| Argo-braze™ 61V is a silver-copper-indium brazing filler metal. It is manufactured only as a vacuum tube grade material with low and controlled levels of volatile impurities. The indium content of this filler metal reduces the alloy’s melting temperature and gives it improved wetting on ferrous parent metals over the straight silver-copper filler metal Argo-braze™ 72V. Argo-braze™ 61V is intended for use in fluxless atmosphere (reducing or inert gas) or vacuum brazing applications, however, it is prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible. This filler metal is typically used for brazing vacuum tube type components and for the brazing of metalized ceramics in vacuum tube devices or in the production of ceramic to metal seals. Where ceramics are being brazed to a low expansion nickel alloy care should be taken (nickel plating / stress relieving) to prevent intergranular penetration (liquid metal stress cracking) of the nickel alloy. This filler metal was formerly called IN15. Information provided by Johnson Matthey Metal Joining |
