Dissolution and resolidification of SmBa/sub 2/Cu/sub 3/O/sub 7-y/ seed during top seeded melt texturing of YBa/sub 2/Cu/sub 3/O/sub 7-y/

1999 ◽  
Vol 9 (2) ◽  
pp. 2097-2100 ◽  
Author(s):  
Y.A. Jee ◽  
Gye-Won Hong ◽  
Chan-Joong Kim ◽  
Tae-Hyun Sung
Keyword(s):  
Melt Texturing

Substrate Influence in YBaCuO Melt-Texturing Growth

1992 ◽  
Vol 275 ◽  
Author(s):  
N. Pellerin ◽  
M. Gervais ◽  
P. Odier
Keyword(s):  
Chemical Activity ◽  
High Chemical ◽  
Melt Texturing ◽  
Substrate Influence ◽  
High Chemical Activity

Melt-texturing of YBaCuO is generally processed on substrates. Due to its high chemical activity, the non-stoichiometric liquid, mainly due to the barium element, generally reacts with the substrate which is therefore subjected to play a role in the crystallization of YBaCuO and in the development of the texture. The particular case of Y2O3, which is a reacting but non-polluting substrate, is treated in details. The comparison of textured YBaCuO in similar conditions but on different substrates: Al2O3, Y2O3 and MgO gives some insight in the texturing process.

Melt Texturing of YBCO with Excess of Yttrium Oxide

1996 ◽  
pp. 663-666 ◽  
Author(s):  
Peter Görnert ◽  
Pavel Diko ◽  
Wolfgang Gawalek ◽  
Tobias Habisreuther ◽  
Anke Köhler ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Melt Texturing

Improvement on the melt-texturing performance of a (Y,Ta)0.5BaO3–YBa2Cu3Oy composite with superconductor applications

2015 ◽  
Vol 41 (1) ◽  
pp. 843-848
Author(s):  
Ausdinir D. Bortolozo ◽  
Wislei R. Osório ◽  
Célio J.V. Oliveira ◽  
Carlos Alberto M. dos Santos ◽  
Francisco Moura Filho ◽  
...  
Keyword(s):  
Melt Texturing

Magnetic melt texturing combined with hot pressing applied to superconducting (2223) Bi-Pb-Sr-Ca-Cu-O ceramics

1995 ◽  
Vol 8 (7) ◽  
pp. 558-563 ◽  
Author(s):  
J G Noudem ◽  
J Beille ◽  
E Beaugnon ◽  
D Bourgault ◽  
D Chateigner ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Melt Texturing

Phase diagram investigations for lowering the temperature of melt texturing of YBCO

1994 ◽  
Vol 235-240 ◽  
pp. 299-300 ◽  
Author(s):  
G. Krabbes ◽  
P. Schätzle ◽  
U. Wiesner ◽  
W. Bieger
Keyword(s):  
Phase Diagram ◽  
Melt Texturing

Processing of superconductive YBCO single-grain monoliths by Top-seeding-melt-texturing

1997 ◽  
Vol 282-287 ◽  
pp. 501-502 ◽  
Author(s):  
J. Wang ◽  
I. Monot ◽  
S. Marinel ◽  
M.P. Delamare ◽  
J. Provost ◽  
...  
Keyword(s):  
Single Grain ◽  
Melt Texturing

Melt texturing and properties control of Nd1+yBa2-yCu3Ox bulk materials

1996 ◽  
Vol 105 (5-6) ◽  
pp. 1445-1450 ◽  
Author(s):  
W. Bieger ◽  
U. Wiesner ◽  
G. Krabbes ◽  
P. Sch�tzle ◽  
A. Bauer ◽  
...  
Keyword(s):  
Bulk Materials ◽  
Melt Texturing

Microstructural improvements in melt-textured YBa2Cu3O7 bulk superconductors

1991 ◽  
Vol 49 ◽  
pp. 1076-1077
Author(s):  
R.L. Sabatini ◽  
Yimei Zhu ◽  
Y.L. Wang ◽  
Masaki Suenaga
Keyword(s):  
Electrical Properties ◽  
Weak Coupling ◽  
Processing Conditions ◽  
High Current ◽  
Shape Distortion ◽  
Commercial Viability ◽  
Bulk Superconductors ◽  
Current Path ◽  
Melt Texture ◽  
Melt Texturing

In spite of its known high intragranular current density Jc, bulk YBa2Cu3O7(123) superconductors presently have a limited commercial viability due to their low current carrying capacities. Thus the problem with the bulk superconductors is widely attributed to its weak coupling at the grain boundaries. One possible solution, based on work by Jin and others, is to “melt texture” the sample so that grains align to provide a high current path through the material. But melt texturing produces other problems such as microcracking and shape distortion.To investigate the problems associated with producing high Jc bulk superconductors from the melt texturing process, we have studied the effects of modifying composition and processing conditions of the samples and examined the resulting microstructure and electrical properties.

Distinguishing between YBa2Cu3O7-x and Y2BaCuO5 in melt-processed YBa2Cu3O7-x

1996 ◽  
Vol 54 ◽  
pp. 726-727
Author(s):  
J.D. Riches ◽  
J.C. Barry ◽  
P.J. McGinn
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Inclusion Size ◽  
Bulk Sample ◽  
Transmission Electron ◽  
Superconducting Ceramics ◽  
Maximum Improvement ◽  
Melt Texturing ◽  
Scanning Electron

Much of the work in high temperature superconducting ceramics in the last few years has been aimed at improving the critical current density (Jc). By melt-texturing samples it is possible to achieve a significant increase in the Jc of bulk YBa2Cu3O7-x (Y123). It has been known for some time that additions of Y2Ba2CuO5 (Y211) in the Y123 superconductor can improve the Jc. However, for the maximum improvement the Y211 particles must be very fine and well distributed throughout the sample. Thus it is clearly of considerable interest to be able to examine a bulk sample and be able to easily distinguish between the Y123 and Y211 particles. By a combination of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) it is possible to study grain size, inclusion size and dislocation structure in the same sample.

Dynamic Characterization in Advanced Manufacturing

1994 ◽  
Vol 38 ◽  
pp. 1-8
Author(s):  
Robert L. Snyder ◽  
Bin-Jiang Chen
Keyword(s):  
Carrying Capacity ◽  
Scale Up ◽  
Advanced Materials ◽  
Advanced Manufacturing ◽  
Ceramic Superconductor ◽  
Dynamic Characterization ◽  
Rapid Transition ◽  
Melt Texturing ◽  
Fast Dynamic ◽  
Temperature Dynamic

Abstract The coming era of reduced defense funding will dramatically alter the way in which advanced materials develop. In the absence of large funding researchers must concentrate on reducing the time that the R&D of a new materia) consumes. One way in which speed may be achieved is via the development of very fast dynamic characterization procedures which can rapidly and intelligently monitor and optimize the formation of a desired microstructure. Another potential advantage to this approach is its ability to characterize the actual amount of material which goes into a final product; permitting a rapid transition from R&D to manufacturing by avoiding the problems associated with scale-up. Example high-temperature dynamic characterization procedures have been applied to the problem of trying to improve the current carrying capacity of the YBa 2 Cu 3 O 7-8 ceramic superconductor by melt-texturing. These procedures have led to a technique for the preparation of specimens with J c on the order of 10,000 A/cm2.

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