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solder replacement adhesives
Johnson Matthey Sil-fos™ 6 6% Silver-Copper-Phosphorus Brazing Filler Metal
Categories: Metal; Nonferrous Metal; Copper Alloy; Solder/Braze Alloy

Material Notes: Sil-fos™6 is used to braze copper and copper alloys. When brazing copper the phosphorus within the alloy imparts a metallurgical based self-fluxing capability. When Sil-fos™6 is used to join copper alloys (such as brass, bronze or gun metal) a separate flux will be required because the self-fluxing action only occurs on copper.

This filler metal should not be used to braze iron containing materials like carbon or stainless steels or nickel containing materials as the phosphorus within the filler metal will form brittle, intermetallic, phosphide compounds at the joint interface. Sil-fos™6 is not suitable for use in sulfurous atmospheres at elevated service temperatures.

When selecting a brazing filler metal from the Sil-fos™ range it is necessary to understand about the flow and ductility of the different products. Phosphorus is the key element, the higher this is the more free flowing the filler metal, but the lower its ductility. Silver is used to improve the filler metal’s ductility, but reduces its flow properties.

Sil-fos™6 is one of the most free flowing filler metals from the Sil-fos™ range. However, due to its high phosphorus content it is one of the least ductile. The low ductility of the alloy imparts it with glass like properties, making it both ‘notch’ sensitive and sensitive to impact type loadings. This filler metal should therefore not be used in applications involving exposure to strong vibration, impact loads or where some deformation of the joint might be expected in service. Sil-fos™6 is best suited for making copper joints that are of the true capillary type and where tight joint clearances of 0.025-0.075 mm are used. When used in such joints, the poor mechanical properties of the filler metal are exposed and satisfactory joints, suitable for use in all but the most extreme conditions can generally be produced.

Sil-fos™6 is extensively used in refrigeration and air conditioning applications for flux-free brazing of copper pipes and tubes. It is also used for joining copper in electrical engineering applications.

Information provided by Johnson Matthey Metal Joining

Vendors:
Available Properties
  • Melting Point
  • Solidus
  • Liquidus
  • Copper, Cu
  • Phosphorous, P
  • Silver, Ag
  
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Solder ReplacementRoHS Compliant Adhesives for Solder Replacement
Master Bond offers RoHS compliant, electrically conductive systems to replace lead soldering. These epoxy and silicone adhesives offer low volume resistivity, low outgassing and high temperature resistance.
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