JP2014165382A - Superconducting bulk magnet - Google Patents
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Abstract
Description
本発明は、超電導バルク体を利用した超電導バルク磁石に関する。 The present invention relates to a superconducting bulk magnet using a superconducting bulk body.
RE1Ba2Cu3Oy（REはY又は希土類元素から選ばれる１種又は２種以上の元素。ｙは酸素量で、６．８≦ｙ≦７．１）中にRE2BaCuO5が微細分散した超電導バルク体は、強いピン止め力を有しているので、従来の永久磁石に比べて非常に強力な磁場発生源になりうる。このような超電導バルク体を利用した磁場発生源は超電導バルク磁石と呼ばれている。超電導バルク磁石には、コンパクトで強磁場、高い磁場勾配という優れた特長があり、磁気分離を始め、船舶用モータや風力発電用発電機などの磁石を利用する応用において、これらの機器を大幅に小型軽量化するものとして期待されている。
(In RE is one or more elements .y is oxygen are selected from Y or a rare earth element, 6.8 ≦ y ≦ 7.1) RE 1
磁性体に作用する磁気力は、単純には磁場強度と磁場勾配との積に比例する。個々の超電導バルク体の磁場分布は中央部の磁場強度が高くなっているため、高い磁場勾配を有している。従って、超電導バルク体を利用すれば、コンパクトで磁気力の強い磁石を構成することができる。特に、複数個の超電導バルク体を並べて配置することにより超電導バルク磁石を構成すると、高い磁場勾配を有して空間的に周期性がある磁場を発生させることができるため、超電導バルク体の強い磁気力を有効に利用できる。ここで複数個の超電導バルク体を並べて配置したものを超電導バルク集合体と呼ぶことにする。複数個の超電導バルク体を並べて配置した超電導バルク集合体を用いて超電導バルク磁石を構成することは、例えば、特許文献１に提案されている。特許文献１には、立方体や直方体等の多角柱体形状の複数個の超電導バルク体をエポキシ樹脂等の接着剤で接着させて一体化させた超電導バルク集合体を用いて超電導バルク磁石を形成することが記載されている。 The magnetic force acting on the magnetic material is simply proportional to the product of the magnetic field strength and the magnetic field gradient. The magnetic field distribution of each superconducting bulk body has a high magnetic field gradient because the magnetic field strength at the center is high. Therefore, if a superconducting bulk body is used, a compact and strong magnet can be constructed. In particular, when a superconducting bulk magnet is formed by arranging a plurality of superconducting bulk bodies side by side, a magnetic field having a high magnetic field gradient and spatially periodicity can be generated. Power can be used effectively. Here, a structure in which a plurality of superconducting bulk bodies are arranged side by side is referred to as a superconducting bulk aggregate. For example, Patent Document 1 proposes that a superconducting bulk magnet is configured using a superconducting bulk assembly in which a plurality of superconducting bulk bodies are arranged side by side. In Patent Document 1, a superconducting bulk magnet is formed using a superconducting bulk assembly in which a plurality of superconducting bulk bodies having a polygonal column shape such as a cube or a rectangular parallelepiped are bonded and integrated with an adhesive such as an epoxy resin. It is described.
上述したように、複数個の超電導バルク体を並べて配置した超電導バルク集合体を用いて超電導バルク磁石を構成すれば、高い磁場勾配を有して空間的に周期性がある磁場を発生させることができる。ところが、超電導体は低温に冷却してクライオスタット等の冷却容器内に収納されて用いられるため、冷却容器の隔壁を介しても強い磁気力が得られるように、より磁気力の強い超電導バルク磁石が求められている。しかしながら、特許文献１に記載されているような、立方体や直方体等の多角柱体形状の複数個の超電導バルク体を単に縦や横に配置した超電導バルク集合体を用いただけでは、エポキシ樹脂等で一体化しても個々の超電導バルク体間に超電導電流が流れるわけではなく、隣り合う超電導バルク体の間では磁場強度がゼロになっているため、磁気力の更なる向上は難しいという問題があった。 As described above, if a superconducting bulk magnet is configured using a superconducting bulk assembly in which a plurality of superconducting bulk bodies are arranged side by side, a magnetic field having a high magnetic field gradient and spatial periodicity can be generated. it can. However, since the superconductor is cooled to a low temperature and stored in a cooling container such as a cryostat, a superconducting bulk magnet having a stronger magnetic force is used so that a strong magnetic force can be obtained even through the partition wall of the cooling container. It has been demanded. However, only using a superconducting bulk assembly in which a plurality of superconducting bulk bodies having a polygonal column shape such as a cube or a rectangular parallelepiped, as described in Patent Document 1, are used in a vertical or horizontal manner can be used. Even if they are integrated, the superconducting current does not flow between the individual superconducting bulk bodies, and the magnetic field strength is zero between the adjacent superconducting bulk bodies, which makes it difficult to further improve the magnetic force. .
