JP2005129412A - MgB2 SUPERCONDUCTIVE WIRE ROD AND ITS MANUFACTURING METHOD - Google Patents

MgB2 SUPERCONDUCTIVE WIRE ROD AND ITS MANUFACTURING METHOD Download PDF

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JP2005129412A
JP2005129412A JP2003365108A JP2003365108A JP2005129412A JP 2005129412 A JP2005129412 A JP 2005129412A JP 2003365108 A JP2003365108 A JP 2003365108A JP 2003365108 A JP2003365108 A JP 2003365108A JP 2005129412 A JP2005129412 A JP 2005129412A
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superconducting wire
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JP4136896B2 (en
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Hiroaki Kumakura
浩明 熊倉
Akiyoshi Matsumoto
明善 松本
Hitoshi Kitaguchi
仁 北口
Masazumi Hirakawa
正澄 平川
Hideyuki Yamada
秀之 山田
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National Institute for Materials Science
Central Japan Railway Co
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Central Japan Railway Co
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an MgB<SB>2</SB>superconductive wire rod with improved critical current density (Jc) useful for a superconductive linear motor car, MRI medical diagnostic device, semiconductor single crystal pulling-up device, superconductive energy storage, superconductive rotating machine, superconductive transformer, superconductive cable or the like. <P>SOLUTION: Wire rods micro-fabricated into high-purity nanosize ones of an average particle size of 500 nm or less by a thermal plasma method are used as Mg materials of the MgB<SB>2</SB>superconductive wire rods subjected to wire rolling processing and heating treatment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この出願の発明は、超電導リニアモーターカー、ＭＲＩ医療診断装置、超電導エネルギー貯蔵、超電導回転機、超電導変圧器、超電導ケーブルなどの多様な用途に有用なＭｇＢ2超電導線材とその製造方法に関するものである。 The invention of this application relates to a MgB 2 superconducting wire useful for various applications such as a superconducting linear motor car, MRI medical diagnostic apparatus, superconducting energy storage, superconducting rotating machine, superconducting transformer, and superconducting cable, and a manufacturing method thereof. .

ＭｇＢ2超電導体は他の金属系超電導線材と比べて臨界電流密度（Ｊｃ）が高いだけでなく、現時点では金属系超電導体の中では最高の超電導臨界温度（３９Ｋ）を有するとされている。しかもＭｇＢ2超電導体は線材加工が比較的容易なため低コスト化が期待できることから、ＭｇＢ2超電導体の線材化の研究開発が盛んに行なわれている（特許文献１）。 The MgB 2 superconductor not only has a higher critical current density (Jc) than other metal-based superconducting wires, but is currently considered to have the highest superconducting critical temperature (39K) among metal-based superconductors. In addition, since the MgB 2 superconductor is relatively easy to process the wire, and thus cost reduction can be expected, research and development of making the MgB 2 superconductor into a wire has been actively conducted (Patent Document 1).

このＭｇＢ2を線材化する主要な方法としては、ＭｇＢ2粉末またはマグネシウム粉末とＢ粉末を金属シース（金属管）に充填して伸線する、いわゆるパウダー・イン・チューブ（P.I.T）と称される方法がよく知られている（特許文献２）。
特開２００２−３５２６４９号公報 特開２００３−２１７３７０号公報 The primary method of wire of the MgB 2, which drawing is filled with MgB 2 powder or magnesium powder and B powder in the metal sheath (metal tube), so called powder-in-tube (PIT) The method is well known (Patent Document 2).
JP 2002-352649 A JP 2003-217370 A

ＭｇＢ2超電導体を線材化するための主要な方法とされているパウダー・イン・チューブ（P.I.T）法においては、さらに臨界電流密度（Ｊｃ）を向上させるために、金属粉末を添加したり、ＭｇＢ2原料を熱処理やボール・ミルによって粉末微細化するなどの種々の方法が試みられている。 In the powder-in-tube (PIT) method, which is the main method for forming a MgB 2 superconductor into a wire, in order to further improve the critical current density (Jc), metal powder is added, or MgB 2. Various methods such as heat treatment or ball milling of raw materials have been tried.

