喷雾热解与共沉淀法制备高性能线材用Bi-2212粉末的中间相演变对比研究

Comparison of Intermediate Phase Evolution in Bi-2212 Powders Prepared by Spray Pyrolysis and Co-precipitation Methods for High Performance Wires

摘要:

采用喷雾热解和共沉淀工艺分别制备了Bi₂Sr₂CaCu₂O_8+δ (Bi-2212)前驱粉末，研究了Bi-2212前驱粉的中间相演化过程。与共沉淀工艺相比较，喷雾热解工艺提高了前驱粉末中Bi-2212晶粒的相转变效率；而且喷雾热解后粉末中残留的硝酸盐对Bi-2212晶粒的生长影响较小，共沉淀后粉末中残留碳酸盐会阻碍Bi-2212晶粒的形成。采用喷雾热解法制备的Bi-2212线材的性能与采用传统共沉淀工艺法制备的线材性能相近，但喷雾热解工艺的制备效率更高。因此，采用喷雾热解制备前驱粉末有助于实现Bi-2212线材的大规模生产。

Abstract:

Bi₂Sr₂CaCu₂O_8+δ (Bi-2212) precursor powders were prepared by spray pyrolysis (SP) and co-precipitation (CP) processes separately. The intermediate phase evolution of Bi-2212 grains was investigated. Compared with that prepared by CP process, the phase formation rate of Bi-2212 grains prepared by SP process is obviously improved. Furthermore, the residual carbonates in CP powders hinder the formation of Bi-2212 grains, while the nitrates in SP powders only have a weak influence on the growth of Bi-2212 grains. The properties of Bi-2212 wires from SP precursor powder are close to those of the ones from CP precursor powder. Considering the much higher fabrication efficiency, SP process is useful for mass production of Bi-2212 wires.