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Assessment of possible control of selected operational properties of metal-ceramic foams

Grabian J., Przetakiewicz W.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1 spec.

419--422

Effective use of metal foams, an increasingly popular group of machine structural materials, often requires that their properties be adjusted to customer needs. The growing popularity of foams is due to their specific properties, i.e. capability of absorbing the impact and explosion energy, increasing the stiffness of structural components such as panels of closed profiles, ability to damp vibrations, relatively good thermal insulation, dispersion of electromagnetic waves, resistance to high temperature and others. One of the operational properties of metal foams that is essential for their use in various structures is the resistance to single-axial static compression. Initial studies aimed at the determination of how metal foam behaves when statically compressed. Foam samples were made by blowing gas into liquid metal. The composition of metal foam (AlSi11) was differentiated by introducing ceramic particles SiC. By changing technological parameters of the foaming process we could affect the size of gaseous bubbles and their homogeneity. By comparing the structure of foams and their properties we found significant differences in the curve x = f(P) of foam sample affected by the force (P). It has been proved that one operational property, namely the resistance to compression, can be indirectly controlled, that is its determined specific structure can be obtained by maintaining specific technological parameters.