しかしながら、これまでのところ、超電導線材の性能としての臨界電流密度（Ｊｃ）の向上は難しく、実用化への大きな障害になっている。そこで、以上のとおりの事情に鑑み、この出願の発明は、比較的簡便な線材加工法により、充分に実用化レベルに達する臨界電流密度（Ｊｃ）を有するＭｇＢ2超電導線材を低コストで製造することのできる新しい方法を提供することを課題としている。 However, so far, it has been difficult to improve the critical current density (Jc) as the performance of the superconducting wire, which has been a major obstacle to practical use. Accordingly, in view of the circumstances as described above, the invention of this application manufactures a MgB 2 superconducting wire having a critical current density (Jc) sufficiently reaching a practical level at a low cost by a relatively simple wire processing method. The challenge is to provide a new way to do this.

この出願の発明は、上記の課題を解決するものとして、第１には、平均粒径５００ｎｍ以下のナノサイズのＭｇ粉末とともにＢ粉末を金属シースに入れて線材加工し、次いで５００℃〜８００℃の温度範囲で加熱処理するＭｇＢ2超電導線材の製造方法を提供する。 The invention of this application is to solve the above problems. First, B powder is put into a metal sheath together with nano-sized Mg powder having an average particle size of 500 nm or less, followed by wire processing, and then 500 ° C to 800 ° C. to provide a method of manufacturing a MgB 2 superconducting wire to heat treatment at a temperature range.

第２には、平均粒径５００ｎｍ以下のナノサイズのＭｇ粉末とともにＢ粉末、さらに添加剤としてＳｉＣ粉末を加えたものを金属シースに入れて線材加工し、次いで５００℃〜８００℃の温度範囲で加熱処理するＭｇＢ2超電導線材の製造方法を提供する。 Second, the nano-sized Mg powder having an average particle size of 500 nm or less and B powder and further SiC powder as an additive are added to a metal sheath and processed into a wire, and then in a temperature range of 500 ° C. to 800 ° C. A method for producing a heat-treated MgB 2 superconducting wire is provided.

第３には、Ｍｇ粉末は熱プラズマプロセスによりナノサイズに微細化されたものとする上記いずれかのＭｇＢ2超電導線材の製造方法を提供し、第４には、Ｍｇ粉末は、酸素濃度１０ｐｐｍ以下の希ガスに３〜１０ｖｏｌ％の水素を混合したガス雰囲気下に、炉内反応部温度２００℃〜２０００℃の分布での熱プラズマプロセスにより微細化されたものとするＭｇＢ2超電導線材の製造方法を提供する。 Third, there is provided a method for producing any of the MgB 2 superconducting wires described above, wherein the Mg powder is refined to a nano size by a thermal plasma process, and fourth, the Mg powder has an oxygen concentration of 10 ppm or less. Of MgB 2 superconducting wire that has been refined by a thermal plasma process with a distribution in the reactor reaction temperature of 200 ° C. to 2000 ° C. in a gas atmosphere in which 3 to 10 vol% of hydrogen is mixed with a rare gas of I will provide a.

また、第５には、線材加工した複数の線材を金属シースに入れて、さらに線材加工する上記のＭｇＢ2超電導線材の製造方法を提供する。 Fifth, the present invention provides a method for producing the above MgB 2 superconducting wire material, in which a plurality of wire materials processed into a wire material are placed in a metal sheath and further processed into a wire material.

そして第６には、上記のいずれかの方法で製造されたＭｇＢ2超電導線材を提供する。 Sixth, the MgB 2 superconducting wire manufactured by any of the above methods is provided.

上記のとおりのこの出願の第１の発明の製造方法によれば、高い臨界電流密度（Ｊｃ）を有する超電導線材が実現できる。   According to the manufacturing method of the first invention of this application as described above, a superconducting wire having a high critical current density (Jc) can be realized.

