JP5107638B2 - MgB2を含有する超伝導素子 - Google Patents
MgB2を含有する超伝導素子 Download PDFInfo
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- JP5107638B2 JP5107638B2 JP2007219934A JP2007219934A JP5107638B2 JP 5107638 B2 JP5107638 B2 JP 5107638B2 JP 2007219934 A JP2007219934 A JP 2007219934A JP 2007219934 A JP2007219934 A JP 2007219934A JP 5107638 B2 JP5107638 B2 JP 5107638B2
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Description
*その高い転移温度、
*その弱結合(weak−link)のない性質、
*低い材料コスト、及び
*小さな異方性である。
*マグネシウムの置換、
*反応時の粉末の高密度化、
*二次相形成の低減、
*粒界転位の形成の促進、又は
*MgB2粒子のサイズ及び領域の縮小がある。
2 金属マトリックス
3 保護金属層
4 高導電素子、安定化Cu
Claims (14)
- 二ホウ化マグネシウム(=MgB2)を含有する、線状及びテープ状のいずれか1つの形態を有する超伝導素子であって、
金属マトリックス(2)に密閉されかつ少なくとも1つの細長い熱安定化用素子(4)も有する5〜500ミクロンの線径の少なくとも1つの超伝導フィラメント(1)を備え、
前記超伝導フィラメントが、前記マトリックス(2)及び前記熱安定化用素子(4)から保護金属層(3)によって分離され、前記超伝導フィラメントが、第1の添加剤として炭化ホウ素(=B 4 C)粉末が導入された粉末混合物中の、ホウ素(B)粉末及びマグネシウム(Mg)粉末との間の反応によって形成され、
単体の炭素又は炭素を含む化合物からなる粉末で構成される1つ又は複数の追加の炭素含有粉末添加剤が、前記Mg、B及びB4Cを含む粉末混合物に導入されることを特徴とする超伝導素子。 - B4Cの量と、B4Cへの追加の炭素含有粉末添加剤の総和の量との比が、15:1〜1:15の範囲であることを特徴とする、請求項1記載の超伝導素子。
- 前記追加の炭素含有粉末添加剤のうちの少なくとも1つが、SiC、Mo2C、WC、VC、TaC、TiC、ZrC、NbCをベースとする2元、3元又は4元化合物であることを特徴とする、請求項1又は2記載の超伝導素子。
- 前記追加の炭素含有粉末添加剤のうちの少なくとも1つが、ナノチューブ又はダイヤモンドからなる単体の炭素であることを特徴とする、請求項1乃至3のいずれか1項に記載の超伝導素子。
- 前記追加の炭素含有粉末添加剤のうちの少なくとも1つが、炭酸塩又は炭水化物であることを特徴とする、請求項1乃至4のいずれか1項に記載の超伝導素子。
- 前記追加の炭素含有粉末添加剤のうちの少なくとも1つが、化合物(R.E.)C2又は(La1−xMx)C3、ただしM=Lu、Sc、Th、Y、あるいは黒鉛層間化合物のうちの1つであることを特徴とする、請求項1乃至5のいずれか1項に記載の超伝導素子。
- 前記B4C粉末ならびに前記追加の炭素含有粉末添加剤が、5nm〜5μmの大きさの粒子からなることを特徴とする、請求項1乃至6のいずれか1項に記載の超伝導素子。
- B4C粉末の含有量と前記追加の炭素含有粉末添加剤のそれぞれの含有量が、MgB2の含有量に対して0.1〜15重量%であることを特徴とする、請求項1乃至7のいずれか1項に記載の超伝導素子。
- B4Cを含むすべての炭素含有粉末添加剤の総和が、MgB2の含有量に対して1〜20重量%であることを特徴とする、請求項1乃至8のいずれか1項に記載の超伝導素子。
- 最初の前記マグネシウム粉末と前記ホウ素粉末との比Mg:Bが、1:2〜0.8:2.2である、請求項1乃至9のいずれか1項に記載の超伝導素子。
- 前記Mg、B及びB4Cを含む粉末混合物にさらに導入される少なくとも1つの無炭素添加剤が、Mg2Ce、Mg2Cu、Mg2Ga及びMg2Siをベースとする2元、3元又は4元Mg基化合物を含むこと、及び/又は、前記無炭素添加剤が、MgB4、Mo2B5、Mo3B4、MoB、WB2、W2B5、HfB、ZrB2、TaB2、Ta3B4、TiB2、NbB2、VB2、UB2、RuB2、CrB2、BaB6、(R.E.)B6、(R.E.)B12、ただしR.E.は希土類元素をベースとする2元、3元又は4元化合物を含むこと、及び/又は、前記無炭素添加剤が、MoSi2、Mo3Si、WSi2をベースとする2元、3元又は4元化合物を含むこと、及び/又は、前記無炭素添加剤が、Si3N4、BN、Zn(CN)2、AlNをベースとする2元、3元又は4元化合物を含むこと、及び/又は、前記無炭素添加剤が、(RE)2O3、ただしRE=La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、をベースとする2元、3元又は4元化合物、又は酸化物Al2O3、V2O5、Nb2O5、Ta2O5、SiO2、HfO、ZrO、MgO、ZrMo2O8、ZrW2O8、Y2(WO4)3、Al2TiO5、Ti2BaMgO4、SnO2、NbO2、BaCO3のうちの1つを含むこと、及び/又は、前記無炭素添加剤が、単一金属元素Nb、Ta、V、Mo、W、Ti、Zr及びHfを含むことを特徴とする、請求項1乃至10のいずれか1項に記載の超伝導素子。
- 前記マトリックス(2)が、Fe及び/又はFe合金、Ni及び/又はNi合金、Cu及び/又はCu合金、Ti及び/又はTi合金、ステンレス鋼を含むことを特徴とする、請求項1乃至11のいずれか1項に記載の超伝導素子。
