Process Cymat Technologies

stabilized aluminum foam cast cymat technologies.



consist of alumina, titanium diboride, zirconia, silicon carbide, silicon nitride or solid stabilizer materials
must compose of less 25 vol% of mmc
particulate sizes must range 0.5 μm – 25 μm, preferably in range of 1 μm 20 μm

though controversial topic, accepted presence of solid particles aid in stabilization of bubbles. thought particulate aids in foam stability via following mechanisms:

increase bulk liquid viscosity






slows flow of molten metal through cell walls maintain stable structure.






creates mechanical disjoining pressure






a repulsive force helps maintain cell wall thickness between 2 adjacent cells.






reduction in drainage






presence of particulate in foam helps impede flow of molten metal in direction of gravity obstructing cell walls , sustaining liquid.

the process creation of stabilized aluminum foam , can broken down these 4 rudimentary steps:

once raw mmc melted, transferred foaming apparatus gas injected melt , dispersed using either rotating impellers or vibrating nozzles. bubbles rise surface , resultant metal foam mixture cast rise out of foaming apparatus due density relative of molten mmc. metallic foam being cast, simultaneously drawn off surface by, example, conveyor belt. while drawn off, cooled , forms porous metallic structure.