Studies of upgrading of its performance and magnetization technique of Ag-bearing Sm123-type superconducting permanent magnet materials

本工作旨在开发c轴取向的大型Sm123体超导体，并构建一个能够在开放空间产生超过2特斯拉的磁场的面对面磁场发生器，这大约是普通Nd-Fe-B磁铁产生磁场的10倍。(1) 1999年，我们研制出了直径为36 mm的含ag Sm123超导体，利用电冰箱冷却30 K的脉冲场，在其表面获得了3.8特斯拉的最大捕获场。在30 ~ 77 K的脉冲场作用下，我们成功地分析了sm123超导体中量子化磁通量的运动。(2)对含ag的Sm123超导体表面施加6.7特斯拉的静磁场。利用这个强磁场，我们可以对尺寸为50x50x0.5 mm的Nd-Fe-B板进行磁场扫描，使其完全磁化。这是1999年11月18日《长春报》报道的。(3) 2000年，我们通过安装两个几乎相同的直径为36毫米的含银Sml23超导体，用冰箱冷却到35 K，构建了一个面对面的磁场发生器。这两个超导体被脉冲磁场磁化。在这两种超导体夹心的2mm气隙中获得了2.8特斯拉的捕获场。这是2000年1月24日《日经-京报》报道的。这标志着我们开启了在开放空间使用超过2特斯拉的强磁场的新时代。(4) 2002年1月，成功合成了直径60 mm的含银sm123超导体。将这两个大型超导体安装到磁场发生器中，可以在5mm的气隙中产生3.0特斯拉的磁场，进一步加强了我们关于利用具有高捕获场性能的大型块状超导体获得超过2特斯拉的超强磁场的建议。少

The present work aims at developing c-axis oriented large Sm123 bulk superconductors and constructing a face-to-face-type magnetic field generator capable of producing magnetic field of more than 2 Tesla in open space, which is roughly 10 times larger than the magnetic field produced by ordinary Nd-Fe-B magnet.( 1 ) In 1999, we could develop Ag-bearing Sm123 superconductors with 36 mm in diameter and achieved a maximum trapped field of 3.8 Tesla on its surface by pulsed field at 30 K cooled by the refrigerator. We could successfully analyze the motion of quantized magnetic fluxes penetrated into the Sm123-superconductor upon the operation of a pulsed field at temperatures 30-77 K.( 2 ) The Ag-bearing Sm123 superconductor was also magnetized by static field up to 6.7 Tesla on its surface. By utilizing this strong field, we could fully magnetize the Nd-Fe-B plate with the dimension 50x50x0.5 mm by scanning it over the magnetic field thus produced. This was reported in Chunichi Newspaper … More on November 18, 1999.( 3 ) In 2000, we constructed a face-to-face-type magnetic field generator by mounting two almost identical Ag-bearing Sml23 superconductors with 36 mm in diameter, which were cooled to 35 K by a refrigerator. These two superconductors were magnetized by pulsed field. The trapped field of 2.8 Tesla was obtained in the air gap of 2mm sandwiched by these two superconductors. This was reported in Nikkan-Kogyo Newspaper on January 24, 2000. This demonstrated the opening of a new era in which we can use strong magnetic field exceeding 2 Tesla in open space.( 4 ) In January 2002, the Ag-bearing Sm 123 superconductor with the diameter of 60 mm was successfully synthesized. The installation of these two large superconductors into the field generator could produce the magnetic field of 3.0 Tesla in the air gap of 5mm, further strengthening our proposal concerning the availability ofa very strong magnetic field exceeding 2 Tesla by using the large bulk superconductors with a high trapped field performance. Less