Basic Research on Electro-Magnetic Failure and Quench of High Tc oxide Superconductor by Means of SQUID

SQUID高Tc氧化物超导体电磁破坏及淬火基础研究

• 批准号: 01420020
• 负责人: SHOJI Tetsuo
• 金额: $ 14.21万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420020/
• 关键词: SQUID; Micro Crack; Oxide Superconductor; Bragilian Test; Transition; Micro Fracture Mechanism; Kaiser Effect; Micro Magnetic Field Measurement; 超伝導酸化物; 磁場変動; クエンチ; 破壊予知; 超伝導; 電磁破壊; YBCO; 破壊特性

In order to establish a reliable use of high Tc uxide superconductor such as YBCO, mechanistic understanding of brittle failure of these ceramics superconductors have to be achieved to apply these materials for engineering parts and / or component which can be subjected a large current causing large electromagnetic force. In micro crack initiation and propagation can be failure processes as well as other ceramics materials. In this research, SQUID (Superconducting Quantum Interference Device) has been successfully applied to detect micro crack for formation and growth of YBCO under leading condition. Magnetic field analysis was also performed for determination of location of micro cracking and result in identify the cracking site of specimens. Results can be summarized as follows,1) Micro crack initiation and stable crack growth were observed in YBCO under mechanical loading and confirmed by use of Kaiser effect.2) These stable micro crack formation was detected nondestructively by means of SQUID.3) Quench phenomenon can be detected at a very early stage by SQUID.

为了建立诸如YBCO的高Tc氧化物超导体的可靠使用，必须实现对这些陶瓷超导体的脆性破坏的机理理解，以将这些材料应用于可以经受大电流引起大电磁力的工程部件和/或组件。在微观裂纹的萌生和扩展过程中，可以像其他陶瓷材料一样破坏。本研究利用超导量子干涉仪（SQUID）成功地探测了超导体YBCO在高温超导条件下微裂纹的形成和生长。通过磁场分析确定了微裂纹的位置，从而确定了试样的裂纹位置。结果表明：1）在机械载荷作用下，YBCO中出现了微裂纹萌生和稳定扩展现象，并通过Kaiser效应得到了证实; 2）利用SQUID无损检测了这些稳定的微裂纹的形成; 3）SQUID可以在很早的阶段检测到淬火现象。

项目成果

Y. Shindo, T. Shoji, M. Nakajima, H. Nakajima, M. Sugimoto, K. Yoshida, H. Tuji: "Mechanical Behavior and Coil Rigidity of S/C Magnet" J. Cryogenic Engineering. 27. 57-62 (1992)

Y. Shindo、T. Shoji、M. Nakajima、H. Nakajima、M. Sugimoto、K. Yoshida、H. Tuji：“S/C 磁体的机械行为和线圈刚性”J. 低温工程。

庄子 哲雄,坂根 正道,近藤 武志: "超伝導マグネット初期不整合の非破壊検出と剛性評価" 低温工学. 26. 472-479 (1991)

Tetsuo Shoko、Masamichi Sakane、Takeshi Kondo：“超导磁体初始失准的无损检测和刚度评估”《低温工程》26. 472-479 (1991)。

庄子 哲雄,進藤 裕英,中島 美樹子,坂根 正道,笠場 孝一,中嶋 秀夫,杉本 誠,吉田 清,辻 博史: "超伝道マグネットの剛性評価評価法 実験的検証" 低温工学. 26. 467-471 (1991)

Tetsuo Shoko、Hirohide Shindo、Mikiko Nakajima、Masamichi Sakane、Koichi Kasaba、Hideo Nakajima、Makoto Sugimoto、Kiyoshi Yoshida、Hiroshi Tsuji：“超导磁体刚度评估方法的实验验证”《低温工程》26. 467-471（1991）。

進藤 祐英,庄子 哲雄,中島 美樹子,中嶋 秀夫,杉本 誠,吉田 清,辻 博史: "超伝導マグネットの力学的挙動とコイル剛性" 低温工学. 27. 57-62 (1992)

Yuhide Shindo、Tetsuo Shoko、Mikiko Nakajima、Hideo Nakajima、Makoto Sugimoto、Kiyoshi Yoshida、Hiroshi Tsuji：“超导磁体的机械行为和线圈刚度”《低温工程》27. 57-62 (1992)。

T.Shoji and Y.Tazawa: "Deformation and Fracture Characteristics and its Effects on Superconductivity of High Tc Ceramic Superconductor" Proc.of JapanーUS Seminar. (1991)

T.Shoji 和 Y.Tazawa：“高温陶瓷超导体的变形和断裂特性及其对超导性的影响”日美研讨会论文集。