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<p>In the present study, the Ni-based brazing filler metal Ni&#xa0;650 was modified by the addition of Ni particles with varying particle sizes and contents, with the aim of systematically tailoring the melting behavior, microstructure, and mechanical properties of brazed joints. During brazing, the particles are intended to dissolve in the molten filler metal, shifting its composition toward a higher Ni content. This results in an in-situ modified joint composition with increased Ni content. The results show that the solidus temperature and the liquidus temperature of the modified filler metals can be increased. Consequently, brazed joints produced with the modified filler metals can be used at higher operating temperatures. Microstructural investigations of brazed joints using a Ni-based superalloy and a stainless-steel as substrate show that the increased Ni content in the modified filler metals reduces the formation of brittle phases in the seam and alters their morphology. As a result, significantly higher joint strengths can be achieved: The tensile strength increases by a maximum factor of 1.5 for the Ni-based superalloy and 2.8 for the stainless steel. In summary, the results demonstrate that modification with Ni particles significantly enhances both the thermal stability and the mechanical performance of brazed joints. The modification approach is straightforward, requiring only the addition of particles while maintaining existing brazing processes and materials unchanged.</p>

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Modification of Ni 650 filler metal by Ni Particle addition: Effects on melting, flow behavior, microstructure, and joint strength

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Susann Hausner,
  • Guntram Wagner

摘要

In the present study, the Ni-based brazing filler metal Ni 650 was modified by the addition of Ni particles with varying particle sizes and contents, with the aim of systematically tailoring the melting behavior, microstructure, and mechanical properties of brazed joints. During brazing, the particles are intended to dissolve in the molten filler metal, shifting its composition toward a higher Ni content. This results in an in-situ modified joint composition with increased Ni content. The results show that the solidus temperature and the liquidus temperature of the modified filler metals can be increased. Consequently, brazed joints produced with the modified filler metals can be used at higher operating temperatures. Microstructural investigations of brazed joints using a Ni-based superalloy and a stainless-steel as substrate show that the increased Ni content in the modified filler metals reduces the formation of brittle phases in the seam and alters their morphology. As a result, significantly higher joint strengths can be achieved: The tensile strength increases by a maximum factor of 1.5 for the Ni-based superalloy and 2.8 for the stainless steel. In summary, the results demonstrate that modification with Ni particles significantly enhances both the thermal stability and the mechanical performance of brazed joints. The modification approach is straightforward, requiring only the addition of particles while maintaining existing brazing processes and materials unchanged.