Iron-and nickle-based brazing foil and method for brazing
An amorphous, ductile brazing foil is produced with a composition of Fe a Ni b Cr c Si d B e Mo f P g with 25≦a≦50 atomic %; 30≦b≦45 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities, wherein 10≦d+e+g≦28 atomic % with a+b+c+d+e+f+g=100. Excellent brazing joints can be produced with these brazing foils.
1 . An amorphous, ductile brazing foil of a composition consisting essentially of
Fe a Ni b Cr c Si d B e Mo f P g
wherein 25≦a≦51 atomic %; 25≦b≦50 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities,
wherein 10≦d+e+g≦28 atomic %, and a+b+c+d+e+f+g=100.
2 . An amorphous, ductile brazing foil of a composition consisting essentially of
Fe a Ni b Cr c Si d B e Mo f P g
wherein 25≦a≦50 atomic %; 30≦b≦45 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities,
wherein 12≦d+e+g≦24 atomic % and a+b+c+d+e+f+g=100.
3 . The amorphous, ductile brazing foil according to claim 1 ,
wherein the Si content is such that 5≦d≦13 atomic %
4 . The amorphous, ductile brazing foil according to claim 1 ,
wherein the B content is such that 4≦e≦12 atomic %.
5 . The amorphous, ductile brazing foil according to claim 1 ,
having a liquidus temperature of less than 1200° C.
6 . The amorphous, ductile brazing foil according to claim 1 ,
wherein the brazing foil is at least 50% 80% amorphous.
7 . An amorphous, ductile brazing foil according to claim 1 ,
wherein the foil has a thickness D of more than 30 μm.
8 . An amorphous, ductile brazing foil according to claim 7 ,
wherein the foil has a thickness D, such that 40 μm≦D≦80 μm.
9 . An amorphous, ductile brazing foil according to claim 1 ,
wherein the foil has a width B, such that 20 mm≦B≦300 mm.
10 . An amorphous, ductile brazing foil according to claim 9 ,
wherein the foil has a width B≧40 mm.
11 . (canceled)
12 . (canceled)
13 . A method for joining two or more metal components by adhesive force, comprising:
introducing the amorphous, ductile brazing foil according to claim 1 between two or more metal components to be joined, wherein the metal components to be joined have a higher melting temperature than the brazing foil to form a brazing composite;
heating the brazing composite to a temperature above the liquidus temperature of the brazing foil;
cooling the brazing composite, thereby forming a brazing joint between the metal components.
14 . The method for joining two or more metal components by adhesive force according to claim 13 ,
wherein the metal components to be joined comprise two or more components of a heat exchanger or an exhaust gas recirculation cooler or a fuel cell.
15 . A method for joining two or more metal components by adhesive force, comprising:
providing a melt of Fe a Ni b Cr c Si d B e Mo f P g wherein 25≦a≦50 atomic %; 25≦b≦51 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities, wherein 10≦d+e+g≦28 atomic % with a+b+c+d+e+f+g=100;
producing an amorphous brazing alloy foil by rapid solidification of the melt on a moving cooling surface at a cooling rate of more than approximately 10 5 ° C./s;
forming a brazing composite by applying the brazing alloy foil between the metal components;
heating at least a portion of the brazing composite to a temperature above the liquidus temperature of the brazing alloy foil;
cooling the brazing composite, thereby forming a brazing joint between the metal components.
16 . A method for joining two or more metal components by adhesive force, comprising:
providing a melt of Fe a Ni b Cr c Si d B e Mo f P g with wherein 25≦a≦50 atomic %; 30≦b≦45 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities, wherein 10≦d+e+g≦28 atomic % with a+b+c+d+e+f+g=100;
producing an amorphous brazing alloy foil by rapid solidification of the melt on a moving cooling surface at a cooling rate of more than approximately 10 5 ° C./s;
forming a brazing composite by applying the brazing alloy foil between the metal components;
heating the brazing composite to a temperature above the liquidus temperature of the brazing alloy foil;
cooling the brazing composite, thereby forming a joint between the metal components.
17 . (canceled)
18 . (canceled)
19 . (canceled)
20 . The amorphous, ductile brazing foil according to claim 6 , wherein the brazing foil is at least 80% amorphous.
21 . An apparatus comprising two or more parts joined by at least one brazing seam produced by an amorphous, ductile brazing foil of a composition consisting essentially of
Fe a Ni b Cr c Si d B e Mo f P g
wherein 25≦a≦51 atomic %; 25≦b≦50 atomic %; 5<c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities,
wherein 10≦d+e+g≦28 atomic %, and a+b+c+d+e+f+g=100.
22 . The apparatus according to claim 21 , wherein the apparatus is a heat exchanger, an exhaust gas recirculation cooler, or a fuel cell.
23 . The apparatus according to claim 22 , wherein the apparatus is a heat exchanger.
24 . The apparatus according to claim 23 , wherein the brazing seam has a thickness D>30 μm.
25 . The apparatus according to claim 21 , wherein at least one of said two or more parts comprise a metal component made from stainless steel, nickel alloy, cobalt alloy, or a combination thereof.
26 . A method for producing an amorphous, ductile brazing foil, comprising:
providing a melt of Fe a Ni b Cr c Si d B e Mo f P g wherein 25≦a≦51 atomic %; 25≦b≦50 atomic %; 5≦c≦15 atomic %; 4≦d≦15 atomic %; 4≦e≦15 atomic %; 0≦f≦5 atomic %; 0≦g≦6 atomic %; and any impurities, wherein 10≦d+e+g≦28 atomic % with a+b+c+d+e+f+g=100; and
rapidly solidifying the melt on a moving cooling surface at a cooling rate of more than approximately 10 5 ° C./s to produce an amorphous brazing alloy foil.
27 . The method of claim 26 , wherein Ni is present in an amount such that 30≦b≦45 atomic %.