JPH01161899A - Element for magnetic shielding - Google Patents
Element for magnetic shieldingInfo
- Publication number
- JPH01161899A JPH01161899A JP62320444A JP32044487A JPH01161899A JP H01161899 A JPH01161899 A JP H01161899A JP 62320444 A JP62320444 A JP 62320444A JP 32044487 A JP32044487 A JP 32044487A JP H01161899 A JPH01161899 A JP H01161899A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- magnetic shielding
- coating layer
- superconducting
- alumina spray
- 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 33
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 10
- 239000004917 carbon fiber Substances 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002887 superconductor Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000007769 metal material Substances 0.000 claims description 2
- 230000008646 thermal stress Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 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
- 239000003960 organic solvent Substances 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 4
- 229910001220 stainless steel 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
- 239000011247 coating layer Substances 0.000 abstract 5
- 238000005507 spraying Methods 0.000 abstract 5
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 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
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001035 drying 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
- 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、酸化物系超電導材を用いたエレメントに関する。In particular, it relates to elements using oxide-based superconducting materials.
（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. This allows maintenance costs to 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 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.
金属材の表面にアルミナ溶射層を設けてなる支持体と、
カーボン繊維系に酸化物系超電導材を担持させて構成さ
れ前記支持体の前記アルミナ溶射層の表面に格子状に固
定された超電導線材とで構成されている。A support formed by providing an alumina sprayed layer on the surface of a metal material,
The superconducting wire is composed of carbon fibers supporting an oxide superconducting material and is fixed to the surface of the alumina sprayed layer of the support in a lattice pattern.
（作 用）
前記構成の超電導線材を支持体の表面に格子状に配置し
て磁気遮蔽部を構成しているので、酸化物系超電導材を
板状に展開してエレメントを構成した場合に比べて酸化
物系超電導材の体積を大幅に小さくできる。加えて、ア
ルミナ溶射層は熱収縮率が酸化物系超電導材のそれに近
い。さらに。(Function) Since the magnetic shielding section is constructed by arranging the superconducting wires having the above structure in a lattice pattern on the surface of the support, the magnetic shielding part is more compact than when the element is constructed by expanding the oxide-based superconducting material into a plate shape. As a result, the volume of the oxide-based superconducting material can be significantly reduced. In addition, the alumina sprayed layer has a thermal shrinkage rate close to that of oxide-based superconducting materials. moreover.
カーボン繊維系は酸化物系超電導材に発生する熱応力を
緩和させる。したがって、熱処理時および冷却時の熱応
力が緩和され、クラックの発生が抑制される。この結果
、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、またカーボン繊維系の存在によって機械的強度の向
上も図ることが可能となる。Carbon fiber-based materials alleviate thermal stress generated in oxide-based superconducting materials. Therefore, thermal stress during heat treatment and cooling is relaxed, and the occurrence of cracks is suppressed. As a result, it becomes possible to exhibit a good magnetic shielding function, and it is also possible to improve mechanical strength due to the presence of the carbon fiber system.
（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図は本発明の一実施例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、薄いステン
レス鋼板１の一方の面にアルミナ溶射層２を設けてなる
支持体３と、この支持体３のアルミナ溶射層２の表面に
格子状に固定された超電導線材４とで構成されている。FIG. 1 shows a magnetic shielding element according to an embodiment of the present invention. This element is composed of a support 3 formed by providing an alumina sprayed layer 2 on one side of a thin stainless steel plate 1, and superconducting wires 4 fixed in a grid pattern to the surface of the alumina sprayed layer 2 of the support 3. has been done.
超電導線材４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
有機溶剤で溶解して得られた溶液（スラリー）を第２図
に示すようにカーボン繊維系５に担持させ、これをアル
ミナ溶射層２の表面に格子状に配設し、この状態で乾燥
させて有機溶剤を蒸発させた後、支持体３ごと酸素雰囲
気中に入れて熱処理を施し、酸化物系超電導材６中に酸
化物系化合物超電導体層を合成させたものとなっている
。In this embodiment, the superconducting wire 4 contains yttrium oxide powder, barium carbonate powder, and copper oxide powder in a molar ratio of 0.
A solution (slurry) obtained by dissolving a mixture in a ratio of 5:1.0:3.0 with an organic solvent is supported on a carbon fiber system 5 as shown in FIG. After drying in this state to evaporate the organic solvent, the support 3 is placed in an oxygen atmosphere and subjected to heat treatment. It is a composite of compound superconductor layers.
なお、第２図中７はエポキシ樹脂層を示している。Note that 7 in FIG. 2 indicates an epoxy resin layer.
