JPH01161900A - Element for magnetic shielding - Google Patents
Element for magnetic shieldingInfo
- Publication number
- JPH01161900A JPH01161900A JP62320445A JP32044587A JPH01161900A JP H01161900 A JPH01161900 A JP H01161900A JP 62320445 A JP62320445 A JP 62320445A JP 32044587 A JP32044587 A JP 32044587A JP H01161900 A JPH01161900 A JP H01161900A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic shielding
- main body
- oxide
- element main
- powder
- 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
- 239000000463 material Substances 0.000 claims abstract description 19
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 9
- 239000004917 carbon fiber Substances 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 239000002887 superconductor Substances 0.000 claims abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 239000000843 powder Substances 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 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
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 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
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram 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
- 238000000034 method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000002002 slurry Substances 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装置を構成すると１合
金系や金属間化合物系の超電導材で磁気シールド装置を
構成した場合に比べて、製作費を軽減でき、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
ージング装置などに組み込まれる磁気シールド装置を酸
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、粉末原料をたとえば板状に展開し、圧
縮して緻密化した後、酸素雰囲気中で熱処理を行なえば
よい。When a magnetic shielding device is constructed using oxide-based superconducting materials, manufacturing costs can be reduced compared to when a magnetic shielding device is constructed using alloy-based or intermetallic compound-based superconducting materials, and liquid nitrogen, which is inexpensive and easy to handle, is used. As a result, maintenance costs can also be reduced. For this reason, there have recently been proposals to construct magnetic shielding devices incorporated into 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 a magnetic shielding element, the powder raw material may be expanded into a plate shape, compressed to become dense, and then heat treated 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 a certain 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にも熱応力でエレメントにクラッ
クが発生したりし、これが原因して良好な磁気シールド
機能を発揮させることが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 may occur in the element due to thermal stress when cooled with liquid nitrogen. There was a problem that the magnetic shielding function could not be demonstrated.
（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、構造的に熱応力に弱
く、これが原因して良好なシールド機能を発揮させるこ
とが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, and due to this, good shielding function cannot be achieved. There was a problem that it was not possible to make the most of the performance.
そこで本発明は、熱応力に弱い点および機械的強度が低
い点を解消でき、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。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic shielding element that can eliminate the weaknesses in thermal stress and low mechanical strength, thereby maximizing 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形成されたエレメント本体と。The element body is made of oxide-based superconducting material.
このエレメント本体に充填されたカーボン繊維とで構成
されている。The element body is filled with carbon fiber.
（作 用） エレメント本体に充填されたカーボン繊維は。(for production) The carbon fiber filled in the element body.
熱処理工程に悪影響を与えることなく補強材として機能
し、熱応力を緩和してクラックの発生を抑制する。また
冷却時にも同様に補強材としての機能を確実に発揮する
。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
ことが可能となり、また機械的強度の向上化も可能とな
る。It functions as a reinforcing material without adversely affecting the heat treatment process, alleviating thermal stress and suppressing the occurrence of cracks. It also reliably functions as a reinforcing material during cooling. Therefore, it is possible to prevent the element body from cracking due to thermal stress, it is possible to exhibit a good magnetic shielding function, and it is also possible to improve mechanical strength.
（実施例） 以下１図面を参照しながら実施例を説明する。(Example) An embodiment will be described below with reference to one drawing.
第１図は本発明に係る磁気シールド用エレメントを一部
切欠して示すものである。このエレメントは、板状に形
成されたエレメント本体１と、このエレメント本体１内
に充填されたカーボン製の短繊維２とで構成されている
。FIG. 1 shows a partially cutaway view of a magnetic shielding element according to the present invention. This element is composed of an element body 1 formed into a plate shape and short carbon fibers 2 filled in the element body 1.
工・レメント本体１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、前記短繊維２は前記粉末の混合物を得るときに添
加されている。In this embodiment, the engineering element body 1 is made by forming 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 expanding and applying compressive force to form a dense plate, this plate was heat-treated in an oxygen atmosphere to synthesize an oxide-based superconductor layer. And the short fibers 2 are added when obtaining the powder mixture.
このような構成であると、エレメント本体１に充填され
たカーボン製の短繊維２が補強材として機能し、熱処理
時に生じる応力を緩和させる。この作用は冷却時も同じ
である。したがって、蔦応力が原因してエレメント本体
１にクラックが発生するのを確実に防止でき、良好な磁
気シールド機能を発揮させることができる。また、得ら
れたエレメントは短繊維２の存在によって機械的強度が
高いので、結果的に全体を薄肉化、軽量化することがで
き、扱い易いものを得ることができる。With such a configuration, the short carbon fibers 2 filled in the element main body 1 function as a reinforcing material and relieve stress generated during heat treatment. This effect is the same during cooling. Therefore, generation of cracks in the element body 1 due to the ivy stress can be reliably prevented, and a good magnetic shielding function can be exhibited. Further, the obtained element has high mechanical strength due to the presence of the short fibers 2, so that the entire element can be made thinner and lighter, and an element that is easier to handle can be obtained.