そこで、本発明では、上記の問題を解決し、複数個の超電導バルク体からなる超電導バルク集合体を利用した超電導バルク磁石において、磁気力の大きい超電導バルク磁石を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems and provide a superconducting bulk magnet having a large magnetic force in a superconducting bulk magnet using a superconducting bulk assembly composed of a plurality of superconducting bulk bodies.
本発明の超電導バルク体を利用した超電導バルク磁石は、以下のとおりである。
（１）複数個の超電導バルク体から構成される第一の超電導バルク体、及び前記第一の超電導バルク体の外周を取り囲む中空状の第二の超電導バルク体からなる超電導バルク磁石であって、前記第一の超電導バルク体は中空状でない複数の超電導バルク体を所定の方向に並べて配置して面状に組み合わせた超電導バルク集合体構造であり、前記第二の超電導バルク体は一体構造であることを特徴とする超電導バルク磁石。
（２）前記第一の超電導バルク体、または前記第一の超電導バルク体及び前記第二の超電導バルク体を構成する超電導バルク体が、RE1Ba2Cu3Oy（REはY又は希土類元素から選ばれる１種又は２種以上の元素。ｙは酸素量で、６．８≦ｙ≦７．１）中にRE2BaCuO5が微細分散した超電導体であることを特徴とする（１）記載の超電導バルク磁石。
（３）前記第一の超電導バルク体を構成する超電導バルク体が、RE1Ba2Cu3Oy（REはY又は希土類元素から選ばれる１種又は２種以上の元素。ｙは酸素量で、６．８≦ｙ≦７．１）中にRE2BaCuO5が微細分散した超電導体であり、前記第二の超電導バルク体がMgとBとからなる超電導バルク体であることを特徴とする（１）記載の超電導バルク磁石。
（４）前記第一の超電導バルク体を構成する複数の超電導バルク体の間、及び前記第一の超電導バルク体と前記第二の超電導バルク体との間に、低融点金属層、樹脂層、又はグリース層からなる緩衝層が設けられていることを特徴とする（１）〜（３）のいずれか１つに記載の超電導バルク磁石。
The superconducting bulk magnet using the superconducting bulk body of the present invention is as follows.
(1) A superconducting bulk magnet composed of a first superconducting bulk body composed of a plurality of superconducting bulk bodies, and a hollow second superconducting bulk body surrounding the outer periphery of the first superconducting bulk body, The first superconducting bulk body is a superconducting bulk assembly structure in which a plurality of non-hollow superconducting bulk bodies are arranged in a predetermined direction and combined in a planar shape, and the second superconducting bulk body is a monolithic structure. A superconducting bulk magnet.
(2) The first superconducting bulk body or the superconducting bulk body constituting the first superconducting bulk body and the second superconducting bulk body is RE 1 Ba 2 Cu 3 O y (RE is Y or a rare earth element) One or two or more elements selected from the above, wherein y is the amount of oxygen and is a superconductor in which RE 2 BaCuO 5 is finely dispersed in (6.8 ≦ y ≦ 7.1) (1) The superconducting bulk magnet described.
(3) The superconducting bulk body constituting the first superconducting bulk body is RE 1 Ba 2 Cu 3 O y (RE is one or more elements selected from Y or rare earth elements. Y is the amount of oxygen. 6.8 ≦ y ≦ 7.1) in which RE 2 BaCuO 5 is finely dispersed, and the second superconducting bulk body is a superconducting bulk body composed of Mg and B. (1) The superconducting bulk magnet according to (1).
(4) A low-melting point metal layer, a resin layer, between the plurality of superconducting bulk bodies constituting the first superconducting bulk body, and between the first superconducting bulk body and the second superconducting bulk body, Or the buffer layer which consists of a grease layer is provided, The superconducting bulk magnet as described in any one of (1)-(3) characterized by the above-mentioned.
