Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets

A. G. Mamalis, G. Pantazopoulos, A. Szalay, I. Kotsis, I. Vajda, D. E. Manolakos

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The fabrication of silver-sheathed Y(Ba,K)2Cu3O7 superconducting rods by explosive compaction and subsequent warm-plastic deformation, employing multiple-pass extrusion at 470°C, is reported and discussed. The impurity phase content, as well as the superconductivity of the component, were carefully controlled by employing intermediate and post-processing heat-treatment in flowing oxygen. The characterization of the extruded rod, after every extrusion pass, indicates a progressive microstructural refinement, leading to subsequent reduction of the porosity, closing of microcracks and enhancing the integrity of the metal/ceramic interface. Evaluation of the mechanical properties of the ceramic core-material, e.g. microhardness and fracture toughness, indicated significant improvement of the formability of the fabricated component. The various phase-transformations and transition temperature, Tc changes are presented and discussed, with respect to the manufacturing processes employed. Extruded rods, of 5 mm diameter and 50 mm length, are used as HTS conductors in a rotating electrical machine.

Original languageEnglish
Pages (from-to)213-229
Number of pages17
JournalApplied Superconductivity
Volume4
Issue number5-6
Publication statusPublished - May 1996

Fingerprint

billets
Extrusion
rods
Phase transitions
ceramics
Cermets
rotating electrical machines
Microcracks
Formability
Superconductivity
Metals
metals
Microhardness
Superconducting transition temperature
Fracture toughness
Plastic deformation
Silver
Compaction
Porosity
microcracks

ASJC Scopus subject areas

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

Cite this

Mamalis, A. G., Pantazopoulos, G., Szalay, A., Kotsis, I., Vajda, I., & Manolakos, D. E. (1996). Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets. Applied Superconductivity, 4(5-6), 213-229.

Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets. / Mamalis, A. G.; Pantazopoulos, G.; Szalay, A.; Kotsis, I.; Vajda, I.; Manolakos, D. E.

In: Applied Superconductivity, Vol. 4, No. 5-6, 05.1996, p. 213-229.

Research output: Contribution to journalArticle

Mamalis, AG, Pantazopoulos, G, Szalay, A, Kotsis, I, Vajda, I & Manolakos, DE 1996, 'Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets', Applied Superconductivity, vol. 4, no. 5-6, pp. 213-229.
Mamalis, A. G. ; Pantazopoulos, G. ; Szalay, A. ; Kotsis, I. ; Vajda, I. ; Manolakos, D. E. / Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets. In: Applied Superconductivity. 1996 ; Vol. 4, No. 5-6. pp. 213-229.
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