Abstract Dissimilar brazing of titanium (Ti) and copper (Cu) using Ag-based braze and niobium (Nb) diffusion barrier was investigated. It was found that the addition of a Nb interlayer can effectively block the interaction between Ti substrate and molten braze, thus completely eradicate the formation of brittle intermetallic compounds (IMCs). This leads to a brazed joint consisting of Ti-Nb solid solution, remnant Nb interlayer and Ag-Cu braze. The resultant IMCs free joint exhibits superior structural integrity with bonding strength exceeding that of the Cu substrate. Meanwhile, negligible dissolution of Nb into molten braze and sluggish solid-state diffusion at the Ti/Nb interface keep the Nb interlayer intact, enabling excellent reliability of the joint.

中文翻译：

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使用铌扩散阻挡层将钛与铜钎焊牢固可靠

摘要 研究了使用银基钎料和铌 (Nb) 扩散阻挡层对钛 (Ti) 和铜 (Cu) 进行异种钎焊。研究发现，Nb 夹层的加入可以有效阻断 Ti 基体与熔融钎料之间的相互作用，从而彻底杜绝脆性金属间化合物（IMCs）的形成。这导致钎焊接头由 Ti-Nb 固溶体、残余 Nb 夹层和 Ag-Cu 钎焊组成。所得的 IMC 自由接头表现出优异的结构完整性，其结合强度超过了 Cu 基板的结合强度。同时，Nb 可忽略不计地溶解到熔融钎料中，并且 Ti/Nb 界面处固态扩散缓慢，使 Nb 夹层保持完整，从而使接头具有出色的可靠性。