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Intermetallic compound superconductors and alloy superconductors, and methods of making them 実績あり

外国特許コード F110003136
整理番号 A061-16US2
掲載日 2011年6月15日
出願国 アメリカ合衆国
出願番号 20233505
公報番号 20060079402
公報番号 7172993
出願日 平成17年8月12日(2005.8.12)
公報発行日 平成18年4月13日(2006.4.13)
公報発行日 平成19年2月6日(2007.2.6)
国際出願番号 JP2001006383
国際公開番号 WO2002055435
国際出願日 平成13年7月24日(2001.7.24)
国際公開日 平成14年7月18日(2002.7.18)
優先権データ
  • 特願2001-001948 (2001.1.9) JP
  • 2001WO-JP06383 (2001.7.24) WO
  • 2002US-10220272 (2002.9.9) US
発明の名称 (英語) Intermetallic compound superconductors and alloy superconductors, and methods of making them 実績あり
発明の概要(英語) (US7172993)
There are provided an intermetallic compound superconductor that is high in superconducting transition temperature, and an alloy superconductor that is high in superconducting transition temperature and excels in malleability and ductility, as well as a method of making such a superconductor with good reproducibility and at a low cost of manufacture.
This entirely new intermetallic compound superconductor is made of magnesium (Mg) and boron (B) and has a chemical composition expressed by formula: Mg1B2, has a hexagonal AlB2 type crystallographic structure and has a superconducting transition temperature (Tc) of 39 K.
An alloy containing this intermetallic compound excels in malleability and ductility and constitutes the alloy superconductor having a superconducting transition temperature (Tc) of 39 K.
In the method of manufacture, a Mg containing feedstock powder and a B containing feedstock powder are mixed together to form a mixture thereof which is, e.g., hot pressed to produce a semiconductor product.
特許請求の範囲(英語) [claim1]
1. A method of conducting electrical current, comprising the steps of: providing an alloy superconductor, characterized in that it contains an intermetallic compound made of Mg and B, and one or more metallic elements,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim2]
2. A method of conducting electrical current as set forth in claim 1, characterized in that said alloy superconductor contains said intermetallic compound and is of a composition expressed by chemical composition formula: Mg1-xB2+y where 0<x<1, -2<y<0 and 0<y<2.
[claim3]
3. A method of conducting electrical current as set forth in claim 1, characterized in that said alloy superconductor has a superconducting transition temperature (Tc) of 39 K.
[claim4]
4. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in an inert gas to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim5]
5. A method of conducting electrical current as set forth in claim 4, characterized in that said pellet is heated in said inert gas at a temperature of 700 to 2000 deg. C. for a period of several seconds or more.
[claim6]
6. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in a vacuum to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim7]
7. A method of conducting electrical current as set forth in claim 6, characterized in that said pellet is heated in the vacuum under a pressure of 2 * 10-2 Pa or less at a temperature of 650 to 1100 deg. C. for a period of several minutes or more.
[claim8]
8. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of a pellet,heating said pellet in a pressurized inert gas to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim9]
9. A method of conducting electrical current as set forth in claim 8, characterized in that said pellet is heated in said inert gas under a pressure of 1 to 200 MPa at a temperature of 600 to 1100 deg. C. for a period of several minutes or more.
[claim10]
10. A method of conducting electrical current, comprising the steps of: mixing a Mg containing feedstock powder and a B containing feedstock powder together to form a mixture powder thereof so that the mixture powder contains Mg and B at a compositional ratio of Mg/B=(1-x)/(2+y) where 0<x<1, -2<y<0 and 0<y<2,shaping said mixture powder into the form of pellet,pressing and heating said pellet to form an alloy superconductor,bringing said alloy superconductor to a temperature of 39 K or lower, andpassing electrical current through said alloy superconductor.
[claim11]
11. A method of conducting electrical current as set forth in claim 10, characterized in that said pellet is pressed and heated under a pressure of 0.1 to 6 GPa at a temperature of 700 to 1400 deg. C. for a period of several minutes or more.
  • 発明者/出願人(英語)
  • AKIMITSU JUN
  • ZENITANI YUJI
  • MURANAKA TAKAHIRO
  • NAKAGAWA NORIMASA
  • NAGAMATSU JUN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) CREST Phenomena of Extreme Conditions AREA
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