Surface-modified aluminum alloy substrate structure
A surface-modified aluminum alloy substrate structure includes a 6000-Series aluminum alloy substrate, a diffusion buffer layer, and a meltable metallic layer. The diffusion buffer layer is formed on the 6000-Series aluminum alloy substrate for buffering magnesium in the 6000-Series aluminum alloy substrate from diffusing to a meltable metallic layer. The meltable metallic layer is formed on the diffusion buffer layer for being melted in a subsequent process.
1 . A surface-modified aluminum alloy substrate structure, comprising:
a 6000-Series aluminum alloy substrate;
a diffusion buffer layer formed on the 6000-Series aluminum alloy substrate for buffering magnesium in the 6000-Series aluminum alloy substrate from diffusing to a meltable metallic layer;
a meltable metallic layer formed on the diffusion buffer layer for being melted in a subsequent process; and
a brazing promotion layer formed on the meltable metallic layer for enhancing a eutectic reaction; wherein the brazing promotion layer is made of an alloy that includes copper, nickel, and zinc.
2 . The surface-modified aluminum alloy substrate structure according to claim 1 , wherein the diffusion buffer layer is made of one of a 3000-Series aluminum alloy and a 1000-Series aluminum alloy.
3 . The surface-modified aluminum alloy substrate structure according to claim 2 , wherein the diffusion buffer layer is a thin layer formed on the 6000-Series aluminum alloy substrate by rolling and has a thickness of 1 mm or less.
4 . The surface-modified aluminum alloy substrate structure according to claim 1 , wherein the meltable metallic layer is an aluminum-silicon alloy layer.
5 . The surface-modified aluminum alloy substrate structure according to claim 4 , wherein the meltable metallic layer is a thin layer formed on the diffusion buffer layer by rolling and has a thickness of 0.3 mm or less.
6 . The surface-modified aluminum alloy substrate structure according to claim 1 , wherein the brazing promotion layer is an extremely thin layer formed on the meltable metallic layer by rolling and has a thickness of 0.005 mm or less.
7 . The surface-modified aluminum alloy substrate structure according to claim 1 , wherein the brazing promotion layer is an extremely thin layer formed on the meltable metallic layer by physical vapor deposition and has a thickness of 0.005 mm or less.