NB3AL SUPERCONDUCTORS FOR ABOVE 850 MHZ NMR MAGNETS

在高于约10的磁场下工作的超导磁体 特斯拉主要依靠使用A15型超导体。中 A15超导体，只有Nb 3Sn和Nb 3Al基化合物是 被认为对实际应用有用。Nb 3A 1的特性是 上级于Nb 3Sn，但美国没有Nb 3Al的制造商。这项工作 将展示一种制备高性能Nb 3Al的实用方法 超导体1500 K以上的高温热处理， 用于小直径多相Nb-Al复合丝的反应 其可以在Nb 3Al相形成之后成缆。产品 将是一个高性能的灵活Nb 3A 1电缆，适合更多 可靠的反应然后风的方法来制造磁铁。阶段工作 威尔： 1)通过制造原型来建立合成的可靠性 高Jc Nb 3A 1线材。 2)制作一个原型柔性Nb 3A 1电缆适合反应- 然后风的方法。 3)评估超导和材料特性，以及规模- 向上潜力。 生产高性能和低成本的Nb 3A 1超导体 可以为美国工业提供制造高性能 场核磁共振磁铁，是由外国公司占主导地位。 拟定商业应用： 生产高性能和低成本的Nb，Al超导体 可以为美国制造高场核磁共振磁体提供领先优势 那是外国公司主导的产业。

Superconducting magnets for operation at fields higher than about 10 tesla rely principally on the use of type A15 superconductors. Among the A15 superconductors only the Nb3Sn and Nb3A1 based compounds are considered useful for practical applications. Properties of Nb3A1 are superior to Nb3Sn, but there is no US manufacturer of Nb3Al. This work will demonstrate a practical method to fabricate high performance Nb3Al superconductors. High temperature heat treatments, above 1500 K, will be used to react small diameter multifilamentary Nb-A1 composite wires which can be cabled after the formation of the Nb3A1 phase. The product will be a high performance flexible Nb3A1 cable that suits the more reliable react-then-wind approach to magnet fabrication. The phase work will: 1) Establish the reliability of the synthesis by fabricating a prototype high Jc Nb3A1 wire. 2) Fabricate a prototype flexible Nb3A1 cable suitable for the react- then-wind approach. 3) Evaluate the superconducting and material properties, and the scale- up potential. Production of high performance and cost effective Nb3A1 superconductors can provide a leading edge to the US industry for fabrication of high field NMR magnets that is dominated by foreign companies. PROPOSED COMMERCIAL APPLICATION: Production of high performance and cost effective Nb,Al superconductors can provide a leading edge to USA in fabricating high field NMR magnets that is industry dominated by foreign companies.