また、上記第２ないし第５までの発明の製造方法によれば、さらに高い臨界電流密度（Ｊｃ）を有する超電導線材が実現できる。   Moreover, according to the manufacturing methods of the second to fifth inventions, a superconducting wire having a higher critical current density (Jc) can be realized.

そして上記第６のＭｇＢ2超電導線材によれば、高い臨界電流密度（Ｊｃ）が得られる。 According to the sixth MgB 2 superconducting wire, a high critical current density (Jc) can be obtained.

ＭｇＢ2超電導線材の臨界電流密度（Ｊｃ）を大きくするためには、ＭｇＢ2粉末の充填密度の向上や、ＭｇＢ2粒子同士の接合性の向上および磁束線を固定するためのピンニングセンターの超電導体への導入が効果的であるとされている。この出願の発明では、これらの観点も考慮して、ＭｇＢ2超電導線材の原料であるマグネシウム（Ｍｇ）粉末として、これまで想定されてこなかった、ナノメートル（ｎｍ）サイズの粒径を有するものを使用することを必須とし、特徴としている。すなわち、平均粒径が５００ｎｍ以下のＭｇ粉末を用いることである。このことは、ミクロンメートル（μｍ）サイズ、一般的には数ミクロンから数百ミクロンのものを用いた従来法との大きな差異である。 In order to increase the critical current density (Jc) of the MgB 2 superconducting wire, it is possible to improve the packing density of the MgB 2 powder, improve the bonding property between the MgB 2 particles and fix the magnetic flux lines. It is said that the introduction is effective. In the invention of this application, taking these viewpoints into consideration, a magnesium (Mg) powder that is a raw material of the MgB 2 superconducting wire has a nanometer (nm) size particle size that has not been assumed so far. It is essential to use and features. In other words, Mg powder having an average particle size of 500 nm or less is used. This is a significant difference from conventional methods using micron (μm) sizes, typically a few microns to a few hundred microns.

また、この出願の発明では、Ｂ粉末は、通常の市販品として粒径１０〜３００μｍ程度のものを用いればよく、Ｍｇ粉末と同程度のナノサイズの粒径のものを用いる必要はない。そして、ＭｇとＢの混合粉末としてナノサイズのものを用いる必要もない。また、このような混合粉末そのものは作製が困難であって、不純物の混入等の不都合が避けられない。   In the invention of this application, the B powder may be a commercially available product having a particle size of about 10 to 300 μm, and it is not necessary to use a nano-size particle size comparable to that of the Mg powder. Further, it is not necessary to use a nano-sized powder as a mixed powder of Mg and B. In addition, such a mixed powder itself is difficult to produce, and inconveniences such as contamination of impurities cannot be avoided.

この出願の発明においては、Ｍｇ粉末が、平均粒径が５００ｎｍを超える場合には、ＭｇＢ2超電導線材のＪｃの向上はあまり期待できない。一般的には、Ｍｇ粉末の平均粒径は、５０ｎｍ以上５００ｎｍ以下とすることが考慮される。 In the invention of this application, when the Mg powder has an average particle size exceeding 500 nm, improvement in Jc of the MgB 2 superconducting wire cannot be expected. In general, it is considered that the average particle diameter of the Mg powder is 50 nm or more and 500 nm or less.

そして、この出願の発明の平均粒径５００ｎｍ以下のＭｇ粉末は、酸素やその他不純物の混入が極力抑えられていることが望ましい。このため、この出願の発明のナノサイズのＭｇ粉末は、熱プラズマプロセスによって作製されたものが好適に使用される。熱プラズマプロセスは、酸化反応や異物の混入を抑制して高純度のナノサイズに微細加工することを可能とする。また、この出願の発明では、熱プラズマプロセスにより微細化したＭｇ粉末とＢ粉末に、さらには添加金属としてのシリコン・カーバイド（ＳｉＣ）粉末を使用することも有効である。   The Mg powder having an average particle diameter of 500 nm or less according to the invention of this application is desirably suppressed from mixing oxygen and other impurities as much as possible. For this reason, the nano-sized Mg powder of the invention of this application is preferably used that produced by a thermal plasma process. The thermal plasma process makes it possible to finely process the nano-sized material with high purity by suppressing the oxidation reaction and mixing of foreign substances. In the invention of this application, it is also effective to use silicon carbide (SiC) powder as an additive metal for Mg powder and B powder refined by a thermal plasma process.

