Pushing and trapping phenomena in YBa2Cu3O7 melt-textured composites with BaZrO3 and Ag additions
Pushing and trapping phenomena in YBa2Cu3O7 melt-textured composites with BaZrO3 and Ag additions
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添加 BaZrO3 和 Ag 的 YBa2Cu3O7 熔体织构复合材料中的推入和俘获现象
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
X. Obradors
中科院分区：
文献类型：
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作者：
A. E. Carrillo;T. Puig;X. Obradors
在熔融织构的YBa_2Cu_3O_7/Ag复合材料中发现了一种新的Ag捕获颗粒形态，其中BaZrO_3添加剂增强了颗粒夹杂物与固体基体之间的界面能。增强的推动效应产生方形状的宏观偏析带，其中二次添加剂Y2 BaCuO 5，BaZrO 3和Ag被积累。结果表明，细长的Ag颗粒的长轴和纵横比高达一个可以被困在YBa_2Cu_3O_7矩阵没有任何其他添加剂具有非常各向异性的取向。结果表明，在顶部籽晶生长产生的所有生长扇区中，细长的Ag颗粒的长轴平行于生长方向。用推捕理论定性地解释了夹杂物颗粒生长诱导形态形成的异常现象。
A new Ag trapped particle morphology has been discovered in melt-textured YBa2Cu3O7/Ag composites where the interface energy between particle inclusions and a solid matrix has been enhanced with BaZrO3 additives. The enhanced pushing effect generates square-like macrosegregation bands where the secondary additives Y2BaCuO5, BaZrO3, and Ag are accumulated. It is shown that elongated Ag particles with a long axis and aspect ratios as high as a can be trapped in the YBa2Cu3O7 matrix free of any other additive with a very anisotropic orientation. It is demonstrated that the elongated Ag particles lie with the long axis parallel to the growth direction in all the growth sectors generated by the top seeding growth. The pushing–trapping theory is used to explain qualitatively the unusual phenomenon of a growth-induced morphological shaping of inclusion particles.