期刊
MATERIALS RESEARCH BULLETIN
卷 78, 期 -, 页码 64-71出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2016.02.014
关键词
Amorphous materials; Thin films; Superconductors; Sol-gel chemistry; Surface properties
资金
- SuperOx Company (Russia)
- Skolkovo Foundation [Gamma39/14]
- RFBR [14-03-00950, 14-03-31885]
Chemical solution deposition of smooth amorphous Al2O3 thin films has been successfully used for planarization of long-length metallic substrates for 2G HTS superconducting wires production. A series of metal-organic precursors based on Al((PrO)-Pr-i)(3), Al(acac)(3), acetic acid, monoethanolamine (MEA) and diethylenetriamine (DETA) was developed. Correlations between the precursor composition and the features of its two-step thermal-induced transformation to amorphous Al2O3 were studied by H-1 NMR, IR spectroscopy and thermal analysis. Utilizing the solutions of {Al((PrO)-Pr-i)(3) + 2.5MEA + 6HAcet} in (PrOH)-Pr-i and {Al(acac)(3) + nDETA} in HAcet (n = 1-3) as precursors for dip-coating, we obtained the long-length Hastelloy C276 substrate covered by uniform amorphous 50-550 nm thick alumina films with surface roughness of about 0.5-1.5 nm. A 20 m long sample of 2G HTS wire with a commercial level of superconducting critical current of up to 300A was prepared based on Hastelloy substrate tape planarized with Al2O3. (C) 2016 Elsevier Ltd. All rights reserved.
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