市販されているＭｇ粉末を熱プラズマプロセスにより微細化すると、クリーンな気相プロセスのため酸化反応や異物混入が極めて低く、高純度で分散性がよく比較的粒子径の揃ったナノサイズに微細化したＭｇ粒子を製造することができる。熱プラズマプロセスはボール・ミル法に比べて高純度の微細化粒子の製造が可能であるのに加え粒径を１桁から２桁小さくでき、また製造速度も速く大量製造に適している。   When a commercially available Mg powder is refined by a thermal plasma process, the oxidation reaction and foreign matter contamination are extremely low because of a clean gas phase process, and it is refined to a nano size with high purity, good dispersibility, and relatively uniform particle size. Mg particles can be produced. Compared with the ball mill method, the thermal plasma process can produce fine particles with high purity, and also can reduce the particle size by one to two orders of magnitude, and has a high production speed and is suitable for mass production.

熱プラズマプロセスにおいては、マグネシウム粉末の粒子は微細化すればするほど表面積が増大し、酸素に触れると発火の危険性があるため、微細化加工する場合はアルゴンガスなどの不活性ガス雰囲気で行う等の慎重な取り扱いを必要とする。より具体的には、この出願の発明においては、酸素濃度１００ｐｐｍ以下、好ましくは１０ｐｐｍ以下のアルゴン等の希ガスに２０ｖｏｌ％以下、好ましくは３〜１０ｖｏｌ％の水素を混合したガス雰囲気下に、炉内反応部の温度が２００℃〜２０００℃の分布において熱プラズマプロセスによるＭｇ粉末の微細化を行うことが望ましい。   In the thermal plasma process, the surface area of the magnesium powder increases as it is refined, and there is a danger of ignition when exposed to oxygen. Therefore, the refinement process is performed in an inert gas atmosphere such as argon gas. It requires careful handling. More specifically, in the invention of this application, a furnace is used in a gas atmosphere in which a rare gas such as argon having an oxygen concentration of 100 ppm or less, preferably 10 ppm or less is mixed with 20 vol% or less, preferably 3 to 10 vol% of hydrogen. It is desirable to refine the Mg powder by a thermal plasma process in a distribution in which the temperature of the inner reaction part is 200 ° C. to 2000 ° C.

以上のようにして微細化したＭｇ粉末は、この出願の発明においては、Ｂ粉末とともに、さらにはＳｉＣ粉末も、金属シースに充填し、これを線材加工した後不活性雰囲気中で５００〜８００℃の温度温度範囲で加熱処理してＭｇＢ2超電導線材とする。 In the invention of this application, the Mg powder refined as described above is filled with a metal sheath together with the B powder, and after processing the wire, the powder is processed at 500 to 800 ° C. in an inert atmosphere. To a MgB 2 superconducting wire.

添付した図１にしたがって説明すると、この出願の発明の製造工程では、市販されているＭｇ粉末（１）を不活性雰囲気中で熱プラズマプロセスにより平均粒径５００ｎｍ以下のＭｇ粉末（２）に微細化する。周知のとおり、熱プラズマプロセスとは１０，０００℃を超える超高温の炎で気体を電磁気的に励起して電離させ、この中に原料粉末を噴射して瞬時に溶融して表面張力により球状化する方法である。   Referring to FIG. 1 attached, in the manufacturing process of the invention of this application, commercially available Mg powder (1) is finely divided into Mg powder (2) having an average particle size of 500 nm or less by a thermal plasma process in an inert atmosphere. Turn into. As is well known, the thermal plasma process is an extremely high-temperature flame exceeding 10,000 ° C that excites the gas electromagnetically and ionizes it, injects the raw material powder into it, instantly melts it, and spheroidizes by surface tension. It is a method to do.