本発明により、複数個の超電導バルク体からなる超電導バルク集合体を利用した超電導バルク磁石において、磁気力の大きい超電導バルク磁石を提供することができる。 According to the present invention, a superconducting bulk magnet using a superconducting bulk assembly composed of a plurality of superconducting bulk bodies can provide a superconducting bulk magnet having a large magnetic force.
以下に、本発明の実施形態について、図に沿って説明する。
図１は、本実施形態における超電導バルク磁石の一例を示す概念図である。図１は、中空状でない四角形状の超電導バルク体１が複数個並べられて構成された第一の超電導バルク体２の外周を第二の超電導バルク体３が取り囲む構成となっている。比較のため、図２に従来技術の一例を示す。図２に示す例も、四角形状の超電導バルク体１０が複数個並べられて超電導バルク集合体を構成しているが、その外周を取り囲む第二の超電導バルク体がない。なお、図１及び図２に示す例では、超電導バルク体を収納する容器や冷却システム等は省略されている。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a conceptual diagram showing an example of a superconducting bulk magnet in the present embodiment. FIG. 1 shows a configuration in which a second
図３は、図１及び図２に示した超電導バルク磁石の表面での磁場分布の概念図である。個々の超電導バルク体の磁場分布は中央部の磁場強度が大きく、高い磁場勾配を有しているため、超電導バルク体を複数個並べて配置して超電導バルク集合体とすることにより、高い磁場勾配を有して空間的に周期性がある磁場を発生させることができる。しかし、図２に示す従来技術の場合、その磁場分布は図３（ａ）に示すように、高い磁場勾配は有しているものの、隣り合う超電導バルク体との間では磁場強度がゼロになる。それは、図２に示すように個々の超電導バルク体１０をエポキシ樹脂等で一体化して配置して超電導バルク集合体としただけでは、隣り合う超電導バルク体間には超電導電流が流れないためである。
FIG. 3 is a conceptual diagram of the magnetic field distribution on the surface of the superconducting bulk magnet shown in FIGS. 1 and 2. Since the magnetic field distribution of each superconducting bulk body has a large magnetic field strength in the center and a high magnetic field gradient, a plurality of superconducting bulk bodies are arranged side by side to form a superconducting bulk assembly. A magnetic field having spatial periodicity can be generated. However, in the case of the prior art shown in FIG. 2, the magnetic field distribution has a high magnetic field gradient as shown in FIG. 3A, but the magnetic field strength becomes zero between adjacent superconducting bulk bodies. . This is because a superconducting current does not flow between adjacent superconducting bulk bodies simply by arranging and arranging individual
一方、本実施形態の場合、複数個の超電導バルク体１からなる第一の超電導バルク体２を構成する隣り合う超電導バルク体間には超電導電流が流れないものの、第一の超電導バルク体２の外周を取り囲むように第二の超電導バルク体３が存在するため、その磁場分布は図３（ｂ）に示すように、ほぼ同じような磁場勾配を有しつつ磁場分布全体が上方にシフトした磁場分布になっている。すなわち、第二の超電導バルク体３は、複数個の超電導バルク体１からなる第一の超電導バルク体２から発生する磁場分布を嵩上げする機能を有する。そのため、磁場強度と磁場勾配との積で表わされる磁気力において、磁場勾配は図１及び図２に示す例ではほぼ同じであるが、全体的な磁場強度が高いため、本実施形態である図１に示す構成の超電導バルク磁石においては、その磁気力が格段に大きくなる。なお、第二の超電導バルク体３の大きさは、嵩上げしたい磁場の大きさや冷却温度に応じて決められる。
On the other hand, in the case of the present embodiment, although the superconducting current does not flow between adjacent superconducting bulk bodies constituting the first
図３（ｂ）に示すような磁場分布は、図２に示す従来技術の超電導バルク磁石に、電磁石や超電導コイルを用いた超電導磁石による外部磁場を組み合わせることでも可能であるが、電磁石や超電導コイルを用いた超電導磁石と組み合わせるとコンパクトで強磁場という超電導バルク磁石の優れた特長を損なうので好ましくない。本実施形態の場合、第二の超電導バルク体３が、電磁石や超電導コイルを用いた超電導磁石による外部磁場を印加することと同じ機能を有しているため、コンパクトで強磁場という超電導バルク磁石の優れた特長を損なうことなく超電導バルク磁石の磁気力を高めることができる。
The magnetic field distribution as shown in FIG. 3B can be obtained by combining the superconducting bulk magnet of the prior art shown in FIG. 2 with an external magnetic field by a superconducting magnet using an electromagnet or a superconducting coil. When combined with a superconducting magnet using a magnet, the excellent features of a superconducting bulk magnet such as a compact and strong magnetic field are impaired. In the case of the present embodiment, the second
