High-Temperature Ultrasonic Characterization of Ag-Clad Superconductor Tapes

M. T. Lanagan, D. S. Kupperman, G. A. Yaconi, S. H. Kilgore, A. Saigal

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


An ultrasonic nondestructive evaluation technique was developed to monitor liquid-phase evolution during heat treatment of high-Tc superconductors. The liquid phase is essential for microstructural and phase development of superconductors and is important in fabricating conductors with high critical current density, Jc. Tapes were fabricated by a powder-in-tube process and then placed in a 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 Al2O3and NaCl cores were used to validate the measurement technique. Advantages of this approach over other thermal analysis methods include in-situ analysis of the final tape form, monitoring of isothermal liquid evolution, and control of volatile species such as Tl and Pb.

Original languageEnglish (US)
Pages (from-to)1475-1478
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jun 1995

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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