CN 121023279 A

摘要

本发明公开了一种大规格高纯超导铌锭的制备方法，该方法包括如下步骤：将纯度99.99%的Nb2O5与铝粉按质量比3:1~1.2混合，在氩气保护和真空条件下发生铝热还原反应，生成铌铝中间合金；将所得合金破碎后在600 kW水平电子束炉中熔炼，得到致密化铌板；铌板剪切成铌条并捆扎，在1200 kW垂直电子束炉中进行一次熔炼，获得直径300 mm的超导铌锭；再在1600 kW电子束炉中扩径熔炼，获得直径400 mm、残余电阻比（RRR）不低于400的超导铌锭。该方法通过优化熔炼参数组合、真空条件与热场控制，显著提升了铌锭的纯度、尺寸均一性及晶粒结构稳定性，克服了现有技术中难以兼顾大尺寸成形与高RRR值的技术瓶颈，适用于高能物理、MRI、可控核聚变等超导关键部件制造需求。

英文（機器翻譯）： The invention discloses a preparation method of a large-size high-purity superconducting niobium ingot, which comprises the following steps of mixing Nb 2O5 with purity of 99.99% with aluminum powder according to a mass ratio of 3:1-1.2, carrying out aluminothermic reduction reaction under the protection of argon and under vacuum conditions to generate a niobium-aluminum intermediate alloy, crushing the obtained alloy, smelting in a 600 kW horizontal electron beam furnace to obtain a densified niobium plate, shearing the niobium plate into niobium strips and bundling, carrying out primary smel…

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