公开(公告)号：US20140024533A1

公开(公告)日：2014-01-23

申请号：US13748027

申请日：2013-01-23

申请人： The University of Tokyo ,  Hitachi, Ltd.

发明人： Motomune KODAMA ,  Kazuhide TANAKA ,  Junichi SHIMOYAMA ,  Akiyasu YAMAMOTO

IPC分类号： H01L39/12 ,  H01L39/24

CPC分类号： H01L39/125 ,  C01B35/04 ,  H01L39/141 ,  H01L39/2487 ,  Y10T428/12181

摘要： An MgB2 superconducting wire excellent in critical current density property is supplied by using a crystalline boron powder which is low in costs and easy to obtain. For the wire, a precursor of the MgB2 superconducting wire is used, the precursor having a linear structure including a core region containing a magnesium powder and a boron powder, and a sheath region formed of a metal covering an outer circumferential portion of the core region. The boron powder is crystalline, and has a volume-mean particle size of 2 μm or less.

摘要翻译： 通过使用低成本且易于获得的结晶性硼粉末来提供临界电流密度特性优异的MgB 2超导线材。 对于导线，使用MgB 2超导线的前体，该前体具有包括含有镁粉末和硼粉末的核心区域的线性结构，以及由覆盖芯部区域的外周部分的金属形成的护套区域 。 硼粉是结晶的，体积平均粒径为2μm以下。

公开(公告)号：US20190385766A1

公开(公告)日：2019-12-19

申请号：US16479274

申请日：2018-02-26

申请人： HITACHI, LTD.

发明人： Motomune KODAMA ,  Hideki TANAKA ,  Takaaki SUZUKI ,  Junichi SHIMOYAMA

IPC分类号： H01B12/02 ,  C01B35/04

摘要： The following two problems arise when carbon is added to a starting material powder in the process of production of an MgB2 superconductor: (1) an impurity phase increases; and (2) the degree of substitution of carbon at boron sites is spatially non-uniform. This superconductor production method comprises: a mixing step of mixing a starting material powder and an additive; and a heat treatment step of heat-treating the mixture prepared in the mixing step. The starting material powder is MgB2 powder or a mixed powder of magnesium and boron, and the additive is an Mg—B—C compound containing three elements of magnesium, boron and carbon.