Effects of precursor powder calcination on critical current density and microstructure of Bi-2223/Ag tapes

被引：31

作者：

Jiang, J

Abell, JS

机构：

[1] School of Metallurgy and Materials, University of Birmingham

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1997年 / 10卷 / 09期

关键词：

D O I：

10.1088/0953-2048/10/9/008

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of precursor powder calcination conditions on the phase formation, microstructure evolution and critical current density of the Bi-2223/Ag tapes have been studied, The precursor powders and tapes were characterized by XRD and SEM with EDX analysis. It has been found that both the microstructure and critical current density depend strongly on the powder calcination condition. Different calcination conditions resulted in different phase assemblages in the precursors, which determined the reactivity of the precursor and the final properties of the Bi-2223 tape. Increasing the calcination temperature, extending the calcination tine and applying intermediate grinding resulted in the decrease in the relative amounts of Ca2PbO4 and CuO, and the increase of Ca2CuO3 in the precursor powder. The presence of Ca2PbO4 aids liquid phase formation, enhancing diffusion and healing of microcracks.

引用

收藏

页码：678 / 685

页数：8

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