Manufacture of long lengths of HTSC wires by extrusion

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:43011

Yamashita, T; Bhargava, A; Golden, S; Zhao, R; Page, D; Barry, J; Mackinnon, I D.R. ^[1]

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1. Univ. of Queensland, St. Lucia (Australia). Centre for Microscopy and Microanalysis

Powders of YBa{sub 2}Cu{sub 3}O{sub 7} were prepared by co-precipitation using aqueous solution of nitrates and oxalic acid. Precipitated powders were then filtered and dried. The dried powders were calcined at 500C or 800C and mixed with 2wt% of hydroxypropylmethylcellulose and small amounts of water. Long lengths of superconducting YBa{sub 2}Cu{sub 3}O{sub 7} wires were fabricated by means of extrusion followed by sintering. The maximum critical current density, J{sub c}, 1,100 A/cm{sup 2} (in transport) was obtained for samples prepared from 500C calcined powder and sintered at 920C. To improve J{sub c}, Y211 phase was also introduced to the calcined powder mix and extruded with binder. The maximum J{sub c} obtained by these techniques was 200 A/cm{sup 2}. A long length of wire was also extruded from the mixture of calcined Y123 powder, HPMC and a small amount of water. J{sub c} measurements show sintered density and absence of macro-pores are critical to maintain J{sub c} values. In long lengths of wire for which this condition holds the reduction of J{sub c} value with wire distance is minimal.

• OSTI ID: 43011
• Report Number(s): CONF-9310224--; ISBN 0-87339-271-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
CHEMICAL PREPARATION
COPPER OXIDES
CRITICAL CURRENT
EXPERIMENTAL DATA
EXTRUSION
MICROSTRUCTURE
SUPERCONDUCTING WIRES
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES