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.
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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|Item Type:||Journal Article|
|Additional Information:||Export Date: 19 February 2013
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|
|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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