Method for manufacturing an integrally-formed alloy structure having a brazing surface

Abstract

A method for manufacturing an integrally-formed alloy structure having a brazing surface includes the following steps. Firstly, a magnesium-containing alloy is provided. Next, the magnesium-containing alloy is heat treated to obtain a vacuum heat-treated alloy structure. Then, the top surface of the vacuum heat-treated alloy structure is reduced to expose the brazing surface. Finally, the integrally-formed alloy structure having the brazing surface is formed.

What is claimed is: 
     
         1 . A method for manufacturing an integrally-formed alloy structure having a brazing surface, comprising:
 providing a magnesium-containing alloy;   heat treating the magnesium-containing alloy in a vacuum furnace;   obtaining a vacuum heat-treated alloy structure, wherein the vacuum heat-treated alloy structure includes a magnesium-rich layer, a magnesium-deficient layer and an original magnesium-content layer, the magnesium-rich layer is integrally formed on the magnesium-deficient layer, the magnesium-deficient layer is integrally formed on the original magnesium-content layer, the magnesium-rich layer has a higher magnesium content than the original magnesium-content layer, and the magnesium-deficient layer has a lower magnesium content than the original magnesium-content layer; and   performing a surface reduction treatment on the vacuum heat-treated alloy structure to reduce the magnesium-rich layer to expose the brazing surface of the magnesium-deficient layer underneath the magnesium-rich layer, so as to form the integrally-formed alloy structure having the brazing surface.   
     
     
         2 . The method according to  claim 1 , wherein the vacuum heat-treated alloy structure is formed at a temperature of between 500° C. and 600° C. 
     
     
         3 . The method according to  claim 2 , wherein the vacuum heat-treated alloy structure is formed by maintaining the temperature for a period of time longer than 30 minutes. 
     
     
         4 . The method according to  claim 3 , wherein the vacuum heat-treated alloy structure is formed at a vacuum degree of lower than 10 −4  torr. 
     
     
         5 . The method according to  claim 1 , wherein a thickness of the magnesium-deficient layer is formed more than 10 μm. 
     
     
         6 . The method according to  claim 1 , wherein the magnesium-containing alloy is a 6000-series aluminum alloy containing magnesium.