Metal foams physics by CarolinKorner

By CarolinKorner

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UN 26 CO Metals are able to absorb large amounts of hydrogen with a very high volumetric hydrogen density, even higher than that of liquid hydrogen. Especially light metal hydrides, e. g. 1. Generally, the reaction is exothermic and reversible, i. e. hydrogen is desorbed again by heat treatment. 1: Properties of various hydrides [204]. 27 As the hydrogen pressure pH2 increases, saturation of the matrix occurs and the β phase, which is the metal hydride MeHx , starts to form: 1 (x − y)H2 ←→ MeHx .

4 mm. (µCT measurement) During HP-IFM the mold is first completely filled before foam formation is initiated by mold expansion. Wetting of the mold walls is thus not an issue. 2 and lower can be realized. Limitations appear when the foaming material is no more able to close the evolving gap during mold expansion. 1 Influence of the Wall Thickness RR EC Generally, the attainable relative density is a function of the thickness of the cast part. Higher thicknesses allow higher porosities. 3 The influence of the thickness of the casting on the density profile is depicted for LP-IFM in Fig.

3. UN 17 CO RR principal difference in the processing of aluminum and magnesium. Generally, the time available for foam formation is shorter for magnesium than for aluminum. A clear benefit of LP-IFM is its intrinsic simplicity. The necessary modifications of the permanent steel mold for the admixing of the blowing agent are insignificant. The casting process is analogous to standard die casting with respect to melt temperature, mold temperature and casting velocity. The only difference is that the mold is not completely filled during molding.

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