Densification of bii 8(pb)o35sri9ca2icu3 0a And texture development through sinter-forging

Anna Tampieri, Roberto Masini, Lucangelo Dimesso, Stefano Guicciardi, M. Cristina Malpezzi

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A technique known as sinter-forging has been used to achieve dense Bi1.8(Pb)0.35Sr1.9Ca2.1Cu3Ox high-Tc superconducting material with oriented grains. The relationship between the final microstructure and processing conditions was elucidated. Material density and texture increases with the hot-forging pressure and temperature. Grains are elongated with the c-axis oriented approximately parallel to the direction of applied stress. The degree of grain orientation has been quantified using X-ray diffraction and is reported in terms of Lotgering's orientation factors. A maximum orientation factor of 38% was found for processing at 830°C and 4 MPa in air. The influence of the sintering temperature and atmosphere on the electrical properties has been investigated. After processing at 810°C and 4 MPa, the sinter-forged materials exhibit superconductivity, according to resistivity measurements, with a Tc (R=0) of 104 K. The critical current density at 77 K increases with increasing bulk density.

Original languageEnglish (US)
Pages (from-to)4490-4495
Number of pages6
JournalJapanese Journal of Applied Physics
Volume32
Issue number10 R
DOIs
StatePublished - Jan 1 1993

Keywords

  • Bi(Pb)SrCaCuO
  • High-7c superconductor
  • Hot-forging
  • Superconductor densification

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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