Effect of lead content on phase evolution and microstructural development in Ag-clad Bi-2223 composite conductors

被引：0

作者：

Merchant, NN ^{[1
]}

Maroni, VA ^{[1
]}

Fischer, AK ^{[1
]}

Dorris, SE ^{[1
]}

Zhong, W ^{[1
]}

Ashcom, N ^{[1
]}

机构：

[1] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

HIGH-TEMPERATURE SUPERCONDUCTORS: SYNTHESIS, PROCESSING, AND APPLICATIONS II | 1996年

关键词：

D O I：

暂无

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A two powder process was used to prepare silver-sheathed monofilamentary Bi1.8PbxSr1.98Ca1.97Cu3.08Oy (Bi-2223) tapes with varying lead contents, x, from 0.2 to 0.5. The resulting tapes were subjected to thermomechanical processing and then characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive x-ray analysis (EDX). Layered phase texture was accessed using image analysis software on scanned SEM micrographs. Transport currents were measured at 77 K and zero field by the four-probe method. It was found that tapes with low lead content (x=0.2 and 0.25) showed incomplete conversion to Bi-2223, had small grain size and poor c-axis texture. Tapes having higher lead content (x=0.4 and 0.5) also showed incomplete conversion and the presence of lead-rich secondary phases. Tapes with lead content x=0.3 and 0.35 showed complete conversion to Bi-2223, and had the least amount of secondary phases, the best c-axis texture, and the highest transport currents (J(c)). The carbon content of the precursor powder also had a strong influence on secondary-phase chemistry.

引用

页码：25 / 34

页数：10