A trapped field of &gt;3 T in bulk MgB<sub>2</sub>fabricated by uniaxial hot pressing

Durrell, John; Dancer, Claire E. J.; Dennis, Anthony; Shi, Yan; Xu, Zhanwei; Campbell, A.M.; Babu, N. Hari; Todd, Richard I.; Grovenor, C.R.M.; Cardwell, D. A.

doi:10.1088/0953-2048/25/11/112002

Cited by 98 publications

(52 citation statements)

References 30 publications

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“…This infiltration process does not require an external pressure to be applied to the reacting material and still produces highly dense final products [7]. It has been shown that MgB 2 bulk magnets could be used at 20 K [8][9][10][11]. High critical current density (J c ) and good homogeneity are essential for high trapped field magnets.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the fabrication process for high trapped field MgB2 bulks

Muralidhar

Ishihara

Suzuki

et al. 2013

Physica C: Superconductivity

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Section: Introductionmentioning

confidence: 99%

Optimization of the fabrication process for high trapped field MgB2 bulks

Muralidhar

Ishihara

Suzuki

et al. 2013

Physica C: Superconductivity

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“…The typical trapped field in bulk superconductors (> 3 T in bulk MgB 2 [1][2][3][4] or > 17 T in bulk (RE)Ba 2 Cu 3 O 7 large grain materials [5,6]) is well beyond the saturation magnetization of conventional ferromagnets. This makes them extremely promising as a competing technology for traditional permanent magnets in various applications [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of soft ferromagnetic sections on the magnetic flux density profile of a large grain, bulk Y–Ba–Cu–O superconductor

Philippe

Ainslie

Wera

et al. 2015

Supercond. Sci. Technol.

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Bulk, high temperature superconductors have significant potential for use as powerful permanent magnets in a variety of practical applications due to their ability to trap record magnetic fields. In this paper, soft ferromagnetic sections are combined with a bulk, large grain Y-Ba-Cu-O (YBCO) high temperature superconductor to form superconductor/ferromagnet (SC/FM) hybrid structures. We study how the ferromagnetic sections influence the shape of the profile of the trapped magnetic induction at the surface of each structure and report the surface magnetic flux density measured by Hall probe mapping. These configurations have been modelled using a 2D axisymmetric finite element method based on the H-formulation and the results show excellent qualitative and quantitative agreement with the experimental measurements. The model has also been used to study the magnetic flux distribution and predict the behaviour for other constitutive laws and geometries. The results show that the ferromagnetic material acts as a magnetic shield, but the flux density and its gradient are enhanced on the face opposite to the ferromagnet. The thickness and saturation magnetization of the ferromagnetic material are important and a characteristic ferromagnet thickness d* is derived: below d*, saturation of the ferromagnet occurs, and above d*, a weak thicknessdependence is observed. The influence of the ferromagnet is observed even if its saturation magnetization is lower than the trapped flux density of the superconductor. Conversely, thin ferromagnetic discs can be driven to full saturation even though the outer magnetic field is much smaller than their saturation magnetization. [5,6]) is well beyond the saturation magnetization of conventional ferromagnets. This makes them extremely promising as a competing technology for traditional permanent magnets in various applications [7][8][9][10]. The combination of ferromagnetic and superconducting materials can enhance the performance of the superconductor [11,12] and even lead to new applications [13]. Large grain, bulk superconductors are often used in applications that incorporate ferromagnetic materials, such as in motors and generators [14,15]. Ferromagnets can also increase the force in levitation systems [16,17] and close the magnetic circuit, which improves the available flux produced by bulk superconductors [18]. Similarly, ferromagnetic materials are used as sheaths around multifilament wires and tapes [19,20] or as magnetic flux diverters to modify the flux distribution around tapes and superconducting coil magnets [21][22][23][24][25][26][27][28]; thereby improving their electrical properties (i.e. increasing the critical current and reducing AC losses).

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“…The intermetallic material is more attractive for the next generation of superconducting applications because of the lack of weak-links at the grain boundaries and a high critical transition temperature of 39 K as compared to the conventional NbTi. The superconducting transition temperature of MgB2 is significantly lower than that of YBa2Cu3Oy "Y-123", instead, MgB2 benefits of a high critical current density (Jc) in the polycrystalline state, which makes these materials promising candidates for several industrial applications including the next generation of super-magnets for medical devices, electrical power system, transportation and powerful super-magnets operating at around 20 K [3][4][5][6][7][8][9]. For superconducting super-magnet applications, it is required to produce good quality, low cost MgB2 material with high Jc and an acceptable mechanical performance.…”

Section: Introductionmentioning

confidence: 99%