Application of high temperature superconducting thick films to magnetic shielding and valuation of the film

高温超导厚膜在磁屏蔽中的应用及薄膜的评估

• 批准号: 03452187
• 负责人: MINEMOTO Takumi
• 金额: $ 2.88万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452187/
• 关键词: high temperature superconductor; thick film of high Tc superconductor; magnetic shielding; YBCO superconductor; Meissner effect; magnetic force microscope; 磁気シ-ルド; 磁気トラップ; マイスナ-効果

The following results have been obtained in this research.(1) By the addition of a suitable amount of silver (7 wt %), the zero-resistance temperature of Y-Ba-Cu-O (YBCO) increased by 3 K and its critical current density became 9 times larger than that of YBCO without Ag.(2) A magnetic force sensing system using a highly sensitive force sensor has been developed to measure two dimensional distribution of the Meissner effect. Using this system, it was founded that uniformity of superconductivity in a superconductor is affected strongly by the distribution of its components.(3) The maximum shielded magnetic flux densities of cylinders made with bulk YBCO were about several tens Gauss. But the maximum shielded flux density was increased successfully to 400 G by imposing a cylinder made with some chiep ferro-magnetic material over the YBCO cylinder.(4) We succeeded in oxidizing a Cu cylinder surface in a state of thin film and molding a superconducting YBCO thick film on the cylinder surface.(5) The maximum shielded magnetic flux density of a thick film YBCO cylinder made as a trial was 30 mG because the YBCO film was porous. The magnetic shielding effect of thick YBCO films will be improved by making the film with higher YBCO density.

（1）通过添加适当量的银（7 wt％），Y-BA-CU-O（YBCO）的零电阻温度增加了3 k，其零耐力得以增加3 k，其零耐力得以升高，其ITS的零耐耐温度升高，其零耐高温升高，IT临界电流密度比没有AG的YBCO大9倍。（2）已经开发了使用高敏感力传感器的磁力传感系统来测量Meissner效应的二维分布。使用该系统，建立了超导体中超导性的均匀性受其组件的分布的强烈影响。（3）用块状YBCO制成的最大屏蔽磁通量密度的最大屏蔽磁通量密度大约是几个Tens Gauss。但是，通过在YBCO圆柱体上施加了用某些Chiep铁磁材料制成的圆柱体，成功提高了最大屏蔽的通量密度。 （5）厚膜YBCO圆柱体的最大屏蔽磁通量密度为试验的最大屏蔽磁通量密度为30毫克，因为YBCO膜是多孔的。厚YBCO膜的磁屏蔽效果将通过使薄膜具有较高的YBCO密度来提高。

项目成果

M.Itoh,T.Ohyama,T.Minemoto,K.Numata,K.Hoshino: "The improvement in magnetic shielding by use of a double cylinder configuration of high Tc oxide superconductors" Physics D. 25. 1630-1634 (1992)

M.Itoh、T.Ohyama、T.Minemoto、K.Numata、K.Hoshino：“通过使用高 Tc 氧化物超导体的双圆柱配置来改善磁屏蔽” 物理 D. 25. 1630-1634 (1992)

H.Ishigaki,M.Itoh,A.Hida,K.Iwata: "New measuring system for the distribution of a magnetic force by using an optical fiber" Rev.Sci.Instrum.64. (1993)

H.Ishigaki、M.Itoh、A.Hida、K.Iwata：“使用光纤测量磁力分布的新系统”Rev.Sci.Instrum.64。

T.Ohyama,M.Ishidoh,M.Itoh: "Fundamental characteristics of differential transfomer type displacement sensor using a YBCO superconductor" IEEE Trans.J.Manetics in Japan. 7. 539-544 (1992)

T.Ohyama、M.Ishidoh、M.Itoh：“使用 YBCO 超导体的差动变压器型位移传感器的基本特性”日本 IEEE Trans.J.Manetics。

H.Ishigaki,M.Itoh,A.Hida,H.Endo,T.Ohyama,T.Minemoto: "Measurement of repulsive force of high Tc materials due to Meissner effect and its two dimensional distribution" IEEE Trans.Magnetics. 28. 2427-2430 (1991)

H.Ishigaki、M.Itoh、A.Hida、H.Endo、T.Ohyama、T.Minemoto：“由于迈斯纳效应及其二维分布而测量高 Tc 材料的排斥力”IEEE Trans.Magnetics。

H.Ishigaki, H.Ito, M.Itoh, A.Hida and R.Takahata: "Magnetic coupling by use of levitation characteristics of YBCO superconductors" IEEE Trans. Appl. Super-coductivity. 2. (1993)

H.Ishigaki、H.Ito、M.Itoh、A.Hida 和 R.Takahata：“利用 YBCO 超导体的悬浮特性进行磁耦合”IEEE Trans。