HIGH-TEMPERATURE ULTRASONIC CHARACTERIZATION OF AG-CLAD SUPERCONDUCTOR TAPES

被引：10

作者：

LANAGAN, MT ^{[1
]}

KUPPERMAN, DS ^{[1
]}

YACONI, GA ^{[1
]}

KILGORE, SH ^{[1
]}

SAIGAL, A ^{[1
]}

机构：

[1] TUFTS UNIV,MEDFORD,MA 02155

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.402845

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An ultrasonic nondestructive evaluation technique was developed to monitor liquid-phase evolution during heat treatment of high-T-c superconductors. The liquid phase is essential for microstructural and phase development of superconductors and is important in fabricating conductors with high critical current density, J(c). Tapes were fabricated by a powder-in-tube process and then placed in controlled-atmosphere furnace, During heat treatment, a magnetostrictive transducer launches a 140-kHz wave into the sample, and the relative change in acoustic velocity is then measured. A significant decrease in velocity was seen at the incongruent melting temperatures of Bi-based superconductors. In addition, Ag-clad tapes with Al2O3 and NaCl cores were used to validate the measurement technique. Advantages of this approach over other thermal analysis methods include In-situ analysis of final tape form, monitoring of isothermal liquid evolution, and control of volatile species such as Tl and Pb.

引用

页码：1475 / 1478

页数：4

共 15 条

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