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SYPF: Physics of Foams

SYPF 4: Metallic Foams II

SYPF 4.2: Vortrag

Mittwoch, 10. März 2004, 17:10–17:30, H16

The decomposition behaviour of as-received and oxidized TiH₂ foaming-agent powder — •Biljana Matijasevic^1,2, Sebastian Fichter¹, Ivo Zizak¹, and John Banhart^1,2 — ¹Hahn-Meitner-Institut Berlin, SF3, SE5, SF4, Glienicker Str. 100, 14109 Berlin, Germany — ²Technical University Berlin, Institute of Material Sciences and Technology, Straße des 17. Juni 135, 10623 Berlin, Germany

Aluminium foam is created by expanding compacted mixtures of aluminium alloy powders and titanium hydride (TiH_X). As there is a mismatch between the melting point of aluminium alloys and the decomposition temperature of TiH_X, the latter should be subjected to thermal and / or oxidizing treatments to try to adjust these temperatures. The influence of various pre-treatments on the release of hydrogen from the blowing agent TiH_X is investigated. For this purpose the decomposition of TiH_X powders is examined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and mass spectrometry (MS). First in situ X-ray diffraction experiments at the synchrotron BESSY 2 combined with scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) are used to further characterize the effects of the treatments.