本発明に用いられる第一の超電導バルク体を構成する超電導バルク体としては、単結晶状のRE1Ba2Cu3Oy（REはY又は希土類元素から選ばれる１種又は２種以上の元素。ｙは酸素量で、６．８≦ｙ≦７．１）中にRE2BaCuO5が微細分散した酸化物超電導バルク体が、強いピン止め力を有しており、捕捉磁場特性が優れているため好ましい。本発明に用いられる第二の超電導バルク体としても、RE1Ba2Cu3Oy中にRE2BaCuO5が微細分散した酸化物超電導バルク体が好ましい。しかし、第二の超電導バルク体には、第一の超電導バルク体により発生する磁場分布を嵩上げする機能が求められるので、第二の超電導バルク体は、複数個の超電導バルク体からなる第一の超電導バルク体のように複数個の超電導バルク体をエポキシ等で一体化したものではなく、第二の超電導バルク体全体に超電導電流が流れるようにする必要があり、一体構造の超電導バルク体とする。 As the superconducting bulk body constituting the first superconducting bulk body used in the present invention, single crystalline RE 1 Ba 2 Cu 3 O y (RE is Y or one or more elements selected from rare earth elements) Y is the amount of oxygen, and the oxide superconducting bulk material in which RE 2 BaCuO 5 is finely dispersed in 6.8 ≦ y ≦ 7.1) has a strong pinning force and excellent trapping magnetic field characteristics. Therefore, it is preferable. As the second superconducting bulk material used in the present invention, an oxide superconducting bulk material in which RE 2 BaCuO 5 is finely dispersed in RE 1 Ba 2 Cu 3 O y is preferable. However, since the second superconducting bulk body is required to have a function of increasing the magnetic field distribution generated by the first superconducting bulk body, the second superconducting bulk body is composed of a plurality of superconducting bulk bodies. A superconducting bulk body is not an integrated superconducting bulk body made of epoxy or the like, but a superconducting current must flow through the entire second superconducting bulk body. .
一方、RE1Ba2Cu3Oy中にRE2BaCuO5が微細分散した酸化物超電導バルク体は、高い捕捉磁場特性を発揮させるには全体を単結晶状にする必要があるが、単結晶状の大きな超電導バルク体を一体構造で製造するのは困難であるため、大型の超電導バルク磁石である第二の超電導バルク体に適用することは難しい。このことから大型の超電導バルク磁石である第二の超電導バルク体にはMgとBとからなる多結晶状MgB2の超電導バルク体を用いてもよい。RE1Ba2Cu3Oy中にRE2BaCuO5が微細分散した酸化物超電導バルク体の超電導転移温度（Ｔc）が９０Ｋ程度であるのに比べて、MgとBとからなる超電導バルク体（MgB2）の超電導転移温度（Ｔc）は４０Ｋ程度と低いものの、単結晶状ではなく多結晶状の超電導バルク体でも全体に超電導電流が流れる。多結晶状の超電導バルク体の製造は単結晶状の超電導バルク体の製造に比較して容易である。 On the other hand, an oxide superconducting bulk in which RE 2 BaCuO 5 is finely dispersed in RE 1 Ba 2 Cu 3 O y needs to be made into a single crystal as a whole in order to exhibit high trapping magnetic field characteristics. Since it is difficult to manufacture a large superconducting bulk body with a single structure, it is difficult to apply it to a second superconducting bulk body that is a large superconducting bulk magnet. Therefore, a polycrystalline MgB 2 superconducting bulk body composed of Mg and B may be used for the second superconducting bulk body which is a large superconducting bulk magnet. Compared to the superconducting transition temperature (T c ) of an oxide superconducting bulk in which RE 2 BaCuO 5 is finely dispersed in RE 1 Ba 2 Cu 3 O y , the superconducting bulk consists of Mg and B. Although the superconducting transition temperature (T c ) of (MgB 2 ) is as low as about 40 K, a superconducting current flows in the whole of a superconducting bulk material that is not a single crystal but a polycrystalline one. The production of a polycrystalline superconducting bulk body is easier than the production of a single crystalline superconducting bulk body.
