Patent ID: 7451906

Claim:
A brazing product for fluxless brazing comprising a filler metal-forming composition comprised of a plurality of layers, including: (a) at least one temperature modifier layer, wherein said at least one temperature modifier layer has an overall zinc content of about 25-100% by weight of the at least one temperature modifier layer, an overall aluminum content of up to about 65% by weight of the temperature modifier layer, and an overall silicon content of up to about 18% by weight of the temperature modifier layer; and (b) at least one braze-promoting layer, wherein said at least one braze-promoting layer comprises at least one braze-promoting metal selected from nickel, cobalt, iron and palladium; wherein the filler metal-forming composition melts completely at a braze temperature in the range of about 380-575° C.; wherein said at least one braze-promoting layer comprises said at least one braze-promoting metal in an amount of from about 1-10% by weight of the filler metal-forming composition; and wherein said at least one temperature modifier layer comprises zinc in an amount of about 25-99% by weight of the filler metal-forming composition, aluminum in an amount of up to about 65% by weight of the filler metal-forming composition, and silicon in an amount of up to about 18% by weight of the filler metal-forming composition.