摘要
为了使高温超导体YBa2Cu3O7-d(简称YBCO)的晶粒取向排列,提高其临界电流密度,利用定向凝固方法生长YBCO棒材.采用光学显微镜、扫描电子显微镜研究了定向凝固工艺(抽拉速率和添加211粒子)对YBCO显微组织及片层生长的影响.结果表明,改变抽拉速率可以改善片层质量,211粒子是显微组织及片层厚度的重要影响因素;较低的抽拉速率有利于高质量定向结构的生长;均匀分布的细小Y211粒子会使片层厚度变薄,晶界连通性改善,有利于YBCO的生长.
The unidirectional solidification method was used in order to grow YBCO samples. Processing pa- rameter of high quality YBCO rods by unidirectional solidification method was investigated. The dependence of microstmcture on the traveling rate and dispersive distributed 211 particles were studied. The results show that high quality YBCO rods can be got by unidirectional solidification technique and high quality slices can be ob- tained with the lower vdocity. It is observed from the analysis of the influence of the 211 particles on the growth of the YBCO to different content of 211 particles that tiny and even distribution of 211 particles can help the growth of YBCO.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第5期679-681,684,共4页
Materials Science and Technology
基金
国家自然科学基金资助项目(50432050)
西北工业大学青年科技创新基金资助项目(M016201).
关键词
高温超导体
定向凝固
YBCO
抽拉速率
211粒子
high temperature superconductor
unidirectional solidification
YBCO
pulling rate
211 particles
