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Ti2AlC and Ti3SiCi2 MAX phase foams: Processing, porosity characterization and connection between processing parameters and porosity

 
: Velasco, B.; Hutsch, T.; Weißgärber, T.; Gordo, E.; Tsipas, S.A.

European Powder Metallurgy Association -EPMA-:
World PM 2016 Congress & Exhibition. USB Proceedings : The Powder Metallurgy World Congress, Hamburg, 9.-13.10.2016
Shrewsbury: EPMA, 2016
ISBN: 978-1-899072-48-4
6 S.
Powder Metallurgy World Congress & Exhibition (PM) <2016, Hamburg>
Englisch
Konferenzbeitrag
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Abstract
MAX phases Ti2AlC and Ti3SiCi2 foams with controlled porosity and pore size were produced using the space holder method. The foams were processed using water-leachable crystalline carbohydrate as space holder that involves: mixing, cold isostatic pressing, dissolution and sintering. Three combinations of volume percentage (20%-60%) and size distribution (250-1000 µm) of space holder were introduced during mixing. The foams were characterized and compared with the material without space holder. The characterization included: morphology (overall, open and closed porosity by Archimedes method) and gas permeability. Foams with porosity up to about 60 vol% and pore size distribution ranging from about 250 to 1000 μm were produced. Experimental porosity was compared to the theoretical expected porosity. The results show a bimodal porosity that can be customized by the sintering and the space holder. This study connects the processing parameters to the porosity created and allows control of porosity and pore size to produce tailor-made properties.

: http://publica.fraunhofer.de/dokumente/N-491348.html