Magnetization Process of High-Tc Superconductors due to Pulsed Field and Development of Superconducting Permanent Magnet

脉冲场高温超导体磁化过程及超导永磁体的发展

• 批准号: 09305041
• 负责人: MIZUTANI Uichiro
• 金额: $ 19.84万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305041/
• 关键词: Pulsed Magunetization Technique; High-T_c Superconducting Bulk Magnet; Pulsed Field; melt-processing; Pinning Mechanism; Superconducting Permanent Magnet

The c-axis oriented REBa_2Cu_3O_<7*> quasi-single crystal grown by the melt-processing with the use of a seed crystal is known to capture magnetic fields of the order of 1 Tesla at 77 K and to enhance its capability by lowering the temperature. We believe that the trapping field ability of a superconducting permanent magnet can be further enhanced to the level more than 10 times as high as that of the ordinary Nd-Fe-B permanent magnet, if its microstructure is well controlled. The objective of the present work is to develop superconducting permanent magnetic materials generating 3-5 Tesla in the free space and to develop the pulsed field magnetization technique to magnetize the synthesized superconductor.In 1997, we synthesized the melt-processed bulk superconductors and analyzed the dynamical motion of the magnetic fluxes in the superconductor driven by the pulsed field. We observed the magnetization curve different from that obtained under the static field. When the pulsed field is l … More ow, the magnetic fluxes enter into the superconductor very slowly but begin to enter very rapidly once the intensity of the pulsed field exceeds 2-4 Tesla. We obtained crucial information about the viscous motion of the magnetic fluxes and pinning mechanism in the presence of the pulsed field. We could also successfully synthesized the Y-123, Sm-123 and Nd-123 quasi-single crystal by dispersing the 211 particles in the matrix uniformly.In 1998, We could enhance both superconducting and mechanical properties of the Sm-123 bulk superconductor by dispersing fine Ag particles in the matrix and could trap magnetic field of 1.7 Tesla at 77 K.The value could be increased to 9 Tesla at 25 K.All these data for the Sm-123 superconductors synthesized without any assistance of irradiation are the highest reported in the literature. This is 30 times as high as that of the Nd-Fe-B permanent magnet (reported in Chunichi-Shinbun, evening newspaper, March 27th, Heisei 10) . The research to magnetize this superconductor by the pulsed field has been also conducted. We have concluded that a magnetic field generator producing 3-5 Tesla in free space will be developed in very near future. Less

用籽晶法生长的c轴取向REBa_2Cu_3O_（7*）准单晶在77 K时能捕获1 T量级的磁场，并能通过降低温度来提高其性能。我们认为，如果能很好地控制超导永磁体的微观结构，超导永磁体的俘获场能力可以进一步提高到普通Nd-Fe-B永磁体的10倍以上。为了研制在自由空间产生3-5特斯拉的超导永磁材料，并发展脉冲磁场磁化技术，我们于1997年合成了熔体加工的超导块材，并分析了脉冲磁场驱动下超导体中磁通的动力学运动。我们观察到的磁化曲线与静态磁场下得到的不同。当脉冲场为l ...更多信息 现在，磁通量非常缓慢地进入超导体，但是一旦脉冲场的强度超过2-4特斯拉，则开始非常快速地进入。我们获得了关于在脉冲场存在下磁通量的粘性运动和钉扎机制的重要信息。我们还成功地合成了Y-123、Sm-123和Nd-123准单晶，211粒子均匀地分散在基体中。我们可以同时提高Sm的超导性能和机械性能。123块体超导体，在77 K时可捕获1.7 T的磁场，在室温下可将其捕获磁场的值提高到9所有这些数据的Sm-123超导体合成没有任何援助的辐射是最高的文献报道。这是Nd-Fe-B永磁体的30倍（3月27日平成10日《中日新闻》晚报报道）。并进行了脉冲磁场磁化该超导体的研究。我们得出的结论是，在自由空间产生3-5特斯拉的磁场发生器将在不久的将来开发。少

项目成果

Uichiro Mizutani, A.Mase, H.Ikuta, Y.Yanagi, M.Yoshikawa, Y.Itoh and T.Oka: "Synthesis of c-axis oriented single-domain Sm 123 superconductors capable trapping 9 Tesla at 25 K and its application to a strong magnetic field" Materials Science and Engineeri

Uichiro Mizutani、A.Mase、H.Ikuta、Y.Yanagi、M.Yoshikawa、Y.Itoh 和 T.Oka：“能够在 25 K 捕获 9 Tesla 的 c 轴取向单畴 Sm 123 超导体的合成及其应用

生田 博志: "高温超伝導溶融バルク材料開発の現状" 応用物理学会誌. 4月号(掲載予定). (1999)

生田博：“高温超导熔融块体材料的发展现状”，日本应用物理学会杂志4月号（待出版）。

H.Ikuta: "Melt-pnocessed Sm-Ba-Cu-D superconductors trapping strong maginetic field" Superconductor Science and Technology. vol.11. 1345-1347 (1998)

H.Ikuta：“捕获强磁场的熔融加工Sm-Ba-Cu-D超导体”超导科学与技术。

H.Ikuta, A.Mase, Y.Yanagi, M.Yoshikawa, Y.Itoh, T.Oka and U.Mizutani: "Melt-processed Sm-Ba-Cu-superconductors trapping strong magnetic" Superconductor Science and echnology. vol.11. 1345-1347 (1998)

H.Ikuta、A.Mase、Y.Yanagi、M.Yoshikawa、Y.Itoh、T.Oka 和 U.Mizutani：“捕获强磁性的熔融加工 Sm-Ba-Cu 超导体”超导科学与技术。

A.Mase: "Preperation of large C-axis oriented melt-prouessed Sm-Ba-Cu-O and their supercon ducting properties" Proc.of 10th International Symposium on Superconductivity (Oct,1997,Gifu). (1997)

A.Mase：“大型C轴取向熔体加工Sm-Ba-Cu-O的制备及其超导性能”第10届国际超导研讨会论文集（1997年10月，岐阜）。