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2. 发明授权

US06699821B2 Nb3Al superconductor and method of manufacture 有权
标题翻译： Nb3Al超导体及其制造方法
公开(公告)号：US06699821B2
公开(公告)日：2004-03-02
申请号：US10119353
申请日：2002-04-09
申请人： Mark K. Rudziak , Leszek R. Motowidlo , Terence Wong
发明人： Mark K. Rudziak , Leszek R. Motowidlo , Terence Wong
IPC分类号： B22F320
CPC分类号： C22C27/02 , B22F3/1216 , B22F5/12 , B22F2998/00 , B22F2998/10 , H01L39/2409 , Y10S420/901 , B22F3/04 , B22F2202/01 , B22F1/0003 , B22F3/18 , B22F3/20
摘要： A Nb3Al superconducting wire and method for fabricating the same wherein Nb and Al powders in combination, or Nb—Al alloy powders are encapsulated in a metal tube, preferably copper or copper-alloy (e.g., CuNi), and the resultant composite is processed by conventional means to fine wire. Multifilamentary composites are produced by rebundling of the powder-filled wires into metal tubes followed by conventional processing to wire of a desired size. It is required for the use of Nb and Al powders in combination that the Nb and Al powder particle size be less than 100 nm. In the use of Nb—Al alloy powders, it is preferred, but not required, that the powder particle size be similarly of a nanometer scale. The use of nanometer-scale powders is beneficial to wire fabrication, allowing the production of long wire piece-lengths. At final wire size, the wires produced by practice of the present invention are heat treated at temperatures below the melting point of copper (1083° C.), with the heat treatment causing conversion of the powder cores or filaments to the A15 superconductor Nb3Al. The resulting superconducting wires display critical superconducting properties previously achievable only by methods employing temperatures well in excess of the melting point of copper.
摘要翻译：一种Nb3Al超导线及其制造方法，其中组合的Nb和Al粉末或Nb-Al合金粉末封装在金属管中，优选铜或铜合金（例如CuNi）中，并且所得复合材料由常规手段细线。通过将粉末填充的线重新连接到金属管中，然后通过常规加工成所需尺寸的导线来生产多丝复合材料。需要组合使用Nb和Al粉末，Nb和Al粉末粒度小于100nm。在使用Nb-Al合金粉末时，优选但不是要求粉末粒径类似于纳米级。使用纳米级粉末有利于电线制造，允许生产长的电线片长度。在最终丝尺寸下，通过实施本发明生产的丝线在低于铜熔点（1083℃）的温度下进行热处理，热处理引起粉末芯或细丝转化为A15超导体Nb3Al。所得到的超导线材显示出仅通过使用超过铜熔点的温度的方法才能达到的临界超导特性。

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