| 摘要 |
PURPOSE: Provided is a preparation method of foamed aluminum which is characterized in that thickened Al-melt is foamed and cooled in a chamber equipped with a foaming furnace and a mold unlike a conventional direct pouring method demanding separate foaming and cooling furnaces. Accordingly, the method prepares high quality foamed alumina in a low cost and high yield. CONSTITUTION: The preparation method comprises the steps of: thickening Al-melt by adding stabilized Ca alloy, Ca-10-30wt.% of Al alloy, to Al-melt(700-750deg.C) in a thickening furnace; pouring the thickened Al-melt into a foaming space formed by the side wall(3) of a foaming furnace(C) and the bottom of a cooling mold(6) in a chamber(1), where the foaming furnace of a cylindrical shape without a bottom and the mold combined closely to the foaming furnace are positioned on a upper and a lower part of the chamber, respectively; closing the foaming furnace with a first cover(12); adding a foaming agent, 1.0-5wt.% of TiH2, with stirring and heating; descending the lower mold when foaming is stared, which leads to release the combine between foaming furnace and mold, resulting in flowing the foamed Al-melt into the mold; closing the mold with a second cover; and cooling. |