- 前記保護金属層(3)が、Nb及び/又はNb合金、Ta及び/又はTa合金、Ti及び/又はTi合金、特にNbTiを含むことを特徴とする、請求項1乃至12のいずれか1項に記載の超伝導素子。
- 請求項1乃至13のいずれか1項に記載の超伝導素子を製造する方法であって、前記B 4 C粉末及び前記追加の炭素含有粉末添加剤が、前記元の粉末混合物に同時に導入されることを特徴とする方法。
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EP20060017856 EP1894906A1 (en) | 2006-08-28 | 2006-08-28 | Superconducting element containing MgB2 |
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DE102008049672B4 (de) | 2008-09-30 | 2015-11-26 | Bruker Eas Gmbh | Supraleiterverbund mit einem Kern oder mit mehreren Filamenten, die jeweils eine MgB2-Phase aufweisen, sowie Vorprodukt und Verfahren zur Herstellung eines Supraleiterverbundes |
DE102009043580B4 (de) * | 2009-09-30 | 2017-01-12 | Karlsruher Institut für Technologie | Verfahren zur Herstellung einer Verbindungsstruktur zwischen zwei Supraleitern und Struktur zur Verbindung zweier Supraleiter |
CN102074309B (zh) * | 2010-11-28 | 2012-08-08 | 上海大学 | 一种硼化镁复合超导材料的制备方法 |
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JP6723179B2 (ja) * | 2017-03-03 | 2020-07-15 | 株式会社日立製作所 | 超伝導体の製造方法 |
JP7048451B2 (ja) | 2018-08-24 | 2022-04-05 | 株式会社日立製作所 | 超電導線材、超電導コイル、磁気発生装置および超電導線材の製造方法 |
JP2023164061A (ja) * | 2022-04-28 | 2023-11-10 | 株式会社日立製作所 | MgB2超電導線材、MgB2超電導線材の製造方法、超電導コイルおよび磁気発生装置 |
CN116779240B (zh) * | 2023-08-16 | 2023-10-20 | 西安聚能超导线材科技有限公司 | 一种二硼化镁超导线材制备方法及二硼化镁超导线材 |
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US4743713A (en) * | 1984-02-10 | 1988-05-10 | United States Department Of Energy | Aluminum-stabilized NB3SN superconductor |
WO2002037581A2 (en) * | 2000-09-15 | 2002-05-10 | American Superconductor Corporation | Superconducting article having low ac loss |
US20030036482A1 (en) * | 2001-07-05 | 2003-02-20 | American Superconductor Corporation | Processing of magnesium-boride superconductors |
US7029645B2 (en) | 2002-06-18 | 2006-04-18 | Motorola, Inc. | Method for non-reactive separation of nanomorphic carbon species |
AUPS305702A0 (en) * | 2002-06-18 | 2002-07-11 | Dou, Shi Xue | Superconducting material and method of synthesis |
JP4481584B2 (ja) | 2003-04-11 | 2010-06-16 | 株式会社日立製作所 | 複合シースMgB2超電導線材およびその製造方法 |
JP4136896B2 (ja) * | 2003-10-24 | 2008-08-20 | 独立行政法人物質・材料研究機構 | MgB2超電導線材とその製造方法。 |
EP1774602A1 (en) * | 2004-07-30 | 2007-04-18 | Columbus Superconductors S.r.l. | Superconducting composite wire made from magnesium diboride |
JP2006127898A (ja) * | 2004-10-28 | 2006-05-18 | Sumitomo Electric Ind Ltd | 焼結体、焼結体の製造方法、超電導線材、超電導機器、および超電導線材の製造方法 |
DE102006048850A1 (de) * | 2006-10-16 | 2008-04-17 | Evonik Degussa Gmbh | Amorphe submicron Partikel |
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