Preparation of high Tc superconducting wire by precursor spinning method.

前驱体纺丝法制备高Tc超导线材

• 批准号: 07555490
• 负责人: GOTO Tomoko
• 金额: $ 2.69万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555490/
• 关键词: High T_c superconductor; filamentary; solution spinning; precursor filament; Y123; Nd123; critical current density; composite; Nd123高温超伝導体; 低酸素圧下での溶融凝固処理; Y123高温超伝導体; 部分溶融凝固処理; 組織変化; 高温酸化物超伝導体; 線材化; 溶液紡糸法; 前駆体繊維; 長尺化; 臨界電流密度

For practical application of high T_c superconducting magnet at 77K,the superconducting wire with high J_c at high magnetic field is needed. We have studied the preparation of the filamentary superconducting oxide using a textile fiber spinning technology for the precursor of the oxide.Long precursor filaments were prepared by dry spinning with a starting homogeneous aqueous poly vinyl alcohol solution containing Y or Nd, Ba and Cu acetates. The as-drawn filament with diameter of 250mum was pyrolyzed to remove the volatile components and heated to generate a superconducting phase. By controlling the spinning process and partially melted treatment in O_2 flow, maximum J_c value of more than 10^5A/cm^2 at 77K and 0T was attained for the filamentary Y123 superconductor.A Y123 superconducting filament of 60mum in diameter and 200mm in lenth with high J_c of more than 10^4A/cm^2 was obtained by controlling the heating process.The oxygen controlled melt growth of the Nd123 precursor filament was examined. The field dependence of the transport J_c of the filamentary Nd123 superconductor was better than that for the Y123 superconductor and more than 10^3A/cm^2 at 77K and 10T was achieved for the filamentary Nd123 superconductor partially melted in 1%O_2+Ar flow. The fabrication of multifilamentary Y123 superconducting composite was made by using the silver paste and a composite with high superconducting and mechanical propeties was prepared.

在77K高T_c超导磁体的实际应用中，需要高磁场下具有高J_c的超导导线。研究了用纺织纤维纺丝技术制备长丝超导氧化物作为氧化物前驱体。以含Y或Nd、Ba和Cu的均相聚乙烯醇水溶液为起始原料，采用干纺丝法制备了长前驱丝。将直径为250mum的拉伸长丝进行热解去除挥发性成分，加热生成超导相。通过控制纺丝工艺和在O_2流中进行部分熔融处理，在77K和0T条件下，Y123长丝超导体的J_c值达到了10^5A/cm^2以上。通过控制加热过程，获得了直径60mm、长度200mm的Y123超导灯丝，J_c大于10^4A/cm^2。研究了Nd123前驱体丝的氧控熔体生长。线状Nd123超导体的输运J_c的场依赖性优于Y123超导体，在1%O_2+Ar流中部分熔化的线状Nd123超导体在77K和10T时输运J_c的场依赖性大于10^3A/cm^2。利用银浆制备了多丝Y123超导复合材料，制备了具有高超导性能和力学性能的复合材料。

项目成果

T.Goto (H.Tomita): "Solution spinning of a high-Tc oxide superconductor : the effect of poly (vinyl alcohol) spinning medium on the critical current density of melt-processed Y1Ba2Cu3Ox superconducting filaments" Supercond.Sci.Technol.9. 1099-1104 (1996)

T.Goto (H.Tomita)：“高 Tc 氧化物超导体的溶液纺丝：聚乙烯醇纺丝介质对熔融加工 Y1Ba2Cu3Ox 超导丝临界电流密度的影响”Supercond.Sci.Technol.9

H.Tomita, T.Goto, K.Watanabe, S.Awaji and K.Takahashi: "The field dependence of J_C for the Y123 filament spun from various spinning dope" Czechoslovak J. Phys.46Suppl.S3. 1687-1688 (1996)

H.Tomita、T.Goto、K.Watanabe、S.Awaji 和 K.Takahashi：“由各种纺丝原液纺成的 Y123 长丝的 J_C 场依赖性”捷克斯洛伐克 J. Phys.46Suppl.S3。

T.Goto, M.Konishi and M.Tonomura: "Doping effect on partialmelting of Hg_xBa_2Ca_2Cu_3Re_<0.2>O_y filament" Advance.in Cryogenic Engineering. Vol.44(to be published).

T.Goto、M.Konishi 和 M.Tonomura：“掺杂对 Hg_xBa_2Ca_2Cu_3Re_<0.2>O_y 灯丝部分熔化的影响”Advance.in Cryogenic Engineering。

H.Tomita, T.Goto and K.Takahashi: "Solution spinning of a high T_C oxide superconductor : part VII. The effect of polyvinyl alcohol spinning medium on the sintering of YBa_2Cu_3O_x superconducting filaments" Supercond. Sci. Technol.9. 363-367 (1996)

H.Tomita、T.Goto 和 K.Takahashi：“高 T_C 氧化物超导体的溶液纺丝：第七部分。聚乙烯醇纺丝介质对 YBa_2Cu_3O_x 超导丝烧结的影响”

H.Tomita, T.Goto S.Shimada and K.Takahashi: "Solution spinning of a high-T_C oxide superconductor : 5. The influence of yttrium and barium ions on the poly (vinyl alcohol)-copper (II) complex" Polymer. 37. 1071-1077 (1996)

H.Tomita、T.Goto S.Shimada 和 K.Takahashi：“高 T_C 氧化物超导体的溶液纺丝：5. 钇和钡离子对聚（乙烯醇）-铜 (II) 复合物的影响”聚合物