ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We fabricated Bi-2212/SrSO4 composite superconductors by the melt casting process andevaluated the effects of the powder mixing method and melting temperature on their microstructureand superconducting properties. In the melt casting process, the Bi-2212 powders were mixed withSrSO4 by hand-mixing (HM) and planetary ball milling (PBM) and then the powder mixtures weremelted at 1100℃~1200℃, solidified, and annealed.We found that the powder mixture prepared by PBM was finer and more homogeneously mixedthan that prepared by HM, resulting in more homogeneous microstructure and smaller SrSO4 andsecond phases after annealing. The critical current (Ic) also varied significantly with the powdermixing method and the melting temperature. The Ic of the annealed rod prepared by PBM was 193A at 77 K when melted at 1100℃, which is higher than that of the annealed rod prepared by HM(132 A). This enhancement in the Ic value for the former is considered to be due to its more uniformmicrostructure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1597.pdf
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