微細化したＭｇ粉末（２）とＢ粉末（３）を管（５）に充填して線状に加工する。所望によって、ＳｉＣ粉末（４）が添加されてもよい。伸線加工された線状体は、次いで、前記のとおり、５００〜８００℃の温度範囲で熱処理される。   The refined Mg powder (2) and B powder (3) are filled into the tube (5) and processed into a linear shape. If desired, SiC powder (4) may be added. The drawn wire is then heat-treated in the temperature range of 500 to 800 ° C. as described above.

なお、伸線加工された線状体の複数本のものがさらに管に充填されて伸線加工されたものを加熱処理するようにしてもよい。   In addition, you may make it heat-process what the several thing of the linear body by which the wire drawing was carried out was filled with the pipe | tube, and was drawn.

そこで以下に実施例を説明する。もちろん、以下の例によって発明が限定されることはない。   Accordingly, examples will be described below. Of course, the invention is not limited by the following examples.

＜実施例１＞
粒径が１０〜１００μｍの市販のＭｇ粉末を熱プラズマ法により微細化した。炉内雰囲気は、純度９９．９９９％、酸素濃度１０ｐｐｍ以下のアルゴンガスに、５％の水素を混合したものとし、炉内反応部温度２００℃〜２０００℃の分布において、平均粒径２８５ｎｍのＭｇ粉末を作製した。図２は、このＭｇ粉末のＳＥＭ写真である。微細球状化されたＭｇ粉末が確認できる。この微細化されたＭｇ粉末と、粒径１０〜１５０μｍの市販のＢ粉末を外径６ｍｍ、内径４ｍｍの鉄管に充填し、溝ロール加工と平ロール圧延により幅５ｍｍ、厚さ０．５ｍｍのテープ状に加工した。図３は、テープ状に加工された超電導線材の断面を示した写真である。管（５）に囲まれているのが、ＭｇＢ2超電導層（６）である。この線材に対しアルゴンガス雰囲気中で、６５０℃、１時間の加熱処理を行い、臨界電流密度（Ｊｃ）を測定した。その結果、図５に示したように、４．２Ｋの温度、１２Ｔの磁界中で２５Ａ／ｍｍ2、また４．２Ｋの温度、７Ｔの磁界中で４８０Ａ／ｍｍ2という高い臨界電流密度（Ｊｃ）値が得られた。７Ｔ以下の磁界においては、さらに電流値が大きくなることが確認された。
＜実施例２＞
実施例１における微細化Ｍｇ粉末とＢ粉末に、添加剤として１０ａｔ％のＳｉＣ粉末を加えて、実施例１と同じ条件で、ＭｇＢ2超電導線材を作製した。図４は、そのＳＥＭ写真である。 <Example 1>
Commercially available Mg powder having a particle size of 10 to 100 μm was refined by a thermal plasma method. The atmosphere in the furnace is a mixture of argon gas having a purity of 99.999% and oxygen concentration of 10 ppm or less and 5% hydrogen. A powder was prepared. FIG. 2 is an SEM photograph of this Mg powder. Fine spheroidized Mg powder can be confirmed. This refined Mg powder and a commercially available B powder having a particle size of 10 to 150 μm are filled into an iron tube having an outer diameter of 6 mm and an inner diameter of 4 mm, and a tape having a width of 5 mm and a thickness of 0.5 mm by groove roll processing and flat roll rolling. Processed into a shape. FIG. 3 is a photograph showing a cross section of a superconducting wire processed into a tape shape. Surrounded by the tube (5) is the MgB 2 superconducting layer (6). The wire was heat-treated at 650 ° C. for 1 hour in an argon gas atmosphere, and the critical current density (Jc) was measured. As a result, as shown in FIG. 5, 4.2K temperature, 25A / mm 2 in a magnetic field of 12T, also 4.2K temperature, high critical current density of 480A / mm 2 in a magnetic field of 7T (Jc ) Value was obtained. It was confirmed that the current value further increased in a magnetic field of 7T or less.
<Example 2>
An MgB 2 superconducting wire was produced under the same conditions as in Example 1 by adding 10 at% SiC powder as an additive to the refined Mg powder and B powder in Example 1. FIG. 4 is an SEM photograph thereof.

