Drastic Improvement in Mechanical Properties of DI-BSCCO Wire With Novel Lamination Material

Nakashima, T.; Yamazaki, Kohei; Kobayashi, Shinichi; Kagiyama, Tomohiro; Kikuchi, Masashi; Takeda, Souichirou; Osabe, Goro; Fujikami, J.; Osamura, Kōzō

doi:10.1109/tasc.2014.2385873

Cited by 40 publications

(35 citation statements)

References 11 publications

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“…Attractive properties [54, 55], promising findings from other evaluations [48, 56, 57], and early suggestions of even higher strain limits in bending (allowable bending diameters between 20 and 30 mm [55] and unexpected-high load-performance under hoop stress [57]) triggered us to perform a systematic feasibility study on the suitability of DI-BSCCO HT-NX material for very high-field solenoids.…”

Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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We performed a feasibility study on a high-strength Bi2−xPbxSr2Ca2Cu3O10−x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.

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Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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“…Recently, stronger Bi-2223 conductors with a tensile strength of 450-500 MPa have been developed [39]. It is probable that an ultra-compact type super-high field NMR magnet might be similarly achieved using this new type of Bi-2223 conductors.…”

Section: Size Of a Magnetmentioning

confidence: 99%

Operation of a 400 MHz NMR magnet using a (RE:Rare Earth)Ba2Cu3O7− high-temperature superconducting coil: Towards an ultra-compact super-high field NMR spectrometer operated beyond 1 GHz

Yanagisawa

Piao

Iguchi

et al. 2014

Journal of Magnetic Resonance

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High-temperature superconductors (HTS) are the key technology to achieve super-high magnetic field nuclear magnetic resonance (NMR) spectrometers with an operating frequency far beyond 1GHz (23.5T). (RE)BaCuO (REBCO, RE: rare earth) conductors have an advantage over BiSrCaCuO (Bi-2223) and BiSrCaCuO (Bi-2212) conductors in that they have very high tensile strengths and tolerate strong electromagnetic hoop stress, thereby having the potential to act as an ultra-compact super-high field NMR magnet. As a first step, we developed the world's first NMR magnet comprising an inner REBCO coil and outer low-temperature superconducting (LTS) coils. The magnet was successfully charged without degradation and mainly operated at 400MHz (9.39T). Technical problems for the NMR magnet due to screening current in the REBCO coil were clarified and solved as follows: (i) A remarkable temporal drift of the central magnetic field was suppressed by a current sweep reversal method utilizing ∼10% of the peak current. (ii) A Z2 field error harmonic of the main coil cannot be compensated by an outer correction coil and therefore an additional ferromagnetic shim was used. (iii) Large tesseral harmonics emerged that could not be corrected by cryoshim coils. Due to those harmonics, the resolution and sensitivity of NMR spectra are ten-fold lower than those for a conventional LTS NMR magnet. As a result, a HSQC spectrum could be achieved for a protein sample, while a NOESY spectrum could not be obtained. An ultra-compact 1.2GHz NMR magnet could be realized if we effectively take advantage of REBCO conductors, although this will require further research to suppress the effect of the screening current.

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“…The long length availability and high field performance, aided by the lamination reinforcement [25], encouraged development of several prototype magnets such as a 1.03 GHz NMR magnet [26] and a 3 T MRI magnet operated at 20 K by a cryocooler [27]. The new Ni-alloy laminated conductor (HT-XX) has a tensile stress tolerance of over 500 MPa at 77 K [14] and it has become commercially available very recently. Other types of laminated conductors available [4] are conductors with Cu-alloy (HT-CA), and stainless steel (HT-SS) laminations and their relevant dimensions are summarized in Table 2.…”

Section: Bi-2223mentioning

confidence: 99%

“…Owing to some unresolved technical issues of coated conductors such as weak transverse stress tolerance [11] and strong effect of field screening [12,13], there are also renewed interests in Bi-2223 (Bi 2 -Sr 2 -Ca 2 -Cu 3 -O x ) conductors, powder-in-tube multifilamentary wires rolled into tape form, especially following the recent improvement in mechanical strength by laminations with high strength alloys [14].…”

Section: Introductionmentioning

confidence: 99%