New hermetic sealing material for vacuum brazing of stainless steels

18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium

Hildebrandt, S.^1 ; Wiehl, G.^1 ; Silze, F.^2

Umicore AG and Co.KG, Rodenbacher Chaussee 4, Hanau

63457, Germany^1

Institut für Komplexe Materialien, Helmholtzstr. 20, Dresden

01069, Germany^2

关键词: Brazed joint;    Copper-based;    Hermetic sealing;    In-vacuum;    Low partial pressures;    Silver content;    Umicore;    Wetting behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/118/1/012004/pdf
DOI  :  10.1088/1757-899X/118/1/012004

来源: IOP

【 摘 要 】

For vacuum brazing applications such as in vacuum interrupter industry Hermetic Sealing Materials (HSM) with low partial pressure are widely used. AgCu28 dominates the hermetic sealing market, as it has a very good wetting behavior on copper and metallized ceramics. Within recent decades wetting on stainless steel has become more and more important. However, today the silver content of HSMs is more in focus than in the past decades, because it has the biggest impact on the material prices. Umicore Technical Materials has developed a new copper based HSM, CuAg40Ga10. The wettability on stainless steel is significantly improved compared to AgCu28 and the total silver content is reduced by almost 44%. In this article the physical properties of the alloy and its brazed joints will be presented compared to AgCu28.