この超電導線材については、図５に示したように、４．２Ｋの温度、１２Ｔの磁界中で１１０Ａ／ｍｍ2、また４．２Ｋの温度、９Ｔの磁界中で３９０Ａ／ｍｍ2という高い臨界電流密度（Ｊｃ）値が得られた。 As shown in FIG. 5, this superconducting wire has a high critical current of 110 A / mm 2 at a temperature of 4.2 K and a magnetic field of 12 T, and 390 A / mm 2 at a temperature of 4.2 K and a magnetic field of 9 T. Density (Jc) values were obtained.

この出願の発明は以上の実施形態および実施例に限定されるものではなく、詳細については様々な態様が可能であることは言うまでもない。   The invention of this application is not limited to the above embodiments and examples, and it goes without saying that various aspects are possible in detail.

以上詳しく説明した通り、この出願の発明によって得られるＭｇＢ2超電導線材は、高い臨界電流密度（Ｊｃ）を有し、超電導リニアモーターカー、ＭＲＩ医療診断装置、半導体単結晶引き上げ装置、超電導エネルギー貯蔵、超電導回転機、超電導変圧器、超電導ケーブルなどに有用な材料となる。 As described above in detail, the MgB 2 superconducting wire obtained by the invention of this application has a high critical current density (Jc), and includes a superconducting linear motor car, an MRI medical diagnostic device, a semiconductor single crystal pulling device, a superconducting energy storage, It is a useful material for superconducting rotating machines, superconducting transformers, superconducting cables, etc.

ＭｇＢ2超電導線材の製造工程を例示した図である。It is illustrated FIG manufacturing process of MgB 2 superconducting wire. 実施例１において、熱プラズマ法により高純度に微細化されたＭｇ粉末の電子顕微鏡ＳＥＭ写真である。In Example 1, it is an electron microscope SEM photograph of Mg powder refined | miniaturized with high purity by the thermal plasma method. 実施例１において製造したＭｇＢ2超電導線材の断面図を例示したものである。FIG. 3 illustrates a cross-sectional view of the MgB 2 superconducting wire manufactured in Example 1. FIG. 実施例２において、微細加工したＭｇ粉末とＢ粉末、および添加剤１０ａｔ％−ＳｉＣにより作製したＭｇＢ2超電導線材の電子顕微鏡ＳＥＭ写真である。In Example 2, an electron microscope SEM photograph of microfabricated Mg powder and B powder, and MgB 2 superconducting wire fabricated by additive 10at% -SiC. この出願の発明によって得られたＭｇＢ2超電導線材のＪｃ−印加磁界曲線を示した図である。Is a diagram showing a Jc- applied magnetic field curve of MgB 2 superconducting wire obtained by the invention of this application.

符号の説明Explanation of symbols

１ Ｍｇ粉末
２ 微細加工したＭｇ粉末
３ Ｂ粉末
４ ＳｉＣ粉末
５ 管
６ ＭｇＢ2超電導層

1 Mg powder 2 Finely processed Mg powder 3 B powder 4 SiC powder 5 Tube 6 MgB 2 superconducting layer

Claims (6)

