Crack reduction in a large bulk Y–Ba–Cu–O superconductor through liquid binder addition

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• 作者：A. Wongsatanawarid ; H. Seki ; S. Kobayashi ; M. Murakami
• 关键词：Large bulk YBaCuO ; Crack reduction ; Liquid binder
• 刊名：Physica C
• 出版年：2010
• 出版时间：1 November 2010
• 年：2010
• 卷：470
• 期：20
• 页码：1167-1169
• 全文大小：684 K

文摘

We have studied the effects of the incorporation of polyvinyl acetate (PVA) aqueous solution on the formability of the precursor Y–Ba–Cu–O samples with the aim of improving the mechanical properties of large bulk RE–Ba–Cu–O superconductors that are susceptible to cracking. We found that the green compacts of YBa₂Cu₃O_y and Y₂BaCuO₅ powders added with PVA liquid binder exhibited good mechanical properties and could be mechanically machined without defects. We could successfully drill 17 holes of 1 mm diameter into the green compact. The drilled samples were subjected to melt-processing and oxygen annealing, and further characterized with microstructural observations and magnetization measurements. The results showed that liquid binder addition was very effective in reducing cracks for large melt-processed Y–Ba–Cu–O superconductors.