このような構成であると、超電導線材４を支持・体３の
表面に格子状に配置して磁気遮蔽部を構成しているので
、酸化物系超電導材を板状に展開してエレメントを構成
した場合に比べて酸化物系超電導材６の体積を大幅に小
さくできる。また、隣接するアルミナ溶射層２は熱収縮
率が酸化物系超電導材６のそれに近い。また、カーボン
繊維系５は線状の酸化物系超電導材６に発生する熱応力
を緩和させる。したがって、熱処理時および冷却時の熱
応力が緩和され、クラックの発生が抑制される。この結
果、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、カーボン繊維系５の存在によって超電導線材４
の機械的強度も向上させることができる。With this configuration, the superconducting wires 4 are arranged in a lattice pattern on the surface of the support/body 3 to constitute the magnetic shielding part, so the oxide-based superconducting material is expanded into a plate shape to constitute the element. The volume of the oxide-based superconducting material 6 can be significantly reduced compared to the case where the oxide superconducting material 6 is made small. Further, the thermal shrinkage rate of the adjacent alumina sprayed layer 2 is close to that of the oxide-based superconducting material 6. Furthermore, the carbon fiber system 5 relieves thermal stress generated in the linear oxide superconducting material 6. Therefore, thermal stress during heat treatment and cooling is relaxed, and the occurrence of cracks is suppressed. As a result, a good magnetic shielding function can be exhibited. In addition, due to the presence of carbon fiber system 5, superconducting wire 4
The mechanical strength of can also be improved.
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、支持体３ａがステンレ
ス鋼板によって形成された円筒体１１と。The element according to this embodiment has a cylindrical body 11 in which the support body 3a is formed of a stainless steel plate.
この円筒体１１の外面に形成されたアルミナ溶射層１２
とで構成されている。そして、アルミナ溶射層１２の外
面に前記実施例と同様に構成された超電導線材４が格子
状に固定されている。Alumina sprayed layer 12 formed on the outer surface of this cylindrical body 11
It is made up of. Superconducting wires 4 configured in the same manner as in the above embodiment are fixed to the outer surface of the alumina sprayed layer 12 in a grid pattern.
このように構成しても前記実施例と同様の効果を発揮さ
せることができる。Even with this configuration, the same effects as in the embodiment described above can be achieved.
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、酸化物系超電導材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、アルミナ
溶射層は、酸化物系超電導材の熱収縮率に限りなく近い
程好ましい。Note that the present invention is not limited to the above embodiments. That is, the raw material constituting the oxide-based superconducting material may be any material that can synthesize an oxide-based superconductor, and is not limited to yttrium-based materials. Further, it is preferable that the alumina sprayed layer has a thermal contraction rate as close as possible to that of the oxide-based superconducting material.
［発明の効果］
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
ド用エレメント今提供できる。[Effects of the Invention] As described above, according to the present invention, there is provided 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. I can offer it now.
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図は同エレメントの局部的断面図、
第３図は本発明の別の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・・・ステンレス鋼板、２．１２・・・アルミナ溶射
層。
３．３ａ・・・支持体、４・・・超電導線材、５・・・
カーボン繊維系、６・・・酸化物系超電導材、７・・・
エポキシ樹脂層、１１・・・円筒体。
出願人代理人 弁理士 鈴江武彦
−へ８３
第６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 local sectional view of the element.
FIG. 3 is a partially cutaway side view of a magnetic shielding element according to another embodiment of the present invention. 1... Stainless steel plate, 2.12... Alumina sprayed layer. 3.3a...Support, 4...Superconducting wire, 5...
Carbon fiber-based, 6... Oxide-based superconducting material, 7...
Epoxy resin layer, 11... Cylindrical body. Applicant's agent Patent attorney Takehiko Suzue 83 Figure 6
Claims (2)
体と，カーボン繊維系に酸化物系超電導材を担持させて
構成され前記支持体の前記アルミナ溶射層の表面に格子
状に固定された超電導線材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 support formed by providing an alumina sprayed layer on the surface of a metal material, and a carbon fiber-based oxide superconducting material supported on the surface of the alumina sprayed layer of the support, which is fixed in a lattice pattern. A magnetic shielding element characterized by comprising a superconducting wire and a superconducting wire.
−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 |
|---|---|---|---|
| JP62320444A JPH01161899A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320444A JPH01161899A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01161899A true JPH01161899A (en) | 1989-06-26 |
Family
ID=18121520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62320444A Pending JPH01161899A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01161899A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5192191A (en) * | 1990-05-28 | 1993-03-09 | Sanshin Kogyo Kabushiki Kaisha | Propeller vane structure for marine propulsion unit |
| JP2015115125A (en) * | 2013-12-10 | 2015-06-22 | 矢崎総業株式会社 | Shield sleeve and electric wire with shield |
-
1987
- 1987-12-18 JP JP62320444A patent/JPH01161899A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5192191A (en) * | 1990-05-28 | 1993-03-09 | Sanshin Kogyo Kabushiki Kaisha | Propeller vane structure for marine propulsion unit |
| JP2015115125A (en) * | 2013-12-10 | 2015-06-22 | 矢崎総業株式会社 | Shield sleeve and electric wire with shield |
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