平均粒径５００ｎｍ以下のナノサイズのＭｇ粉末とともにＢ粉末を金属シースに入れて線材加工し、次いで５００℃〜８００℃の温度範囲で加熱処理することを特徴とするＭｇＢ2超電導線材の製造方法。 A method for producing a MgB 2 superconducting wire, characterized in that B powder is put into a metal sheath together with nano-sized Mg powder having an average particle size of 500 nm or less and wire processing is performed, followed by heat treatment in a temperature range of 500 ° C to 800 ° C. 平均粒径５００ｎｍ以下のナノサイズのＭｇ粉末とともにＢ粉末、さらに添加剤としてＳｉＣ粉末を加えたものを金属シースに入れて線材加工し、次いで５００℃〜８００℃の温度範囲で加熱処理することを特徴とするＭｇＢ2超電導線材の製造方法。 What is obtained by adding a B powder together with a nano-sized Mg powder having an average particle size of 500 nm or less and further adding SiC powder as an additive to a metal sheath and processing the wire, followed by heat treatment in a temperature range of 500 ° C. to 800 ° C. method of manufacturing a MgB 2 superconducting wire characterized. Ｍｇ粉末は熱プラズマプロセスによりナノサイズに微細化されたものであることを特徴とする請求項１または２記載のＭｇＢ2超電導線材の製造方法。 The method for producing a MgB 2 superconducting wire according to claim 1 or 2, wherein the Mg powder is refined to a nano size by a thermal plasma process. Ｍｇ粉末は、酸素濃度１０ｐｐｍ以下の希ガスに３〜１０ｖｏｌ％の水素を混合したガス雰囲気下に、炉内反応部温度２００℃〜２０００℃の分布での熱プラズマプロセスにより微細化されたものであることを特徴とする請求項３記載のＭｇＢ2超電導線材の製造方法。 Mg powder is refined by a thermal plasma process in a gas atmosphere in which 3 to 10% by volume of hydrogen is mixed with a rare gas having an oxygen concentration of 10 ppm or less and the reaction temperature in the furnace is 200 ° C. to 2000 ° C. The method for producing a MgB 2 superconducting wire according to claim 3, wherein 線材加工した複数の線材を金属シースに入れて、さらに線材加工することを特徴とする請求項１ないし４のいずれかに記載のＭｇＢ2超電導線材の製造方法。 The method for producing a MgB 2 superconducting wire according to any one of claims 1 to 4, wherein a plurality of wires processed into wires are put into a metal sheath and further processed into wires. 請求項１ないし５のいずれかの方法で製造されたものであることを特徴とするＭｇＢ2超電導線材。

An MgB 2 superconducting wire produced by the method according to any one of claims 1 to 5.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007049623A1 (en) * 2005-10-24 2007-05-03 National Institute For Materials Science PROCESS FOR PRODUCING MgB2 SUPERCONDUCTING WIRE ROD
JP2008091325A (en) * 2006-08-28 2008-04-17 Bruker Biospin Ag SUPERCONDUCTING ELEMENT CONTAINING MgB2
JP2009517808A (en) * 2005-11-25 2009-04-30 カウンスィル オブ サイエンティフィック アンド インダストリアル リサーチ Process for continuous production of magnesium diboride-based superconductors
JP2009134969A (en) * 2007-11-30 2009-06-18 Hitachi Ltd Manufacturing method of mgb2 superconductive wire rod
CN110844917A (en) * 2019-12-04 2020-02-28 成都理工大学 Preparation method of magnesium boride nanoparticles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007049623A1 (en) * 2005-10-24 2007-05-03 National Institute For Materials Science PROCESS FOR PRODUCING MgB2 SUPERCONDUCTING WIRE ROD
US8173579B2 (en) 2005-10-24 2012-05-08 National Institute For Materials Science Fabrication method of a MgB2 superconducting tape and wire
JP5229868B2 (en) * 2005-10-24 2013-07-03 独立行政法人物質・材料研究機構 Method for manufacturing MgB2 superconducting wire
JP2009517808A (en) * 2005-11-25 2009-04-30 カウンスィル オブ サイエンティフィック アンド インダストリアル リサーチ Process for continuous production of magnesium diboride-based superconductors
JP2008091325A (en) * 2006-08-28 2008-04-17 Bruker Biospin Ag SUPERCONDUCTING ELEMENT CONTAINING MgB2
JP2009134969A (en) * 2007-11-30 2009-06-18 Hitachi Ltd Manufacturing method of mgb2 superconductive wire rod
CN110844917A (en) * 2019-12-04 2020-02-28 成都理工大学 Preparation method of magnesium boride nanoparticles

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