第二の超電導バルク体がMgとBとからなる超電導バルク体である場合、その充填率は８０％以上であることが好ましい。ここで充填率とは、理論密度に対する実際の密度の比である。MgとBとからなる超電導バルク体は、一般的にはMg粉末とB粉末とを混合して成形したものを焼結して作製されるが、Mgの融点が６５０℃でBの融点が２０７６℃と大きく異なるため、MgがBに吸収される形で反応が進み、充填率が５０％程度と低くなる。充填率が低いMgとBとからなる超電導バルク体の機械的強度は極端に小さくなる。本発明の超電導バルク磁石では、第二の超電導バルク体は複数個の超電導バルク体からなる第一の超電導バルク体の外周を取り囲むように配置されるので、複数個の超電導バルク体からなる第一の超電導バルク体を構成する超電導バルク体同士の磁気的な反発力を第二の超電導バルク体が受けることになる。したがって、第二の超電導バルク体の機械的強度が極端に小さいと、第二の超電導バルク体の外周に補強リングを設けたとしても、第二の超電導バルク体が破損するおそれがある。このことから充填率が８０％以上であれば、MgとBとからなる超電導バルク体においても十分な機械的強度を得ることができる。充填率８０％以上のMgとBとからなる超電導バルク体を得るには、焼結中に圧力を加えることが有効な手段である。焼結中に圧力を加える手段としては、例えば、熱間等方圧加圧（ＨＩＰ）などがある。 When the second superconducting bulk body is a superconducting bulk body composed of Mg and B, the filling rate is preferably 80% or more. Here, the filling rate is the ratio of the actual density to the theoretical density. A superconducting bulk body composed of Mg and B is generally produced by sintering a mixture of Mg powder and B powder, and the melting point of Mg is 650 ° C. and the melting point of B is 2076. Since it is greatly different from ° C., the reaction proceeds in a form in which Mg is absorbed by B, and the filling rate becomes as low as about 50%. The mechanical strength of a superconducting bulk body composed of Mg and B with a low filling rate becomes extremely small. In the superconducting bulk magnet of the present invention, the second superconducting bulk body is disposed so as to surround the outer periphery of the first superconducting bulk body composed of a plurality of superconducting bulk bodies. The second superconducting bulk body receives the magnetic repulsion between the superconducting bulk bodies constituting the superconducting bulk body. Therefore, if the mechanical strength of the second superconducting bulk body is extremely small, the second superconducting bulk body may be damaged even if a reinforcing ring is provided on the outer periphery of the second superconducting bulk body. From this, if the filling rate is 80% or more, sufficient mechanical strength can be obtained even in a superconducting bulk body composed of Mg and B. In order to obtain a superconducting bulk body composed of Mg and B with a filling rate of 80% or more, it is an effective means to apply pressure during sintering. Examples of means for applying pressure during sintering include hot isostatic pressing (HIP).
本発明の超電導バルク磁石では、複数個の超電導バルク体からなる第一の超電導バルク体と第二の超電導バルク体とを組み合わせて超電導バルク磁石を構成するものであるが、個々の超電導バルク体間にはお互いの磁場による反発力が作用する。すなわち、隣り合う超電導バルク体は互いに反発力を及ぼしあっている。個々の超電導バルク体の加工精度が低いと、隣り合う超電導バルク体間の反発力が均一に伝わらず、超電導バルク体の一部に局所的な反発力が作用して破損する恐れがあるため、個々の超電導バルク体を精度よく加工する必要がある。そこで、図４に示すように、複数個の超電導バルク体１の間や、その外周を覆う第二の超電導バルク体３との間に、緩衝層４を設けてもよい。これにより、隣り合う超電導バルク体間の反発力をより均一に伝えることができ、超電導バルク体の破損を低減することができる。本発明に用いられる緩衝層としては、超電導バルク体よりも柔らかければよく、樹脂、低融点金属やグリース等のいずれかが好ましい。また、図４に示すように、複数個の超電導バルク体１を縦方向及び横方向に配置して第一の超電導バルク体を構成するようにしてもよい。さらに本実施形態では、四角形状の超電導バルク体を複数並べる例について説明したが、その他の多角形（三角形や六角形など）の超電導バルク体を複数並べてもよい。