第２図は本発明の別の実施例に係るエレメントを一部切
欠して示すものである。FIG. 2 shows a partially cutaway view of an element according to another embodiment of the invention.
この実施例に係るエレメントは、酸化物系超電導材で円
筒状に形成されたエレメント本体１ａと。The element according to this embodiment has an element main body 1a formed in a cylindrical shape from an oxide-based superconducting material.
このエレメント本体ｌａ内に充填されたカボーン製の粗
目のテープ３とで構成されている。It is composed of a coarse-grained tape 3 made of carbon fiber filled in the element main body la.
すなわち、このエレメントは酸化物系超電導体を合成し
得る原料を有機溶剤によって溶解させて得られた溶液（
スラリー）をテープ３に付着させながら、このテープ３
を巻芯に重ね巻し、続いて巻芯を抜き取った状態で乾燥
させて有機溶剤を蒸発させ、その後に酸素雰囲気中で熱
処理を施して酸化物系超電導材内に超電導体を合成させ
たものとなっている。In other words, this element is a solution (
While adhering the slurry) to tape 3,
is wound around a core, then dried with the core removed to evaporate the organic solvent, and then heat-treated in an oxygen atmosphere to synthesize superconductors within the oxide-based superconducting material. It becomes.
このような構成であっても、カーボン製のテープ３が熱
応力を緩和させる機能と機械的強度を確保する機、能と
を発揮するので前記実施例と同様な効果が得られる。Even with such a configuration, the carbon tape 3 exhibits the function of alleviating thermal stress and the function of ensuring mechanical strength, so that the same effects as in the embodiment described above can be obtained.
第３図は本発明のさらに別の実施例を示すものである。FIG. 3 shows yet another embodiment of the invention.
この実施例は、カーボン製のテープに代えてカーボン製
の糸４を組み込んだ例である。このように構成しても前
記実施例と同様の効果を得ることができる。This embodiment is an example in which a carbon thread 4 is incorporated instead of a carbon tape. Even with this configuration, it is possible to obtain the same effects as in the above embodiment.
なお１本発明は上記各実施例に限定されるものではない
。すなわち、エレメント本体を構成する原料は酸化物系
超電導体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。また、カーボン繊
維として粗目のシートを用いてもよく、さらにはクォー
ツ繊維もしくはそのテープ、粗目のシート等でも同様の
効果が得られる。Note that the present invention is not limited to the above embodiments. That is, the raw material constituting the element body may be any material that can synthesize an oxide-based superconductor, and is not limited to yttrium-based materials. Further, a coarse sheet may be used as the carbon fiber, and the same effect can be obtained by using quartz fiber, a tape thereof, a coarse sheet, or the like.
〔発明の効果コ
以上述べたように１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
能を発揮するとともに機械的強度性に富んだ磁気シール
ド用エレメントを提供できる。[Effects of the Invention] As described above, the present invention provides a magnetic shielding element that can prevent cracks from occurring due to thermal stress, exhibits a good magnetic shielding function, and has high mechanical strength. can be provided.
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
ントを一部切欠して示す斜視図、第２図および第３図は
本発明のそれぞれ異なる実施例に係るは磁気シールド用
エレメントを一部切欠して示す側面図である。
１．１ａ・・・酸化物系超電導材で形成されたエレメン
ト本体、２・・・カーボン製の短繊維、３・・・カーボ
ン製のテープ、４・・・カーボン製の糸。
出願人代理人 弁理士 鈴江武彦FIG. 1 is a partially cutaway perspective view of a magnetic shielding element according to an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing magnetic shielding elements according to different embodiments of the present invention. FIG. 3 is a partially cutaway side view. 1.1a... Element main body formed of oxide superconducting material, 2... Carbon short fibers, 3... Carbon tape, 4... Carbon thread. Applicant's agent Patent attorney Takehiko Suzue
Claims (3)
，このエレメント本体内に充填されたカーボン繊維もし
くはクオーツ繊維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 made of an oxide superconducting material and carbon fiber or quartz fiber filled 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.
テープ状，シート状の何れかに形成されていることを特
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。(3) The carbon fiber and quartz fiber are filamentous,
The magnetic shielding element according to claim 1, wherein the magnetic shielding element is formed in either a tape shape or a sheet shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320445A JPH01161900A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320445A JPH01161900A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01161900A true JPH01161900A (en) | 1989-06-26 |
Family
ID=18121530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62320445A Pending JPH01161900A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01161900A (en) |
-
1987
- 1987-12-18 JP JP62320445A patent/JPH01161900A/en active Pending
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