公开(公告)号：US10431823B2

公开(公告)日：2019-10-01

申请号：US15310161

申请日：2015-07-30

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Hiroaki Kumakura ,  Shujun Ye ,  Akira Hasegawa ,  Yoshimi Kubo ,  Eiki Yasukawa ,  Akihiro Nomura

IPC: H01M4/58 ,  B01J23/50 ,  C01B35/04 ,  H01B12/04 ,  H01B13/00 ,  H01M4/48 ,  B01J35/00 ,  B01J35/02 ,  H01M4/36 ,  H01M4/485 ,  H01M4/62 ,  H01M10/0525 ,  B01J37/08 ,  B01J21/18 ,  H01M4/131 ,  H01M4/136 ,  H01M4/1391 ,  H01M4/1397 ,  H01M10/052 ,  C01B32/05 ,  H01M4/02

Abstract: Provided is a method for manufacturing a base material powder having a carbon nanocoating layer, the method including adding a polycyclic aromatic hydrocarbon to a base material powder, heating the mixture to a temperature that is higher than or equal to the boiling point of the polycyclic aromatic hydrocarbon and is lower than or equal to the relevant boiling point temperature+300° C., and that is higher than or equal to the thermal decomposition temperature of the polycyclic aromatic hydrocarbon, and thereby coating the surface of the base material powder with a layer of carbon having a thickness of 0.1 nm to 10 nm. According to the method, when a source of carbon that covers a base material powder is appropriately selected, the base material powder having the carbon nanocoating layer can be provided, which does not have a possibility of causing inconveniences in the applications of a final manufactured product of the base material powder and exhibits satisfactory productivity of the base material powder, and from which a modified final manufactured product is obtained.

公开(公告)号：US09741472B2

公开(公告)日：2017-08-22

申请号：US15105114

申请日：2014-12-16

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Hiroaki Kumakura ,  Akiyoshi Matsumoto ,  Shujun Ye

IPC: H01B12/06 ,  C01B35/04 ,  H01F6/06 ,  H01L39/24 ,  H01B13/00

CPC classification number: H01B12/06 ,  C01B35/04 ,  H01B13/0016 ,  H01B13/0036 ,  H01F6/06 ,  H01L39/2487

Abstract: Provided are a method for manufacturing MgB2 superconductor by pressure molding a mixture of Mg powder or MgH2 powder and B powder and heat-treating the mixture, the method including (I) a step of adding a polycyclic aromatic hydrocarbon to the B powder, while heating the mixture to a temperature higher to or equal to the melting point of the polycyclic aromatic hydrocarbon at the time of this addition, and thereby covering the surface of the B powder with the polycyclic aromatic hydrocarbon; and (II) a step of mixing the B powder having the surface covered with the polycyclic aromatic hydrocarbon, with the Mg powder or the MgH2 powder, or a step of combining the B powder having the surface covered with the polycyclic aromatic hydrocarbon, with an Mg rod; and an MgB2 superconducting wire which has high critical current density (Jc) characteristics and less fluctuation in the critical current density (Jc).