Brazing with Silver-Copper-Phosphorus and Copper Phosphorus alloys is widely used for the joining of Copper to Copper where the absence of a ﬂux is a major beneﬁt. The self-ﬂuxing action of the Phosphorus ensures that ﬂux entrapment problems are largely avoided and that high standards of joint soundness can be maintained.
High Phosphorus levels give excellent capillary penetration since the ﬂuidity of the molten brazing alloy is controlled by the Phosphorus content Alloys with high Phosphorus content are less ductile than those with lower Phosphorus and higher Silver contents.
For applications where optimum mechanical strength, or resistance to vibration, is required the lower Phosphorus alloys are necessary (ie Phos 5, Phos 2, Phos 0R). The tin-containing alloy, Phos 0T, offers controlled ﬂuidity, a low melting point and joints of good appearance.Phosphorus containing alloys should not be used on Ferrous or Nickel based parent alloys as they will result in brittle joints. This family of alloys can also be used for brazing high copper content alloys, providing that a suitable ﬂux is used. Phos 6N/F67 is designed for Gas Approved Applications. Phos 15 is available in Strip form for the brazing of Electrical contact material.