Fabrication and Transport Properties of&amp;lt;tex&amp;gt;$rm MgB_2$&amp;lt;/tex&amp;gt;Mono-Core Wire and Solenoid Coil

Tanaka, Kazuhide; Kitaguchi, Hitoshi; Kumakura, Hiroaki; Hirakawa, M.; Yamada, Hideyuki; Okada, Minoru

doi:10.1109/tasc.2005.848778

Cited by 23 publications

(20 citation statements)

References 11 publications

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“…In order to evaluate the potentiality for power applications, the development of a wire processing technique is essential. Recent efforts at wire fabrication have mostly centred on developing the powder-in-tube (PIT) process [2][3][4] due to the greater ease of scaling up production [5]. However, the PIT process is based on a powder sintering process, and therefore has extreme difficulty in achieving dense structure and avoiding void formation.…”

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confidence: 99%

An interface diffusion process approach for the fabrication of MgB₂wire

Togano¹,

Nakane²,

Fujii³

et al. 2006

Supercond. Sci. Technol.

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We propose a new approach for the fabrication of MgB 2 tape utilizing an interface diffusion reaction between an Fe-Mg alloy substrate and a boron (B) layer. The Fe-Mg alloy has enough workability to be deformable into a tape form, and the Fe-Mg/(B(+SiC)) composites were prepared by a lamination method. During the heat treatment at 700 • C, the Mg in the Fe-Mg alloy diffuses towards the interface, forming a thin Mg rich layer along the interface. The Mg rich thin layer acts as a source of Mg for MgB 2 formation, which proceeds to the inside of the B layer. Such a formation mechanism produces a dense structure of MgB 2 with much less MgO impurity, which is difficult to achieve by the conventional powder-in-tube (PIT) process. SiC addition to the B layer is effective for improving the critical current density J c in applied magnetic fields as in the case of the PIT process, and a J c value of 3 × 10 4 A cm −2 at 5 K and 7 T has been obtained, which is comparable to that of PIT tape with SiC addition. This approach is expected to be a breakthrough in the development of MgB 2 wire with a high quality superconducting layer in the composite.

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confidence: 99%

An interface diffusion process approach for the fabrication of MgB₂wire

Togano¹,

Nakane²,

Fujii³

et al. 2006

Supercond. Sci. Technol.

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“…2 shows the magnetic field dependence of and -value of the wires. The of the wires reached 2300 in a magnetic field of 3.0 T and showed characteristics as good as other wires [3]. However, the -value of the wires was lower than those of NbTi and wires [19].…”

Section: Introductionmentioning

confidence: 82%

“…The advantages of are not only a high transition temperature but also low cost and weight [2]. Therefore, the increasing interest in the conductor for future applications at temperatures between 4.2 K and 20 K employing refrigeration machine is the consequence of its steadily improving transport current carrying capability [3]. For many groups, the powder-in-tube (PIT) method was preferred early on to produce wires and tapes.…”

Section: Introductionmentioning

confidence: 99%

“…For example, fabricating long wires with high , and good homogeneity of distribution, and fabricating some superconducting joints between and other superconductors are thought to be major issues. We have been studying how to fabricate a coil that generates a high magnetic field [3]. However, there has been little research on the coil in persistent current mode (PC mode) operation.…”

Section: Introductionmentioning

confidence: 99%

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Relaxation of Trapped High Magnetic Field in 100 m-long Class<tex>$rm MgB_2$</tex>Solenoid Coil in Persistent Current Mode Operation

Takahashi

Tanaka²,

Okada³

et al. 2006

IEEE Trans. Appl. Supercond.

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This paper reports on the relaxation of trapped magnetic field in a MgB 2 solenoid coil in PC mode operation. For PC mode operation, we fabricated a closed loop circuit with a MgB 2 coil, a PCS and some superconducting joints. The MgB 2 coil was fabricated employing a 100 m-long PIT processed MgB 2 wire using a wind & react method. The critical current of the coil reached 166 A and the coil was able to generate a maximum magnetic field of about 2.5 T at 4.2 K without an external field. The PCS was fabricated employing a long NbTi wire stabilized Cu-Ni alloy. The joints were fabricated between MgB 2 and NbTi conductor, between NbTi (PCS) and NbTi conductor. The resistance of all fabricated joints was estimated to be less than 1 0 10 13 . In PC mode operation with the closed loop circuit, a magnetic field of 1.46 T was trapped for about 50000 s (above 12 hr.) without any detectable decay. These results demonstrate the possible use of the MgB 2 superconductor for applications such as MRI superconducting magnet.Index Terms-MgB 2 , persistent current mode operation, superconducting joint, trapped magnetic field.

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“…The main processing technologies for the MgB 2 wires and tapes are a variance of the Powders in Tube (PIT) and are performed either via "in situ" or "ex situ" mode [1][2][3][4][5][6][7][8]. increase the thermal stabilization of the wire and improve the transport properties in magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Superconducting characteristics of MgB2 wires obtained by Reactive Liquid Mg Infiltration

et al. 2006

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Superconducting MgB 2 wires, of different diameter and length, have been produced by the Reactive Liquid Mg Infiltration (RLI) process, also implemented with the addition of extra Mg, to completely fill the internal hole created from the normal infiltration process. The actual wires have an Iron external lining and the metallic Mg internally added has a twofold effect: to avoid Mg deficiency during the reaction and to increase the quenching resistance of the wire. The superconducting characteristics of the wires have been measured either at the liquid He and at the liquid Ne temperatures, on small samples cut from meter long wires. The typical critical current density in self field, at 27.1 K, is about 1000 A/mm 2 , a value of interest for many power applications. The extension of the manufacturing process to longer wire will be discussed as well as the effect of the metallic lining of the wires on the contact resistance and on the current injection length.

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Fabrication and Transport Properties of<tex>$rm MgB_2$</tex>Mono-Core Wire and Solenoid Coil

Cited by 23 publications

References 11 publications

An interface diffusion process approach for the fabrication of MgB₂wire

An interface diffusion process approach for the fabrication of MgB₂wire

Relaxation of Trapped High Magnetic Field in 100 m-long Class<tex>$rm MgB_2$</tex>Solenoid Coil in Persistent Current Mode Operation

Superconducting characteristics of MgB2 wires obtained by Reactive Liquid Mg Infiltration

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Fabrication and Transport Properties of&lt;tex&gt;$rm MgB_2$&lt;/tex&gt;Mono-Core Wire and Solenoid Coil

Cited by 23 publications

References 11 publications

An interface diffusion process approach for the fabrication of MgB2wire

An interface diffusion process approach for the fabrication of MgB2wire

Relaxation of Trapped High Magnetic Field in 100 m-long Class<tex>$rm MgB_2$</tex>Solenoid Coil in Persistent Current Mode Operation

Superconducting characteristics of MgB2 wires obtained by Reactive Liquid Mg Infiltration

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Fabrication and Transport Properties of<tex>$rm MgB_2$</tex>Mono-Core Wire and Solenoid Coil

An interface diffusion process approach for the fabrication of MgB₂wire

An interface diffusion process approach for the fabrication of MgB₂wire