Patent ID: 8894780

Claim:
An apparatus comprising two or more parts joined by a braze comprising: a composition consisting essentially of: Fe a Ni rest Si b B c M d wherein approximately 10 atomic percent≦a≦approximately 35 atomic percent, 1 atomic percent≦b≦15 atomic percent, 5 atomic percent<c≦15 atomic percent, 0≦d≦4 atomic percent, rest Ni and incidental impurities, wherein M is one or more of the elements Co, Cr, Mn, Nb, Mo, Ta, Cu, Ag, Pd or C; and wherein said braze has a liquidus temperature T L ≦1025° C. and has been formed from an at least 50% amorphous, ductile brazing foil having a thickness D, where 10 μm≦D≦100 μm, wherein the apparatus comprises a heat exchanger or a component thereof having at least one solder seam produced with said braze.