸化物系超電導体層を合成したものとなっている。そ
して、前記孔１２は緻密な板体を形成するときに型枠に
よって形成されている。In this embodiment, the element body 11 is made by rolling out a mixture of yttrium oxide powder, barium carbonate powder, and copper oxide powder in a molar ratio of 0.5:1.0:3.0 into a plate shape. After applying compressive force to this to form a dense plate, this plate was subjected to heat treatment in an oxygen atmosphere to synthesize an oxide-based superconductor layer. The holes 12 are formed by a mold when forming a dense plate.
このような構成であると、エレメント本体１１の肉厚が
厚い場合でも、孔１２の存在によって熱処理時における
各部の温度をほぼ均一化できる。With such a configuration, even if the element body 11 has a large wall thickness, the presence of the holes 12 makes it possible to substantially uniformize the temperature of each part during heat treatment.
また、実際に磁気シールド体として使用する際に液体窒
素で冷却した場合も、孔１２の存在によって各部の温度
を均一化できる。したがって、エレメント本体１１に生
じる熱応力を小さくでき、熱応力によって起こるクラッ
クの発生を防止できる。Further, even when cooling with liquid nitrogen when actually used as a magnetic shield, the temperature of each part can be made uniform due to the presence of the holes 12. Therefore, the thermal stress generated in the element body 11 can be reduced, and cracks caused by thermal stress can be prevented from occurring.
このため、良好な磁気シールド機能を発揮させることが
できる。Therefore, a good magnetic shielding function can be exhibited.
なお１本発明は上記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.
すなわち、上記実施例ではエレメント本体に複数の丸い
貫通孔を設けているが、孔の形状は限定されない。また
、エレメント本体を構成する原料も酸化物系超電導材を
合成できるものであればよく、イツトリウム系の原料に
限定されるものではない。That is, in the above embodiment, a plurality of round through holes are provided in the element body, but the shape of the holes is not limited. Further, the raw material constituting the element body may be any material as long as it can synthesize an oxide-based superconducting material, and is not limited to yttrium-based materials.
［発明の効果コ
以上述べたように２本発明によれば、熱応力でクラック
が発生するのを防止でき、もって良好な磁気シールド機
能を発揮する磁気シールド用エレメントを提供できる。[Effects of the Invention] As described above, according to the present invention, it is possible to provide a magnetic shielding element that can prevent cracks from occurring due to thermal stress and thereby exhibits a good magnetic shielding function.
第１図は本発明の一実施例に係る磁気シールド用エレメ
ントの斜視図、第２図は従来の磁気シールド用エレメン
トの斜視図である。
１１・・・エレメント本体、１２・・・孔。
出願人代理人 弁理士 鈴江武彦
第１図
第２図FIG. 1 is a perspective view of a magnetic shielding element according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional magnetic shielding element. 11... Element body, 12... Hole. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2
Claims (2)
本体と，このエレメント本体に複数設けられた孔とを具
備してなることを特徴とする磁気シールド用エレメント
。(1) A magnetic shielding element comprising an element body formed in a plate shape from an oxide superconducting material and a plurality of holes provided in the element body.
−Ｏで表わされる化合物超電導体層を備えたものである
ことを特徴とする特許請求の範囲第１項記載の磁気シー
ルド用エレメント。(2) The oxide-based superconducting material has a composition of Y-Ba-Cu.
2. A magnetic shielding element according to claim 1, characterized in that it is provided with a compound superconductor layer represented by -O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320441A JPH01161896A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320441A JPH01161896A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01161896A true JPH01161896A (en) | 1989-06-26 |
Family
ID=18121482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62320441A Pending JPH01161896A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01161896A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100401980B1 (en) * | 1998-08-31 | 2004-01-24 | 주식회사 포스코 | A magnetic shield window having superior visibility |
-
1987
- 1987-12-18 JP JP62320441A patent/JPH01161896A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100401980B1 (en) * | 1998-08-31 | 2004-01-24 | 주식회사 포스코 | A magnetic shield window having superior visibility |
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