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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.
In order to align the grain orientation of high temperature superconductor YBa2Cu3O7-d (referred to as YBCO) and increase the critical current density, YBCO rods were grown by directional solidification method.Using optical microscope and scanning electron microscope, the directional solidification process 211 particles on YBCO microstructure and sheet growth.The results show that changing the pull rate can improve the quality of the sheet, 211 particles are the microstructure and sheet thickness of the important factors affecting the pull rate of a lower Conducive to the growth of high-quality directional structure; uniform distribution of small Y211 particles will make the sheet thickness thinning, grain boundary connectivity improve, is conducive to the growth of YBCO.