In the superconducting bulk magnet of the present invention, a superconducting bulk magnet is configured by combining a first superconducting bulk body composed of a plurality of superconducting bulk bodies and a second superconducting bulk body. The repulsive force of each other's magnetic field acts on. That is, the adjacent superconducting bulk bodies are repelling each other. If the processing accuracy of each superconducting bulk body is low, the repulsive force between adjacent superconducting bulk bodies may not be transmitted uniformly, and local repulsive force may act on a part of the superconducting bulk body, causing damage. It is necessary to process each superconducting bulk body with high accuracy. Therefore, as shown in FIG. 4, a buffer layer 4 may be provided between the plurality of superconducting bulk bodies 1 and between the second
（実施例１）
Ptを０．５質量％およびAgを１０質量％含み、かつGd1Ba2Cu3Oy中に２５モル％のGd2BaCuO5が微細分散した一辺３０ｍｍ、高さ１５ｍｍの四角形状の超電導バルク体を３個並べて第一の超電導バルク体とし、その外周に外形１３０ｍｍ×７０ｍｍ、高さ１５ｍｍに９０ｍｍ×３０ｍｍの内穴を開けた、第一の超電導バルク体と同じ組成からなる第二の超電導バルク体１個を組み合わせて超電導バルク磁石を作製した。第一の超電導バルク体を構成する個々の超電導バルク体及び第二の超電導バルク体は、どちらも溶融結晶成長法で単結晶状に結晶成長させたバルク体から所定の形状に加工した。
Example 1
A rectangular superconducting bulk with a side of 30 mm and a height of 15 mm, containing 0.5% by mass of Pt and 10% by mass of Ag, and 25 mol% of Gd 2 BaCuO 5 finely dispersed in Gd 1 Ba 2 Cu 3 O y A second superconducting body having the same composition as the first superconducting bulk body, in which three bodies are arranged to form a first superconducting bulk body, and an outer hole of 130 mm × 70 mm and a height of 15 mm and an inner hole of 90 mm × 30 mm are formed on the outer periphery. A superconducting bulk magnet was fabricated by combining one bulk body. Each of the individual superconducting bulk body and the second superconducting bulk body constituting the first superconducting bulk body was processed into a predetermined shape from a bulk body crystal-grown into a single crystal by the melt crystal growth method.
この超電導バルク磁石の外周を肉厚５ｍｍのステンレス鋼のリングで補強した後、外部磁場３Ｔで磁場中冷却して着磁し、液体窒素中（７７Ｋ）で磁場分布を測定した。この超電導バルク磁石は、個々の第一の超電導バルク体の中央部の磁場強度が強くなる磁場分布を有し、隣り合う超電導バルク体の間の磁場強度は１．３Ｔであった。比較のため、本実施例と同じ材料の複数の超電導バルク体からなる第一の超電導バルク体のみで同様の測定を行ったところ、隣り合う超電導バルク体の間の磁場強度は０．１Ｔ以下であった。本結果から、本発明の構造を有する超電導バルク磁石において、磁気力が大きな超電導バルク磁石を提供することができる。 After the outer periphery of this superconducting bulk magnet was reinforced with a 5 mm thick stainless steel ring, the magnetic field was cooled and magnetized with an external magnetic field 3T, and the magnetic field distribution was measured in liquid nitrogen (77K). This superconducting bulk magnet had a magnetic field distribution in which the magnetic field strength at the center of each first superconducting bulk body was increased, and the magnetic field strength between adjacent superconducting bulk bodies was 1.3T. For comparison, when the same measurement was performed only on the first superconducting bulk body composed of a plurality of superconducting bulk bodies made of the same material as in this example, the magnetic field strength between adjacent superconducting bulk bodies was 0.1 T or less. there were. From this result, it is possible to provide a superconducting bulk magnet having a large magnetic force in the superconducting bulk magnet having the structure of the present invention.
