DocumentCode :
1219273
Title :
Transport Characteristics of CVD-YBCO Coated Conductor under Hoop Stress
Author :
Nishijima, Gen ; Oguro, Hidetoshi ; Awaji, Satoshi ; Watanabe, Kazuo ; Shikimachi, Koji ; Hirano, Naoki ; Nagaya, Shigeo
Author_Institution :
High Field Lab. for Supercond. Mater., Tohoku Univ., Sendai
Volume :
18
Issue :
2
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
1131
Lastpage :
1134
Abstract :
Transport characteristics of IBAD/ CVD-YBa2Cu3O7 (YBCO) coated conductor were measured at 4.2 K under hoop stress. The conductor was fabricated by a multi-stage metal-organic chemical vapor deposition (CVD) method. The YBCO layer was deposited on Hastelloy substrate with PLD-Ce02 and IBAD-Gd2Zr207 buffer layers. A 20-mum silver layer was sputtered as a protective and stabilizing layer. The hoop stress test coils were fabricated by winding the conductor on a 250-mm diameter stainless-steel bobbin by five turns. Two coils, denoted as coils A and B, were fabricated. The Hastelloy substrate located outside for coil A and inside for coil B. Both coils were tested in magnetic field at 4.2 K under hoop stresses. Coil A and B experienced 1028 and 777 MPa at 11 T, 4.2 K. The measured stress-strain curves provided that the Young´s modulus of the conductor was 190 GPa. The tolerable stress of ~1000 MPa and the Young´s modulus of 190 GPa are consistent with the values obtained by a tensile test. The hoop stress test results indicates that the YBCO coated conductor is promising for application under huge hoop stress.
Keywords :
MOCVD; Young´s modulus; barium compounds; high-temperature superconductors; stress-strain relations; tensile strength; yttrium compounds; CVD; FeNiMoJk; Hastelloy substrate; YBa2Cu3O7; Young´s modulus; coated conductor; hoop stress; multistage metal-organic chemical vapor deposition method; protective layer; silver layer; stabilizing layer; stainless-steel bobbin; stress-strain curves; temperature 4.2 K; tensile test; transport characteristics; Coated conductor; YBCO; hoop stress; magnetic field; transport characteristics;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2008.921240
Filename :
4520249
Link To Document :
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