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<p>Superconducting bulk disks, of 20&#xa0;mm in diameter and ~ 3.5-mm thickness of MgB<sub>2</sub> were prepared by spark plasma sintering. Samples are co-added with 10 wt. % hexagonal BN (h-BN) or graphene (G) and other additives (B<sub>4</sub>C, Te, cubic BN, fullerene C<sub>60</sub>, or Repa-C<sub>6</sub>H<sub>10</sub>O<sub>7</sub>Ge<sub>2</sub> (GEP)), where h-BN and G are introduced in the composite to provide full machinability by chipping of the composite and the other additives to modify microstructure and superconducting characteristics. Measurements of trapped magnetic field <i>B</i><sub>tr</sub> for a fixed rate of the applied magnetic field decrease (0.00015&#xa0;T/s) indicate that samples with G show less flux jumps, but a higher thermomagnetic stability is accompanied by lower values of <i>B</i><sub>tr</sub> than for samples with h-BN. The highest maximum <i>B</i><sub>tr</sub> at 12&#xa0;K for samples added with h-BN or graphene was recorded for MgB<sub>2</sub>(Te)<sub>0.01</sub> + 10wt.% h-BN (3.48&#xa0;T) and MgB<sub>2</sub>(B<sub>4</sub>C)<sub>0.01</sub> + 10wt.% G (2.73&#xa0;T), respectively. These values of maximum trapped field were determined for an applied field of − 2.5 and − 1.8&#xa0;T. Results suggest that machinable MgB<sub>2</sub>-based composites show potential for bulk superconducting magnet applications.</p>

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Trapped Magnetic Field of MgB2 Machinable Disks with Different Additives

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • M. Burdusel,
  • G. V. Aldica,
  • I. Pasuk,
  • M. A. Grigoroscuta,
  • A. Kuncser,
  • P. Badica

摘要

Superconducting bulk disks, of 20 mm in diameter and ~ 3.5-mm thickness of MgB2 were prepared by spark plasma sintering. Samples are co-added with 10 wt. % hexagonal BN (h-BN) or graphene (G) and other additives (B4C, Te, cubic BN, fullerene C60, or Repa-C6H10O7Ge2 (GEP)), where h-BN and G are introduced in the composite to provide full machinability by chipping of the composite and the other additives to modify microstructure and superconducting characteristics. Measurements of trapped magnetic field Btr for a fixed rate of the applied magnetic field decrease (0.00015 T/s) indicate that samples with G show less flux jumps, but a higher thermomagnetic stability is accompanied by lower values of Btr than for samples with h-BN. The highest maximum Btr at 12 K for samples added with h-BN or graphene was recorded for MgB2(Te)0.01 + 10wt.% h-BN (3.48 T) and MgB2(B4C)0.01 + 10wt.% G (2.73 T), respectively. These values of maximum trapped field were determined for an applied field of − 2.5 and − 1.8 T. Results suggest that machinable MgB2-based composites show potential for bulk superconducting magnet applications.