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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Microstructure and stopped growth mechanism of Y123 bulk fabricated by directional infiltration and growth
DONG Hao(董 昊)1, HU Rui(胡 锐)1, LI Jin-shan(李金山)1, KOU Hong-chao(寇宏超)1,
XUE Xiang-yi(薛祥义)1, CHANG Hui(常 辉)1, CAO Hai-tao(曹海涛)1, ZHOU Lian(周 廉)1, 2

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,Xi’an 710072, China;
2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Abstract:The infiltration-growth process was used as an alternative to conventional melt processing techniques for the preparation of bulk YBa2Cu3O7−x(Y123) with finely dispersed small size Y2BaCuO5(Y211) particles. Bulk YBCO superconductors with uniformly distributed particles of micron-sized Y211 were prepared by the directional infiltration and growth(DIG). The microstructure changes of the Y211 particles at various stages of processing were studied. About 70% of Y211 particles are under 1 μm in the final sample. The different stopped growth mechanism of this material along the c axis and ab plane was discussed. Undercooling and viscosity lead to tanglesome thick boundary layer. So the Y123 growth along c axis is stopped. Yttrium lack in front of the ab plane is the main reason why the growth stops at this direction.

 

Key words: infiltration; superconductor; Y211; YBCO

ISSN 1672-7029
CN 43-1423/U

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