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US 9,650,696 B2Granted
Method for producing an aluminium alloy foam by moulding
AssigneeConstellium Issoire
InventorsMichel Maffeis, Francois Trincat
Life of this patent
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Abstract
A method for producing an aluminum alloy foam wherein an aluminum alloy, in molten form, infiltrates the interstices of a preform of silicon elastomer elements, by means of a conventional molding process, typically a low-pressure process, followed by the elimination of the preform broken down into silica powder during the molding cycle and/or an additional baking cycle.
Claims20
A method for manufacturing an aluminium alloy foam having open cells with a porosity of from 60% to 80%, wherein the method comprises:
- extruding a silicone elastomer through a die to form silicone elastomer elements;
- cutting each of the extruded silicone elastomer elements into portions of silicone elastomer elements, each of said portions having a similar length;
- agglomerating the portions of silicone elastomer elements;
- polymerizing the agglomerated portions of silicone elastomer elements in a moulding tool to form a preform;
- removing the preform from the moulding tool;
- storing the preform at a temperature of from 80° C. to 150° C.;
- placing the preform into a mould;
- casting an aluminium alloy in the mould at a temperature of from 800° C. to 820° C., and at a pressure of from 700 mbar to 1.5 bar, to allow the alloy to penetrate into interstices of the preform, thereby forming an aluminium alloy foam and silica powder;
- and
- removing the aluminium alloy foam from the mould.
7 more elements
Dependencies are inferred from the claim text.