YBaCuO thick films on planar and curved technical substrates

Freyhardt, H.C.; Hoffmann, J.; Wiesmann, J.; Dzick, J.; Heinemann, K.; Isaev, A. Yu.; García‐Moreno, Francisco; Sievers, S.; Usoskin, A.

doi:10.1109/77.620839

Cited by 50 publications

(17 citation statements)

References 11 publications

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“…Direct IBAD technology on cylinder substrates was already tested but with low level of performances due to low efficiency of the unidirectional ion beam on a curved surface [8][9] [10]. The new technology proposed here involves a substrate fully textured in flat shape (deposited or not) and the micro-tube manufacture technology developed at Nexans for medical needles (Fig.…”

Section: Round Wire Preparationmentioning

confidence: 99%

New HTS 2G Round Wires

Bruzek

Allais²,

Morice³

et al. 2012

IEEE Trans. Appl. Supercond.

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Section: Round Wire Preparationmentioning

confidence: 99%

New HTS 2G Round Wires

Bruzek

Allais²,

Morice³

et al. 2012

IEEE Trans. Appl. Supercond.

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“…Manuscript Typical method for making a textured buffer layer in the first approach is an ion beam assisted deposition (IBAD) [2], [3]. The second method is related to the rolling assisted biaxially textured substrate (RABiTS) [1].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of YBCO Superconducting Tape by Metal Organic Chemical Vapor Deposition Method

Jun

Choi

Kim

et al. 2005

IEEE Trans. Appl. Supercond.

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YBCO films for coated conductors (CC) were fabricated by a metal organic chemical vapor deposition (MOCVD) system of hot-wall type using a single source. The deposition condition was optimized using (100) SrTiO 3 single crystal substrates in a steady state, and then the substrate was replaced by moving IBAD template (CeO 2 /IBAD-YSZ/stainless steel) of 40 cm/hr. Two different types of IBAD templates with thin CeO 2 and thick CeO 2 layers were used. The mole ratio of MO source was Y(tmhd) 3 : Ba(tmhd) 2 : Cu(tmhd) 2 = 1 : 2 1 : 2 9, and the YBCO films were prepared at the deposition temperatures of 780 890 C. The a-axis growth was observed together with the c-axis growth up to 830 C, while the c-axis growth became dominant above 830 C. The top surface of the c-axis film was fairly dense and crack-free. In case of the YBCO film with a 2.2 m thickness deposited on the SrTiO 3 substrate at 860 C, the deposition rate was as high as 0.37 m min. The critical current and critical current density of the film was 104 A/cm-width and 0.47 MA cm 2 , respectively. The YBCO film deposited on the IBAD template with a thin CeO 2 layer showed a low critical current of 2.5 A/cm-width, while the YBCO film deposited on the IBAD template with a thick CeO 2 layer showed a higher critical current of 50 A/cm-width. It indicates that the stable buffer layer at high deposition temperature is needed for the MOCVD process.Index Terms-CeO 2 layer, critical current, IBAD template, MOCVD, SrTiO 3 substrate, YBCO film.

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“…The tolerance of these conductors to stress and strain needs to be known for optimized cable fabrication and magnet applications. Only limited data are available on electromechanical properties of the coated conductors so far [1,[4][5][6][7][8]. Besides axial tension, transverse compression acting on the tape may play a significant role in determining the ultimate performance of an electromagnet made of these conductors.…”

Section: Introductionmentioning

confidence: 99%

Transverse compressive stress, fatigue, and magnetic substrate effects on the critical current density of Y-Ba-Cu-O coated RABiTS tapes

Cheggour¹,

Ekin²,

Clickner³

et al. 2002

AIP Conference Proceedings

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The electromechanical properties of (0.3 |im thick) yttrium-barium-copper-oxide (YBCO) coatings on buffered pure-nickel rolling-assisted-biaxially-textured substrates (RABiTS) were measured at 76 K and self magnetic field. YBCO coatings on buffered substrates both 50 |nm and 125 [im thick were tested. Significant degradation of transport critical-current density (J c ) can occur from transverse compressive stress unless the inplane yielding of the substrate is prevented by providing frictional support to the sample or by using substrate materials of high yield-strength. Scanning electron microscopy was used to investigate the microstructure of the samples after electromechanical testing. Isolated defective regions were found with a mixed pattern of cracks, both longitudinal and transverse to the direction of electrical-current flow. The more the degradation of J c from electromechanical testing, the greater the density of the observed cracked regions. Also, it was found that the use of magnetic substrates in the fabrication of the YBCO coatedconductor tapes produces a significant reduction in J c when the tapes are arranged in a stack of two or more layers. This effect is reversible upon unstacking the tapes.

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YBaCuO thick films on planar and curved technical substrates

Cited by 50 publications

References 11 publications

New HTS 2G Round Wires

New HTS 2G Round Wires

Fabrication of YBCO Superconducting Tape by Metal Organic Chemical Vapor Deposition Method

Transverse compressive stress, fatigue, and magnetic substrate effects on the critical current density of Y-Ba-Cu-O coated RABiTS tapes

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