Copper sheath MgB2 wires fabricated by an in situ PIT method

S. Shimura; T. Machi; M. Murakami; N. Koshizuka; K. Mochizuki; I. Ishikawa; N. Shibata

doi:10.1016/j.physc.2004.02.222

Copper sheath MgB₂ wires fabricated by an in situ PIT method

S. Shimura, T. Machi, M. Murakami, N. Koshizuka, K. Mochizuki, I. Ishikawa, N. Shibata

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We investigated the applicability of Cu as sheath materials for MgB ₂ wires prepared by in situ PIT (powder-in-tube) method in comparison with stainless steal. Since the critical current density of MgB₂ increases with TiH₂ doping, we prepared TiH₂ doped MgB₂ Cu sheath wires 40 m in length and ∅ 1.0 mm or 0.5×1.0 mm² in cross section by rotary swaging, drawing, and two-axial rolling under cold working. We then annealed the samples at 600-850 °C for 1-2 h in Ar gas atmosphere. The critical current of TiH₂ (6%) doped MgB₂/Cu short sample annealed at 650 °C reached 208 A (J_c=230 kA/cm²) at 4.2 K and self-field. We also fabricated several coils using these wires. The I_c value was ∼100 A at 4.2 K for a coil prepared with use of a 5 m length wire. These results suggest that it is possible to fabricate Cu sheathed MgB₂ wires with good performance by using the in situ PIT method.

Original language	English
Pages (from-to)	1179-1183
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	412-414
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2004.02.222
Publication status	Published - 2004 Oct

Keywords

Copper sheath
Critical current
In situ
MgB wire
Powder-in-tube

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2004.02.222

Cite this

@article{19e9b1d36f29487fa2118d3a9aadc7f5,

title = "Copper sheath MgB2 wires fabricated by an in situ PIT method",

abstract = "We investigated the applicability of Cu as sheath materials for MgB 2 wires prepared by in situ PIT (powder-in-tube) method in comparison with stainless steal. Since the critical current density of MgB2 increases with TiH2 doping, we prepared TiH2 doped MgB2 Cu sheath wires 40 m in length and ∅ 1.0 mm or 0.5×1.0 mm2 in cross section by rotary swaging, drawing, and two-axial rolling under cold working. We then annealed the samples at 600-850 °C for 1-2 h in Ar gas atmosphere. The critical current of TiH2 (6%) doped MgB2/Cu short sample annealed at 650 °C reached 208 A (Jc=230 kA/cm2) at 4.2 K and self-field. We also fabricated several coils using these wires. The Ic value was ∼100 A at 4.2 K for a coil prepared with use of a 5 m length wire. These results suggest that it is possible to fabricate Cu sheathed MgB2 wires with good performance by using the in situ PIT method.",

keywords = "Copper sheath, Critical current, In situ, MgB wire, Powder-in-tube",

author = "S. Shimura and T. Machi and M. Murakami and N. Koshizuka and K. Mochizuki and I. Ishikawa and N. Shibata",

note = "Funding Information: This work was supported by JST (Japan Science and Technology Corporation).",

year = "2004",

month = oct,

doi = "10.1016/j.physc.2004.02.222",

language = "English",

volume = "412-414",

pages = "1179--1183",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "SPEC. ISS.",

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TY - JOUR

T1 - Copper sheath MgB2 wires fabricated by an in situ PIT method

AU - Shimura, S.

AU - Machi, T.

AU - Murakami, M.

AU - Koshizuka, N.

AU - Mochizuki, K.

AU - Ishikawa, I.

AU - Shibata, N.

N1 - Funding Information: This work was supported by JST (Japan Science and Technology Corporation).

PY - 2004/10

Y1 - 2004/10

N2 - We investigated the applicability of Cu as sheath materials for MgB 2 wires prepared by in situ PIT (powder-in-tube) method in comparison with stainless steal. Since the critical current density of MgB2 increases with TiH2 doping, we prepared TiH2 doped MgB2 Cu sheath wires 40 m in length and ∅ 1.0 mm or 0.5×1.0 mm2 in cross section by rotary swaging, drawing, and two-axial rolling under cold working. We then annealed the samples at 600-850 °C for 1-2 h in Ar gas atmosphere. The critical current of TiH2 (6%) doped MgB2/Cu short sample annealed at 650 °C reached 208 A (Jc=230 kA/cm2) at 4.2 K and self-field. We also fabricated several coils using these wires. The Ic value was ∼100 A at 4.2 K for a coil prepared with use of a 5 m length wire. These results suggest that it is possible to fabricate Cu sheathed MgB2 wires with good performance by using the in situ PIT method.

AB - We investigated the applicability of Cu as sheath materials for MgB 2 wires prepared by in situ PIT (powder-in-tube) method in comparison with stainless steal. Since the critical current density of MgB2 increases with TiH2 doping, we prepared TiH2 doped MgB2 Cu sheath wires 40 m in length and ∅ 1.0 mm or 0.5×1.0 mm2 in cross section by rotary swaging, drawing, and two-axial rolling under cold working. We then annealed the samples at 600-850 °C for 1-2 h in Ar gas atmosphere. The critical current of TiH2 (6%) doped MgB2/Cu short sample annealed at 650 °C reached 208 A (Jc=230 kA/cm2) at 4.2 K and self-field. We also fabricated several coils using these wires. The Ic value was ∼100 A at 4.2 K for a coil prepared with use of a 5 m length wire. These results suggest that it is possible to fabricate Cu sheathed MgB2 wires with good performance by using the in situ PIT method.

KW - Copper sheath

KW - Critical current

KW - In situ

KW - MgB wire

KW - Powder-in-tube

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