JPH01161897A - Element for magnetic shielding - Google Patents
Element for magnetic shieldingInfo
- Publication number
- JPH01161897A JPH01161897A JP62320442A JP32044287A JPH01161897A JP H01161897 A JPH01161897 A JP H01161897A JP 62320442 A JP62320442 A JP 62320442A JP 32044287 A JP32044287 A JP 32044287A JP H01161897 A JPH01161897 A JP H01161897A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- retaining body
- superconducting material
- magnetic shielding
- lattice
- 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 35
- 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 10
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000002887 superconductor Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003960 organic solvent Substances 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 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
- 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
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 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
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 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
- 238000000034 method 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
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２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 shield device is constructed using oxide-based superconducting materials, manufacturing costs can be reduced compared to when a magnetic shield device is constructed using two-alloy 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.
アルミナで格子状に形成された支持体と、この支持体の
一方の表面に上記支持体の格子枠に沿って埋め込まれた
酸化物系超電導材とで構成されている。It is composed of a support formed of alumina in a lattice shape, and an oxide-based superconducting material embedded in one surface of the support along the lattice frame of the support.
（作 用）
酸化物系超電導材を格子枠に沿って埋設しているので、
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小さくできる
。加えて、支持体も格子状に形成されているので体積が
小さい。しかも。(Function) Since the oxide-based superconducting material is buried along the lattice frame,
The volume of the oxide superconducting material can be made smaller compared to the case where the element is formed by expanding the oxide superconducting material into a plate shape. In addition, since the support is also formed in a lattice shape, the volume is small. Moreover.
アルミナは熱収縮率が酸化物系超電導材のそれに近い。The thermal shrinkage rate of alumina is close to that of oxide-based superconducting materials.
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、また支持
体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。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 the presence of the support also makes it 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、アルミナで
形成された支持体１と、この支持体１の一方の表面に埋
め込まれた酸化物系超電導材２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 1 made of alumina and an oxide superconducting material 2 embedded in one surface of the support 1.
支持体１は、格子板状に形成されている。そして、支持
体１の一方の面には第２図に示すように格子枠３に沿い
、かつ全体が通じる関係に溝４が設けられている。そし
て、上記溝４内に前記酸化物系超電導材２が充填されて
いる。酸化物系超電導材２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）を溝４内に充填し、この状態で乾燥させて有機溶剤
を蒸発させた後、支持体１ごと酸素雰囲気中に入れて熱
処理を施し、酸化物系超電導体層を合成させたものとな
っている。The support body 1 is formed in the shape of a grid plate. As shown in FIG. 2, a groove 4 is provided on one surface of the support 1 along the lattice frame 3 and in a relationship that communicates with the entire surface. The groove 4 is filled with the oxide superconducting material 2. In this example, the oxide-based superconducting material 2 is made by mixing a mixture of yttrium oxide powder, barium carbonate powder, and copper oxide powder in a molar ratio of 0.5:1.0:3.0 with an organic solvent. The solution (slurry) obtained by dissolving with It is a composite of superconductor layers.
このような構成であると、酸化物系超電導材２が格子枠
３に沿って埋設されているので、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小さくできる。また、支持体１も格
子状に形成されているので体積が小さい。しかも、アル
ミナは熱収縮率が酸化物系超電導材２のそれに近い。し
たがって、熱処理時および冷却時に酸化物系超電導材２
に発生する熱応力を緩和でき、クラックの発生を抑制す
ることができる。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、支特休１の存在によっ
てエレメントの機械的強度も向上させることができる。With this configuration, since the oxide-based superconducting material 2 is buried along the lattice frame 3, the oxide-based superconducting material 2 is buried along the lattice frame 3. The volume of superconducting material can be reduced. Further, since the support body 1 is also formed in a lattice shape, its volume is small. Moreover, alumina has a thermal shrinkage rate close to that of the oxide-based superconducting material 2. Therefore, during heat treatment and cooling, the oxide-based superconducting material 2
The thermal stress generated in the process can be alleviated, and the occurrence of cracks can be suppressed. As a result, a good magnetic shielding function can be exhibited. Moreover, the mechanical strength of the element can also be improved due to the existence of the special holiday 1.
第３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. 3 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１ａが格子を持
つとともに円筒状に形成されている。そして、支持体１
ａの外面に格子枠３に沿い、かつ全体が通じる関係に溝
４が設けてあり、この溝４に酸化物系超電導材２が充填
されている。In the element according to this embodiment, the support 1a has a grid and is formed in a cylindrical shape. And support 1
A groove 4 is provided on the outer surface of the lattice frame 3 along the lattice frame 3 so as to communicate with the entire lattice frame 3, and this groove 4 is filled with an oxide-based superconducting material 2.
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、支持体を
構成するアルミナは。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. Also, the alumina that makes up the support.
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
。It is preferable that the thermal contraction rate is 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
ド用エレメントを提供できる。[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. 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・・・アルミナ製の支持体、２・・・酸化物系
Ｌ：電導材、３・・・格子枠、４・・・溝。
出願人代理人 弁理士 鈴江武彦
第２図
第３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. 1.1a... Support made of alumina, 2... Oxide-based L: conductive material, 3... Grid frame, 4... Groove. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3
Claims (3)
持体の一方の表面に上記支持体の格子枠に沿って埋め込
まれた酸化物系超電導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 body formed of alumina in a lattice shape, and an oxide-based superconducting material embedded in one surface of the support body along the lattice frame of the support body. Magnetic shielding element.
−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.
熱収縮率を有するアルミナで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 magnetic shielding element according to claim 1, wherein the support is made of alumina having a thermal shrinkage rate comparable to that of the oxide superconducting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320442A JPH01161897A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62320442A JPH01161897A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01161897A true JPH01161897A (en) | 1989-06-26 |
Family
ID=18121495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62320442A Pending JPH01161897A (en) | 1987-12-18 | 1987-12-18 | Element for magnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01161897A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008160027A (en) * | 2006-12-26 | 2008-07-10 | Takenaka Komuten Co Ltd | Magnetic shielding body and magnetic shielding room |
| WO2009066422A1 (en) * | 2007-11-19 | 2009-05-28 | Takenaka Corporation | Magnetic shield body and magnetic shield room |
-
1987
- 1987-12-18 JP JP62320442A patent/JPH01161897A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008160027A (en) * | 2006-12-26 | 2008-07-10 | Takenaka Komuten Co Ltd | Magnetic shielding body and magnetic shielding room |
| WO2009066422A1 (en) * | 2007-11-19 | 2009-05-28 | Takenaka Corporation | Magnetic shield body and magnetic shield room |
| US8531185B2 (en) | 2007-11-19 | 2013-09-10 | Takenaka Corporation | Magnetic shield body and magnetic shielded room |
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