Method of joining components using amorphous brazes and reactive multilayer foil
In accordance with the invention, a first body is joined to a second body by joining a first amorphous braze layer to a surface of the first body and joining a second amorphous braze layer to a surface of the second body. A reactive multilayer foil is then disposed between the first and second amorphous braze layers. The layers are pressed together and the foil is ignited. Since the bodies can be joined to the braze layers by processes that do not require a furnace and the braze-coated bodies can be joined by the foil without a furnace, the method can produce strong brazed joints in typical workshop and field environments. Preferably the amorphous braze is a bulk metallic glass.
1 . A method of joining bodies of material using amorphous brazes comprising the steps of:
providing first and second bodies of material having respective joining surfaces;
bonding said joining surface of said first body and said joining surface of said second body to respective layers or coatings of amorphous braze material;
disposing a reactive multilayer foil between said layers or coatings of amorphous braze material;
pressing said layers against said foil; and
igniting said foil.
2 . The method of claim 1 wherein said joining surfaces of said first and second bodies are bonded to said respective layers or coatings of amorphous braze material within a furnace.
3 . The method of claim 1 wherein said joining surfaces of said first and second bodies are bonded to said respective layers or coatings of amorphous braze material without a furnace.
4 . The method of claim 3 wherein said joining surfaces are bonded to said respective layers or coatings of amorphous braze material by a process selected from a group consisting of rotational friction welding, pulse current welding, electron beam welding, and explosion welding.
5 . The method of claim 3 wherein said joining surfaces are bonded to said respective layers or coatings of amorphous braze material by rotational friction welding.
6 . The method of claim 1 wherein at least one of said first and second bodies of material comprises a material selected from the group consisting of metal, ceramic, metallic glass, metal alloy, polymer, composite, and semiconductor.
7 . The method of claim 1 wherein said amorphous braze material comprises bulk metallic glass.
8 . The method of claim 1 wherein said amorphous braze material comprises quasicrystalline material.
9 . The method of claim 1 wherein said amorphous braze material comprises a two-phase structure comprising quasicrystalline phases embedded in a metallic glass matrix.
10 . The method of claim 1 wherein said amorphous braze material comprises a bulk metallic glass selected from a group consisting of Zr 52.5 Ti 5 Cu 17.9 Ni 4.6 Al 10 , Zr 57 Ti 5 Cu 20 Ni 8 Al 10 , Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 and Pd 40 Ni 40 P 20 .
11 . The method of claim 1 wherein said amorphous braze comprises a layer or coating having a thickness in the range of about 100 micrometers to ten millimeters.
12 . The method of claim 1 wherein said reactive multilayer foil includes openings or cracks to permit a flow of amorphous braze from one side of said foil into contact with amorphous braze from an opposite side of said foil.