（実施例２）
CeO2を１．０質量％含み、かつY1Ba2Cu3Oy中に２０モル％のY2BaCuO5が微細分散した一辺５０ｍｍ、高さ２０ｍｍの四角形状の超電導バルク体を３個並べて第一の超電導バルク体とし、その外周に外形１８０ｍｍ×８０ｍｍ、高さ２０ｍｍに１５０ｍｍ×５０ｍｍの内穴を開けた、MgB2の組成からなる第二の超電導バルク体１個を組み合わせて超電導バルク磁石を作製した。第一の超電導バルク体を構成する個々の超電導バルク体は、溶融結晶成長法で単結晶状に結晶成長させたバルク体から所定の形状に加工した。一方、第二の超電導バルク体は、ＨＩＰ法により９８ＭＰａの圧力で作製した多結晶状のバルク体から所定の形状に加工したものであり、その充填率は８０％であった。また、複数個の超電導バルク体からなる第一の超電導バルク体と第二の超電導バルク体とを組み合わせて超電導バルク磁石を作製する際、個々の超電導バルク体の間及び第一の超電導バルク体と第二の超電導バルク体との間にグリースを塗布して緩衝層とした。
(Example 2)
Three rectangular superconducting bulks each containing 50 mass% of CeO 2 and 20 mol% Y 2 BaCuO 5 finely dispersed in Y 1 Ba 2 Cu 3 O y and having a side of 50 mm and a height of 20 mm are arranged side by side. A superconducting bulk magnet is formed by combining one second superconducting bulk body composed of MgB 2 and having an outer diameter of 180 mm × 80 mm and an inner hole of 150 mm × 50 mm at a height of 20 mm as the first superconducting bulk body. Was made. The individual superconducting bulk bodies constituting the first superconducting bulk body were processed into a predetermined shape from the bulk body crystal-grown into a single crystal by the melt crystal growth method. On the other hand, the second superconducting bulk body was obtained by processing a polycrystalline bulk body produced by the HIP method at a pressure of 98 MPa into a predetermined shape, and the filling rate was 80%. Further, when a superconducting bulk magnet is manufactured by combining a first superconducting bulk body composed of a plurality of superconducting bulk bodies and a second superconducting bulk body, between each superconducting bulk body and the first superconducting bulk body, Grease was applied between the second superconducting bulk body to form a buffer layer.
この超電導バルク磁石の外周を肉厚２ｍｍのステンレス鋼のリングで補強した後、外部磁場５Ｔで磁場中冷却して着磁し、２０Ｋで磁場分布を測定した。この超電導バルク磁石は、個々の第一の超電導バルク体の中央部の磁場強度が強くなる磁場分布を有し、隣り合う第一の超電導バルク体の間の磁場強度は１Ｔであった。比較のため、加圧をしない焼結法で作製した充填率５０％の第二の超電導バルク体であるMgB2を用いた超電導バルク磁石で同様の測定を行ったところ、第二の超電導バルク体にクラックが発生し、そこから磁場が漏れたため、隣り合う超電導バルク体の間の磁場強度は０．１Ｔ以下であった。本結果から、本発明の構造を有する超電導バルク磁石において、磁気力が大きな超電導バルク磁石を提供することができる。 The outer periphery of this superconducting bulk magnet was reinforced with a 2 mm thick stainless steel ring, and then cooled and magnetized in an external magnetic field 5T, and the magnetic field distribution was measured at 20K. This superconducting bulk magnet has a magnetic field distribution in which the magnetic field strength at the center of each first superconducting bulk body is increased, and the magnetic field strength between adjacent first superconducting bulk bodies is 1T. For comparison, when the same measurement was performed with a superconducting bulk magnet using MgB 2 which is a second superconducting bulk body with a filling rate of 50% prepared by a sintering method without applying pressure, the second superconducting bulk body was obtained. Since a crack was generated and a magnetic field leaked therefrom, the magnetic field strength between adjacent superconducting bulk bodies was 0.1 T or less. From this result, it is possible to provide a superconducting bulk magnet having a large magnetic force in the superconducting bulk magnet having the structure of the present invention.
