A two-powder process for Bi-2223 precursors
A two-powder process for Bi-2223 precursors
复制标题
Bi-2223 前体的双粉末工艺
DOI：
10.1557/jmr.1996.0005
复制
发表时间：
1996
影响因子：
2.7
通讯作者：
D. Peterson
中科院分区：
文献类型：
--
作者：
T. Holesinger;K. V. Salazar;D. S. Phillips;B. Sargent;J. Bremser;J. Bingert;J. Willis;D. Peterson
描述了一种用于生产均匀的、细粒度的Bi₂Sr₂Ca₂Cu₃O_y（Bi - 2223）粉末的双粉末工艺。一种粉末是Bi₂.₁₋ₓPbₓSr₁.₉₋ᵧCaᵧO_z（2∶2无铜）相。另一种是近似总体组成为SrCaCu₃O_y的多相粉末。2∶2无铜相是从名义上的Bi - 2223氧化物和碳酸盐混合物中首先形成的含铋相之一。选择这种前驱体路线进行研究是因为（1）粉末具有非常相似的颗粒形态，以及（2）混合体积紧密匹配。这两个特性都有利于研磨和混合过程。发现这种前驱体混合物是稳定的，因为在烧结过程中未观察到不良相的爆炸性晶粒生长。在75K的自场中，带材中获得了高达26900A/cm²的临界电流密度。
A two-powder process is described for the production of uniform, fine-grained Bi_2Sr_2Ca_2Cu_3O_ y (Bi-2223) powders. One powder is the Bi_2.1− x Pb_ x Sr_1.9− y Ca_ y O_ z (2:2 Cu-free) phase. The other is a multi-phase powder of approximate overall composition SrCaCu_3O_ y . The 2:2 Cu-free is one of the first Bi-containing phases to form from a nominal Bi-2223 mixture of oxides and carbonates. This precursor route was chosen for investigation because (1) the powders have very similar particle morphologies and (2) the mixing volumes are closely matched. Both of these characteristics facilitate the milling and blending process. This precursor mix was found to be stable in that explosive grain growth of undesirable phases was not observed during sintering. Critical current densities up to 26,900 A/cm^2 in self field at 75 K were obtained in tapes.