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

Mamalis, AG; Pantazopoulos, G; Szalay, A; Kotsis, I; Vajda, I; Manolakos, DE

dc.contributor.author	Mamalis, AG	en
dc.contributor.author	Pantazopoulos, G	en
dc.contributor.author	Szalay, A	en
dc.contributor.author	Kotsis, I	en
dc.contributor.author	Vajda, I	en
dc.contributor.author	Manolakos, DE	en
dc.date.accessioned	2014-03-01T01:12:06Z
dc.date.available	2014-03-01T01:12:06Z
dc.date.issued	1996	en
dc.identifier.issn	0964-1807	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11953
dc.subject	Electrical Machine	en
dc.subject	Fracture Toughness	en
dc.subject	Interface Evaluation	en
dc.subject	Mechanical Property	en
dc.subject	Microstructures	en
dc.subject	Phase Transformation	en
dc.subject	Plastic Deformation	en
dc.subject	Heat Treatment	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	COMPOSITES	en
dc.subject.other	FABRICATION	en
dc.subject.other	POWDER	en
dc.title	Multiple-pass warm extrusion of explosively compacted ceramic superconductive (Y-Ba-K-Cu-O)/metal billets	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0964-1807(97)00005-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0964-1807(97)00005-7	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The fabrication of silver-sheathed Y(Ba,K)(2)Cu3O7 superconducting rods by explosive compaction and subsequent warm-plastic deformation, employing multiple-pass extrusion at 470 degrees 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-transformation and transition temperature, T-c 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. (C) 1997 Elsevier Science Ltd.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	APPLIED SUPERCONDUCTIVITY	en
dc.identifier.doi	10.1016/S0964-1807(97)00005-7	en
dc.identifier.isi	ISI:A1996XP02900002	en
dc.identifier.volume	4	en
dc.identifier.issue	5-6	en
dc.identifier.spage	213	en
dc.identifier.epage	229	en