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首页> 外文期刊>Journal of Materials Engineering and Performance >A New Vacuum Brazing Route for Niobium-316L Stainless Steel Transition Joints for Superconducting RF Cavities
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A New Vacuum Brazing Route for Niobium-316L Stainless Steel Transition Joints for Superconducting RF Cavities

机译：用于超导射频腔的铌-316L不锈钢过渡接头的新型真空钎焊工艺

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The paper describes a new approach for vacuum brazing of niobium-316L stainless steel transition joints for application in superconducting radiofrequency cavities. The study exploited good wettability of titanium-activated silver-base brazing alloy (CuSil-ABA(A (R))), along with nickel as a diffusion barrier, to suppress brittle Fe-Nb intermetallic formation, which is well reported during the established vacuum brazing practice using pure copper filler. The brazed specimens displayed no brittle intermetallic layers on any of its interfaces, but instead carried well-distributed intermetallic particles in the ductile matrix. The transition joints displayed room temperature tensile and shear strengths of 122-143 MPa and 80-113 MPa, respectively. The joints not only exhibited required hermeticity (helium leak rate < 1.1 x 10(-10) mbar l/s) for service in ultra-high vacuum but also withstood twelve hour degassing heat treatment at 873 K (suppresses Q-disease in niobium cavities), without any noticeable degradation in the microstructure and the hermeticity. The joints retained their leak tightness even after undergoing ten thermal cycles between the room temperature and the liquid nitrogen temperature, thereby establishing their ability to withstand service-induced low cycle fatigue conditions. The study proposes a new lower temperature brazing route to form niobium-316L stainless steel transition joints, with improved microstructural characteristics and acceptable hermeticity and mechanical properties.
机译：本文介绍了一种用于超导射频空腔的铌-316L不锈钢过渡接头真空钎焊的新方法。该研究利用钛活化的银基钎焊合金（CuSil-ABA（A（R）））以及镍作为扩散阻挡层的良好润湿性来抑制脆性的Fe-Nb金属间化合物形成使用纯铜填料进行真空钎焊的做法。钎焊的样品在其任何界面上均未显示任何脆性的金属间化合物层，而是在韧性基体中携带了分布良好的金属间化合物颗粒。过渡接头的室温拉伸强度和剪切强度分别为122-143 MPa和80-113 MPa。关节不仅表现出要求的气密性（氦泄漏率<1.1 x 10（-10）mbar l / s），可在超高真空下使用，而且还经受了873 K的十二小时脱气热处理（抑制了铌腔中的Q病）。 ），而组织和气密性没有明显下降。即使在室温和液氮温度之间经过十个热循环后，接头仍保持其密封性，从而确立了它们承受服务引起的低循环疲劳条件的能力。这项研究提出了一种新的低温钎焊途径，以形成铌-316L不锈钢过渡接头，该接头具有改进的微观结构特征以及可接受的气密性和机械性能。

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