| 摘要 |
A composite aluminum member joining process. A chemical film including potassium and fluorine is formed on an aluminum member or a flux including potassium and fluorine is coated on an aluminum member. The coated aluminum member is buried together with a disposable pattern in a predetermined assembled state in a mold including molding sand. Then, molten aluminum alloy is poured into the mold, thereby molding an aluminum alloy cast member. The mold is decompressed through the molding sand, thereby expelling tar-like substances generated when the disposable pattern comes in contact with the molten aluminum alloy, burns and vaporizes, at least from the boundary surface between the disposable pattern and the molding sand to the molding sand disposed around the disposable pattern and preventing the tar-like substances from interposing between the aluminum member and the aluminum alloy cast member made from the molten aluminum alloy. Thus, the tar-like substances are drawn in by suction and expelled at least from the boundary surface between the disposable pattern and the molding sand to the molding sand disposed around the disposable pattern before they are deposited on the surfaces of the aluminum member. As a result, the tar-like substances do not interpose between the aluminum alloy cast member and the aluminum member coated with the chemical film or the flux. Therefore, the aluminum member and the aluminum alloy cast member are joined completely, because the effects of the chemical film or the flux have not been lost.
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