Melt-textured YBa2Cu3O7-x wires having plate-like grains


Autoria(s): Yamashita, T.; Bhargava, A.; Golden, S.J.; Barry, J.C.; Page, D.; Mackinnon, I.D.R.
Data(s)

01/02/1997

Resumo

YBCO wires which consist of well oriented plate-like fine grains are fabricated using a moving furnace to achieve higher mechanical strength. Melt-texturing experiments have been undertaken on YBCO wires with two different compositions: YBa1.5Cu2.9O7-x, and YBa1.8Cu3.0O7-x. Wires are extruded from a mixture of precursor powders (formed by a coprecipitation process) then textured by firing in a moving furnace. Size of secondary phases such as barium cuprate and copper oxide, and overall composition of the sample affect the orientation of the fine grains. At zero magnetic field, the YBa1.5Cu2.9O7-x wire shows the highest critical current density of 1,450 Acm-2 and 8,770 Acm-2 at 77K and 4.2K, respectively. At 1 T, critical current densities of 30 Acm-2 and 200 Acm-2, respectively, are obtained at 77K and 4.2K. Magnetisation curves are also obtained for one sample to evaluate critical current density using the Bean model. Analysis of the microstructure indicates that the starting composition of the green body significantly affects the achievement of grain alignment via melt-texturing processes.

Identificador

http://eprints.qut.edu.au/57460/

Publicador

Elsevier

Relação

DOI:10.1016/S0167-577X(96)00201-7

Yamashita, T., Bhargava, A., Golden, S.J., Barry, J.C., Page, D., & Mackinnon, I.D.R. (1997) Melt-textured YBa2Cu3O7-x wires having plate-like grains. Materials Letters, 30(2-3), pp. 223-229.

Fonte

School of Chemistry, Physics & Mechanical Engineering; Institute for Future Environments; Science & Engineering Faculty

Palavras-Chave #091201 Ceramics #091205 Functional Materials #Critical current density #Melt-texturing #Moving furnace #YBCO #high temperature superconductor #Melt texturing #Well oriented plate like fine grains #Composition effects #Crystal microstructure #Fabrication #Magnetization #Oxide superconductors #Strength of materials #Yttrium compounds #Superconducting wire
Tipo

Journal Article