Pinning of planar vortices in a three-dimensional Josephson medium and the applicability of the Bean model

1997 ◽  
Vol 23 (6) ◽  
pp. 443-444
Author(s):  
M. A. Zelikman
Keyword(s):  
Three Dimensional ◽  
Bean Model ◽  
Josephson Medium

Microstructure and Superconductive Property of MgB2/Al Composite Materials

2012 ◽  
Vol 706-709 ◽  
pp. 667-670
Author(s):  
Manabu Mizutani ◽  
Daisuke Tokai ◽  
Kenji Matsuda ◽  
Katsuhiko Nishimura ◽  
Tokimasa Kawabata ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Magnetic Hysteresis ◽  
Three Dimensional ◽  
Original Method ◽  
Superconducting Transition ◽  
Bean Model ◽  
Al Composite ◽  
The Matrix ◽  
Better Than

MgB2has the higher critical temperature of superconducting transition (TC: 39K) among the intermetallic compound superconductive materials, however, MgB2is hard for practical use because of its unworkable and lower critical current density (JC) in a high magnetic field than Nb-based superconductive materials. We have developed the original method of three-dimensional penetration casting (3DPC) to fabricate the MgB2/Al composite materials. In the composite material we made, MgB2particles dispersed to the matrix uniformly. Thus, these composite materials can be processed by machining, extrusion and rolling. TheTCwas determined by electrical resistivity and magnetization to be about 37～39K. In this work, we made composite material with ground MgB2particle with the purpose of extruding thinner wires of composite material, successfully produced φ1mm wire and changed the matrix from pure Al to Al-In alloy.JCof composite materials with the matrix of Al-In alloy was calculated from the width of the magnetic hysteresis based on the extended Bean model. The result was better than that of MgB2/Al composite material without Indium. Microstructures of these samples had been confirmed by SEM observation.

Microstructure and Superconductive Property of MgB2/Al Composite Materials

2011 ◽  
Vol 409 ◽  
pp. 201-204
Author(s):  
Manabu Mizutani ◽  
Daisuke Tokai ◽  
Kenji Matsuda ◽  
Katsuhiko Nishimura ◽  
Tokimasa Kawabata ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Magnetic Hysteresis ◽  
Three Dimensional ◽  
Original Method ◽  
Superconducting Transition ◽  
Bean Model ◽  
Al Composite ◽  
The Matrix ◽  
Better Than

MgB2has the higher critical temperature of superconducting transition (TC: 39K) among the intermetallic compound superconductive materials, however, MgB2is hard for practical use because of its unworkable and lower critical current density (JC) in a high magnetic field than Nb-based superconductive materials. We have developed the original method of three-dimensional penetration casting (3DPC) to fabricate the MgB2/Al composite materials. In the composite material we made, MgB2particles dispersed to the matrix uniformly. Thus, these composite materials can be processed by machining, extrusion and rolling. TheTCwas determined by electrical resistivity and magnetization to be about 37～39K. In this work, we made composite material with ground MgB2particle with the purpose of extruding thinner wires of composite material, successfully produced φ1mm wire and changed the matrix from pure Al to Al-In alloy.JCof composite materials with the matrix of Al-In alloy was calculated from the width of the magnetic hysteresis based on the extended Bean model. The result was better than that of MgB2/Al composite material without Indium. Microstructures of these samples had been confirmed by SEM observation.

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