Mechanical properties of YBCO and YBCO+ZnO polycrystalline superconductors using Vickers hardness test at cryogenic temperatures

Kolemen U., Celebi S., Yoshino Y., Ozturk A.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, vol.406, no.1-2, pp.20-26, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 406 Issue: 1-2
  • Publication Date: 2004
  • Doi Number: 10.1016/j.physc.2004.02.174
  • Journal Name: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.20-26
  • Keywords: YBCO superconductors, Vickers hardness, cryogenics temperatures, elastic deformation and plastic deformation, SILICA AEROGELS, FLOW-STRESS, CERAMICS, METALS, DEPENDENCE, PLASTICITY, POROSITY
  • Yozgat Bozok University Affiliated: No

Abstract

Vickers hardness tests were carried out on YBCO and YBCO + 1 wt% ZnO polycrystalline superconductors from 40 to 293 K. It was found that the hardness was increased with 1 wt%ZnO addition to YBCO. Thermal activation energies of samples YBCO and YBCO + 1 wt%ZnO were found to be 0.0036 and 0.0026 eV, respectively. No creep was observed in the load-displacement experiments carried out for both samples at low temperatures, when the load was kept fixed for 15 s. It was detected that elastic recovery ratio of the 1 wt%ZnO added YBCO sample was higher than that of YBCO at both low temperature and room temperature. (C) 2004 Elsevier B.V. All rights reserved.