Regensburg 2004 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
SYPF: Physics of Foams
SYPF 4: Metallic Foams II
SYPF 4.3: Vortrag
Mittwoch, 10. März 2004, 17:30–17:50, H16
Stabilisierung flüssiger metallischer Schäume durch feste Partikel — •Thomas Wübben1, György Kaptay2, and Stefan Odenbach1 — 1ZARM, Universität Bremen — 2Universität Miskolc, Ungarn
Metal foams are porous metallic structures. Their advantageous density to stiffness ratio leads to a variety of applications especially in automotive industry.
Solid metal foams are usually produced by solidification of a liquid metallic foam. The latter is generated by the introduction of gas into a melt analogous to aqueous foams. However, while the mechanisms leading to stable aqueous foams are well understood, this is not the case for metallic foams. In contrast for example to soap foams, no surface active or polar substances are present in liquid metals. It is only known empirically that solid particles have a major influence on the stability of a liquid metallic foam.
In our presentation a model describing a possible stabilizing mechanism in metallic foams will be discussed and compared to experimental observations. One major result or our investigations is the fact that the inner surface of a metal foam is proportional to the grain size of the used powder.