CUED Publications database

Improving Mechanical Strength of YBCO Bulk Superconductors by Addition of Ag

Congreve, JVJ and Shi, Y and Huang, KY and Dennis, AR and Durrell, JH and Cardwell, DA (2019) Improving Mechanical Strength of YBCO Bulk Superconductors by Addition of Ag. In: Applied Superconductivity Conference (ASC), 2018-10-28 to 2018-11-2 pp. 1-5..

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Abstract

The widespread use of ceramic (RE)Ba2Cu3O7 bulk superconductors (RE-123), where RE = Y, Gd, or Sm, is generally hindered by their poor mechanical properties. While a large number of techniques can be used to improve the mechanical properties of conventional ceramic materials, many of these are incompatible with the growth of single grain, bulk RE-123 superconductors using the top seeded melt growth (TSMG) process. Complications arise due to the need to minimize the degradation of the superconducting properties and produce a single-grained sample. Nonetheless, the addition of Ag to RE-Ba-Cu-O [(RE)BCO] precursor powder has been demonstrated to be effective in improving the mechanical properties of single grain bulk superconductors fabricated by TSMG without deleterious effects on performance. Although large single grains of GdBa2Cu3O7-Ag and SmBa2Cu3O7-Ag have been successfully and reliably grown, it has proven more difficult to grow large single grains of YBa2Cu3O7-Ag. We recently demonstrated the growth of single grain YBa2Cu3O7-Ag bulk superconductors that exhibit relatively good superconducting properties. In this work, we report the flexural stress at a number of locations within YBa2Cu3O7 single grains grown by TSMG with and without additional liquid phase and with silver addition. In addition, we have compared the distribution of the failure stress with the pore and silver distribution.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Div C > Engineering Design
Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 28 Apr 2019 20:03
Last Modified: 09 Sep 2021 02:24
DOI: 10.1109/TASC.2019.2907474