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<p>This paper presents the results of a study on the structural formation of brazed joints between Kovar alloy and stainless-steel steel using Cu-Mn-4.5Co and Cu-Mn-4.5Co-2.5Fe filler metals. Local micro-X-ray spectral analysis has established that the structure of brazed dissimilar joints by using both brazing filler metal is two-phase, containing a solid solution based on the copper-manganese system and a phase enriched in iron. The research investigates the influence of the brazing gap size and the contact interaction processes between the filler metal components and the base metals (Kovar and stainless steel) on the resulting microstructure of the brazed joints. Metallographic analysis and micro-X-ray spectral studies revealed that variations in the brazing gap width significantly affect the kinetics of diffusion interactions, ultimately determining the morphology, phase composition, and distribution of structural components in brazing seam. It was found that reducing the brazing gap from 100 to 20 μm in conjunction with using Cu-Mn-4.5Co-2.5Fe filler metal contributes to an increase of the amount of γ-phase Fex(MnyCozMe) and a decrease in the proportion of solid solution based on the copper-manganese system in the brazed seam and ensures equal strength of the brazed joints between Kovar and stainless steel.</p>

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Features of joint structure formation between Kovar and stainless steel using Cu-Mn-Co(Fe) brazing alloy

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Svitlana Maksymova,
  • Petro Kovalchuk,
  • Vitalii Voronov

摘要

This paper presents the results of a study on the structural formation of brazed joints between Kovar alloy and stainless-steel steel using Cu-Mn-4.5Co and Cu-Mn-4.5Co-2.5Fe filler metals. Local micro-X-ray spectral analysis has established that the structure of brazed dissimilar joints by using both brazing filler metal is two-phase, containing a solid solution based on the copper-manganese system and a phase enriched in iron. The research investigates the influence of the brazing gap size and the contact interaction processes between the filler metal components and the base metals (Kovar and stainless steel) on the resulting microstructure of the brazed joints. Metallographic analysis and micro-X-ray spectral studies revealed that variations in the brazing gap width significantly affect the kinetics of diffusion interactions, ultimately determining the morphology, phase composition, and distribution of structural components in brazing seam. It was found that reducing the brazing gap from 100 to 20 μm in conjunction with using Cu-Mn-4.5Co-2.5Fe filler metal contributes to an increase of the amount of γ-phase Fex(MnyCozMe) and a decrease in the proportion of solid solution based on the copper-manganese system in the brazed seam and ensures equal strength of the brazed joints between Kovar and stainless steel.