Production of metal forms
View Patent ↗The invention relates to a process for producing metal foams of controlled structure and to the metal bodies in foam form obtained in this way, wherein metals from group IB to VIIIB of the periodic system of the elements are added before and/or during the formation of the foam.
1. A process for preparing an aluminum or an aluminum alloy metal foam which comprises forming a matrix comprising the aluminum or aluminum metal alloy and magnesium hydride and adding, either before foaming or during foaming the matrix, 0.001% to 1% by weight, based on the aluminum or aluminum metal alloy, a metallic additive selected from the group consisting of a Group IB to Group VIIIB metal powder and mixture of said metal powders.
2. The process according to claim 1 , wherein the aluminum or the aluminum metal alloy is in the form of a powder.
3. The process according to claim 1 , wherein the Group IB to VIIIB metal is selected from the group consisting of titanium, copper, iron, vanadium and a mixture of said metals.
4. The process according to claim 1 , wherein the amount is from about 0.01% to about 0.1% by weight.
5. The process according to claim 1 , wherein the magnesium hydride is present in an amount from about 0.1% to about 5% by weight, based upon the aluminum or aluminum metal alloy that is to be foamed.
6. The process according to claim 1 , wherein the magnesium hydride is autocatalytically produced.
7. The process according to claim 1 , wherein the foaming occurs by compacting the matrix comprising the aluminum or aluminum alloy powder and the magnesium hydride, placing the compacted matrix into a preform, and heating the perform to a temperature which is higher than the liquidus temperature of the aluminum or aluminum metal alloy and the decomposition temperature of the magnesium hydride.
8. The process according to claim 1 , wherein the matrix comprises an aluminum metal melt and the magnesium hydride has been stirred into the aluminum metal melt.