Binder effect on microstructure and properties of YBa2Cu3O7-x extruded wires

Yamashita, T., Alarco, J.A., Riches, J.D., Bhargava, A., Barry, J.C., & Mackinnon, I.D.R. (1998) Binder effect on microstructure and properties of YBa2Cu3O7-x extruded wires. Physica C : Superconductivity and its Applications, 298(3-4), pp. 159-165.

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YBa2Cu3O7-x wires have been extruded with 2 and 5 wt.% of hydroxy propyl methylcellulose (HPMC) as binder. Both sets of wires sintered below 930°C have equiaxed grains while the wires sintered above this temperature have elongated grains. In the temperature range which gives equiaxed grains, the wires extruded with 5 wt.% HPMC have higher grain size and density. Cracks along the grain boundaries are often observed in the wires having elongated grains. Critical current density, Jc, increases initially, reaches a peak and then decreases with the sintering temperature. The sintering temperature giving a peak in Jc strongly depends on the heat treatment scheme for the wires extruded with 5 wt.% HPMC. TEM studies show that defective layers are formed along grain boundaries for the wires extruded with 5 wt.% HPMC after 5 h oxygenation. After 55 h oxygenation, the defective layers become more localised and grain boundaries adopt an overall cleaner appearance. Densification with equiaxed grains and clean grain boundaries produces the highest Jc's for polycrystalline YBa2Cu3O7 wires.

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ID Code: 57457
Item Type: Journal Article
Refereed: Yes
Additional Information: Export Date: 19 February 2013
Source: Scopus
Language of Original Document: English
Correspondence Address: Yamashita, T.; Advanced Ceramics Development, UniQuest Ltd., University of Queensland, St. Lucia, QLD 4072, Australia
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Keywords: Long lengths of wires, YBa2Cu3O7-x, Cellulose, Critical current density, Densification, Grain boundaries, Grain size and shape, High temperature superconductors, Copper Oxide superconductors, Polycrystalline materials, Sintering, Yttrium compounds, Hydroxy propyl methylcellulose, Yttrium barium copper oxide, Superconducting wire
DOI: 10.1016/S0921-4534(97)01883-2
ISSN: 0921-4534
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 25 Feb 2013 23:43
Last Modified: 25 Feb 2013 23:43

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