TY - JOUR
T1 - Buffer-assisted top-seeded infiltration and growth for fabricating dense, single-grain (RE)-Ba-Cu-O bulk superconductors
AU - Namburi, Devendra
AU - Shi, Yunhua
AU - Ainslie, Mark
AU - Dennis, Anthony
AU - Durrell, John
AU - Cardwell, David
N1 - Publisher Copyright:
© 2020 The Institute of Electrical Engineers of Japan.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - (RE)BCO, rare-earth based high temperature superconductors fabricated in the form of large, single grain bulk samples can trap comparatively large magnetic fields in relatively small sample volumes, unlike conventional permanent magnetic materials. Fabrication of (RE)BCO single grains has been achieved largely following the development of processing techniques based on melt growth (MG). In the present study, the recently developed alternative fabrication technique of infiltration and growth (IG) is discussed and its significance highlighted in the context of obtaining (RE)BCO bulk superconductors with dense microstructures. The necessity of employing a buffer layer in the IG methodology is elucidated. The path followed in solving the complex problem of controlling the amount of RE2BaCuO5 (RE-211) present in the microstructure of the end product to achieve enhanced and optimized flux pinning is described. A brief overview of the recently developed 2-step, buffer-assisted top-seeded infiltration and growth (BA-TSIG) fabrication technique, which enables successful fabrication of (RE)BCO bulks, is presented. Finally, two novel experiments based on the TSIG technique.fabrication of a bar-shaped YBCO sample (with size: 72mm × 24mm × 15 mm) and multiseeding of YBCO (with two NdBCO seeds in 0°-0° configuration, with aligned a-b planes)-are described and further potential options for the fabrication of complex-shaped (RE)BCO bulk components for specific practical applications are outlined.
AB - (RE)BCO, rare-earth based high temperature superconductors fabricated in the form of large, single grain bulk samples can trap comparatively large magnetic fields in relatively small sample volumes, unlike conventional permanent magnetic materials. Fabrication of (RE)BCO single grains has been achieved largely following the development of processing techniques based on melt growth (MG). In the present study, the recently developed alternative fabrication technique of infiltration and growth (IG) is discussed and its significance highlighted in the context of obtaining (RE)BCO bulk superconductors with dense microstructures. The necessity of employing a buffer layer in the IG methodology is elucidated. The path followed in solving the complex problem of controlling the amount of RE2BaCuO5 (RE-211) present in the microstructure of the end product to achieve enhanced and optimized flux pinning is described. A brief overview of the recently developed 2-step, buffer-assisted top-seeded infiltration and growth (BA-TSIG) fabrication technique, which enables successful fabrication of (RE)BCO bulks, is presented. Finally, two novel experiments based on the TSIG technique.fabrication of a bar-shaped YBCO sample (with size: 72mm × 24mm × 15 mm) and multiseeding of YBCO (with two NdBCO seeds in 0°-0° configuration, with aligned a-b planes)-are described and further potential options for the fabrication of complex-shaped (RE)BCO bulk components for specific practical applications are outlined.
KW - (RE)BCO bulk superconductors
KW - Buffer technique
KW - Dense microstructure
KW - Infiltration growth
KW - Melt growth
KW - Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=85081789881&partnerID=8YFLogxK
U2 - 10.1541/ieejpes.140.148
DO - 10.1541/ieejpes.140.148
M3 - Article
AN - SCOPUS:85081789881
SN - 0385-4213
VL - 140
SP - 148
EP - 153
JO - IEEJ Transactions on Power and Energy
JF - IEEJ Transactions on Power and Energy
IS - 3
ER -