Customized MgB2 Superconducting Wire Toward Practical Applications at Sam Dong in Korea

Choi, Jun Hyuk; Lee, Dong Gun; Jeon, Ju Heum; Lee, Ee Joo; Maeda, Masafumi; Choi, Seyong

doi:10.1007/s10948-018-4814-5

Cited by 22 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present case, J c (6 T) is reduced by 14% for filament sizes of 83 µm and by 31% for 42 µm filaments in wires SD18 and SD 54, respectively. Figure 4(c) compares the engineering current densities (J e ) of SD18 with those of several commercial in situ made wires labelled by the abbreviation for the company and filament number described in table 3 [2][3][4][5][6]. As one can see, comparable in-field engineering current densities are measured for undoped filamentary MgB 2 wires made by different companies.…”

Section: Critical Currents and Current Densitiesmentioning

confidence: 90%

“…All the presented MgB 2 wires were made by the in situ powder-in-tube technique [4] in which a powder mixture of Mg + B is protected by a Nb barrier and sheathed by Monel alloy. The presented Sam Dong wires with different numbers of filaments (named SD6, SD18 and SD54) of diameter 0.83 mm were subjected to twisting, drawing and rolling at room temperature and finally heat treated at a temperature of 660 • C for 30 min (see table 1).…”

Section: Methodsmentioning

confidence: 99%

“…Today's filamentary MgB 2 superconductors are already produced in kilometer-long composite wires by several commercial companies utilizing mostly the in situ powder-in-tube process for production of cold drawn wires with variable filament number and different metallic sheaths [1][2][3][4][5][6]. One such company is Sam Dong Co., Ltd, which initiated the manufacture of MgB 2 superconducting wires in 2015.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of filament number and size on the basic properties of in situ made MgB₂ wires

Kòváč

Berek

Melíšek

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Monel sheathed MgB2 wires with 6, 18 and 54 filaments of diameter 0.83 mm manufactured by Sam Dong Co., Ltd., have been subjected to twisting, drawing and rolling and measured at low temperatures. R(T), I-V characteristics, critical currents, and stress/strain tolerances of these wires were analysed. Low reduction of critical current ( 10%) by twisting between 50 mm and 12.5 mm was observed especially for the wire with 54 filaments, which showed also the best strain tolerance to tension  0.43% at 4.2 K. The engineering current density of 18 filament wire has been decreased by 56 % by drawing from 0.83 mm up to 0.4 mm, but improved by rolling from 0.83 mm to 0.64 mm by ~ 24 %. Therefore, small not insulated coil was made from flattened wire 0.83 mm to 0.64 mm by wind and react process resulting in very high winding packing factor of 0.91 and also high winding current density 104 Acm-2 at B ≤ 5.6 T. Presented properties are interesting for possible applications of these MgB2 wires in DC windings.

show abstract

Section: Critical Currents and Current Densitiesmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of filament number and size on the basic properties of in situ made MgB₂ wires

Kòváč

Berek

Melíšek

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Due to the low cost and wide availability of raw materials, MgB 2 , a binary intermetallic compound, is one of the most promising superconductors for electrical applications, namely sensor [1], energy storage [2], and wire [3]. Hence, MgB 2 and its systems, as well as superconductivity, have been continually developed because of its functional properties such as high Tc of 39 K, weak link free grains, lightweight, and increased coherence [4,5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

et al. 2022

View full text Add to dashboard Cite

MgB2/CNT is a promising candidate for superconducting wire application due to its excellent mechanical properties and carbon nanotube’s low density. However, strong interfacial adhesion between the CNT reinforcement and the MgB2 matrix is difficult to manage. Therefore, this study examines the synthesis and characterization of magnesium diboride (MgB2) superconductors with carbon nanotubes (CNTs) and tin (Sn) addition. Determining the proper method and combination of CNT & Sn affects MgB2 superconductors is crucial. Raw materials of magnesium (Mg), boron (B), Sn, and multi-walled carbon nanotubes (MWCNTs) were used for a solid-state reaction process to determine the proper synthesis method and the effect of CNT on superconductors’ critical temperature. Each sample was obtained by weighing the raw material first, followed by hand grinding with agate mortars for 3 hours. The pelletization was then conducted by using a compact pressing machine with a pressure of 350 MPa. The compacted samples were then sintered at 800 °C for 2 hours either through the vacuum or PIST process. Finally, all were characterized, and MgB2 was discovered to be the dominant phase with minor impurity phases such as MgO, Mg, Mg2Sn, C, and Sn. Based on SEM morphological analysis, the grain boundaries of sample A1 were more precise than B2. In both, the grain size also varies, and the distribution of elements is uneven. Subsequently, Cryogenic Magnet Characterization indicated that at 40 K, almost all samples possess superconducting characteristics. For future studies, the potential impact of MgB2 on critical current density (Jc) and magnetic density (Hc) in several commercial applications such as Magnetic Resonance Imaging (MRI), magnetic levitation, and transformers needs to be investigated

show abstract

“…Alternatively, a continuous form process has been suggested. This review will summarize our research progress on various MgB 2 conductors over the past six years at Sam Dong Co., Ltd. 15,16) , Republic of Korea. In addition, we offer a practical guideline to the users for development of various superconducting devices.…”

Section: Introductionmentioning

confidence: 99%

Overview of MgB<sub>2</sub> wires fabricated by Sam Dong Co., Ltd.

Hyuk¹,

Gun²

2021

TEION KOGAKU

View full text Add to dashboard Cite

Customized MgB2 Superconducting Wire Toward Practical Applications at Sam Dong in Korea

Cited by 22 publications

References 27 publications

Influence of filament number and size on the basic properties of in situ made MgB₂ wires

Influence of filament number and size on the basic properties of in situ made MgB₂ wires

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

Overview of MgB<sub>2</sub> wires fabricated by Sam Dong Co., Ltd.

Contact Info

Product

Resources

About

Customized MgB2 Superconducting Wire Toward Practical Applications at Sam Dong in Korea

Cited by 22 publications

References 27 publications

Influence of filament number and size on the basic properties of in situ made MgB2 wires

Influence of filament number and size on the basic properties of in situ made MgB2 wires

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

Overview of MgB<sub>2</sub> wires fabricated by Sam Dong Co., Ltd.

Contact Info

Product

Resources

About

Influence of filament number and size on the basic properties of in situ made MgB₂ wires

Influence of filament number and size on the basic properties of in situ made MgB₂ wires