（実施例３）
Ptを０．５質量％およびAgを１５質量％含み、かつGd1Ba2Cu3Oy中に３０モル％のY2BaCuO5が微細分散した外径４０ｍｍ×３０ｍｍ、高さ１５ｍｍの四角形状の第一の超電導バルク体６個を３個×２列に並べて超電導バルク集合体とし、その外周に外形１３０ｍｍ×１２０ｍｍ、高さ１５ｍｍに９０ｍｍ×８０ｍｍの内穴を開けた、MgB2の組成からなる第二の超電導バルク体１個を組み合わせて超電導バルク磁石を作製した。第一の超電導バルク体を構成する個々の超電導バルク体は、溶融結晶成長法で単結晶状に結晶成長させたバルク体から所定の形状に加工した。一方、第二の超電導バルク体は、ＨＩＰ法により１９６ＭＰａの圧力で作製した多結晶状のバルク体から所定の形状に加工したもので、その充填率は９０％であった。また、複数個の超電導バルク体からなる第一の超電導バルク体と第二の超電導バルク体とを組み合わせて超電導バルク磁石を作製する際、個々の超電導バルク体の間及び第一の超電導バルク体と第二の超電導バルク体との間に融点６０℃の低融点金属を充填して緩衝層とした。
(Example 3)
A rectangular shape having an outer diameter of 40 mm × 30 mm and a height of 15 mm, containing 0.5% by mass of Pt and 15% by mass of Ag, and 30 mol% of Y 2 BaCuO 5 finely dispersed in Gd 1 Ba 2 Cu 3 O y From the composition of MgB 2 in which six first superconducting bulk bodies were arranged in 3 × 2 rows to form a superconducting bulk assembly, and an outer hole of 130 mm × 120 mm and an inner hole of 90 mm × 80 mm were formed at a height of 15 mm. A superconducting bulk magnet was manufactured by combining one second superconducting bulk body. The individual superconducting bulk bodies constituting the first superconducting bulk body were processed into a predetermined shape from the bulk body crystal-grown into a single crystal by the melt crystal growth method. On the other hand, the second superconducting bulk body was processed into a predetermined shape from a polycrystalline bulk body produced at a pressure of 196 MPa by the HIP method, and the filling rate was 90%. Further, when a superconducting bulk magnet is manufactured by combining a first superconducting bulk body composed of a plurality of superconducting bulk bodies and a second superconducting bulk body, between each superconducting bulk body and the first superconducting bulk body, A low melting point metal having a melting point of 60 ° C. was filled between the second superconducting bulk body to form a buffer layer.
この超電導バルク磁石の外周を肉厚３ｍｍのステンレス鋼のリングで補強した後、外部磁場５Ｔで磁場中冷却して着磁し、３０Ｋで磁場分布を測定した。この超電導バルク磁石は、個々の超電導バルク体の中央部の磁場強度が強くなる磁場分布を有し、隣り合う超電導バルク体の間の磁場強度は１Ｔであった。比較のため、緩衝層を設けない超電導バルク磁石で同様の測定を行ったところ、６個の超電導バルク体のうち１個に小さな破損が発生し、その箇所で複数個の超電導バルク体からなる第一の超電導バルク体から発生する周期的な磁場分布に乱れが生じた。本結果から、本発明の構造を有する超電導バルク磁石において、磁気力が大きな超電導バルク磁石を提供することができる。 The outer periphery of this superconducting bulk magnet was reinforced with a 3 mm thick stainless steel ring, and then cooled and magnetized in an external magnetic field 5T, and the magnetic field distribution was measured at 30K. This superconducting bulk magnet had a magnetic field distribution in which the magnetic field strength at the center of each superconducting bulk body was increased, and the magnetic field strength between adjacent superconducting bulk bodies was 1T. For comparison, a similar measurement was performed using a superconducting bulk magnet without a buffer layer. As a result, one of the six superconducting bulk bodies was slightly damaged, and a plurality of superconducting bulk bodies were formed at that location. Disturbance occurred in the periodic magnetic field distribution generated from one superconducting bulk material. From this result, it is possible to provide a superconducting bulk magnet having a large magnetic force in the superconducting bulk magnet having the structure of the present invention.
１ 超電導バルク体
２ 第一の超電導バルク体
３ 第二の超電導バルク体
４ 緩衝層
DESCRIPTION OF SYMBOLS 1
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| WO2017057634A1 (en) * | 2015-10-02 | 2017-04-06 | 新日鐵住金株式会社 | Oxide superconducting bulk magnet |
| JPWO2017057634A1 (en) * | 2015-10-02 | 2018-08-09 | 新日鐵住金株式会社 | Oxide superconducting bulk magnet |
| US20180301260A1 (en) * | 2015-10-02 | 2018-10-18 | Nippon Steel & Sumitomo Metal Corporation | Oxide superconducting bulk magnet |
| EP3358581A4 (en) * | 2015-10-02 | 2019-05-15 | Nippon Steel & Sumitomo Metal Corporation | Oxide superconducting bulk magnet |
| US10748691B2 (en) | 2015-10-02 | 2020-08-18 | Nippon Steel Corporation | Oxide superconducting bulk magnet |
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