Preform for manufacturing a metal foam
AssigneeFiltrauto
InventorFrederic Poggi
Life of this patent
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Abstract
A preform intended for the manufacture of a metal foam having a porosity of between 62% and 85%, the preform including a set of precursors in the form of balls formed of a mixture of 12% to 25% of organic binder, 72% to 87% of sodium chloride and 1 to 3% of kalinite. The precursors have a diameter of around 1 mm to 10 mm, and preferably 4 mm, the precursors being obtained by granulating the mixture using a fluidized bed process.
Claims15
A process for manufacturing a metal foam using a preform having a porosity of between 62% and 85%, the preform including a set of precursors in the form of balls formed of a mixture of 12% to 25% of organic binder, 72% to 87% of sodium chloride and 1 to 3% of kalinite, the process comprising the following steps:
- providing the precursors into a mould;
- vibrating the mould to define free spaces;
- heating the mould to a temperature between 300° C. and 600° C. to activate the kalinite, and injecting an air flow into the mould during the rise in temperature;
- maintaining the temperature of the heated mould for 10 minutes to 40 minutes;
- pouring a molten metal in the mould to fill the free spaces between the precursors;
- and
- cooling the molten metal to form the metal foam;
- and
- washing the metal foam.
Dependencies are inferred from the claim text.