Aluminum integral foam castings with microcellular cores by nano-functionalization

Hartmann J, Blümel C, Ernst S, Fiegl T, Wirth KE, Körner C (2014)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2014


Book Volume: 49

Pages Range: 79-87

Journal Issue: 1

DOI: 10.1007/s10853-013-7668-z


The goal of the present work is the refinement of the pore morphology of aluminum integral foam castings. Integral foam molding, a modified high pressure die casting process, is used where a mixture of melt and blowing agent particles (magnesium hydride, MgH) is injected at high velocity into a permanent steel mold. At the mold surface, decomposition of the blowing agent and pore formation is suppressed due to the high solidification rate whereas solidification of the core is much slower allowing blowing agent decomposition, pore nucleation, and growth. Blowing agent particles not only act as gas suppliers but also represent pore nuclei. Thus, microcellular foam cores can be attained by increasing the number of MgH particles. But increasing the number of powder particles by powder milling strongly decreases the flowability and strong particle agglomeration as a result of the increasing cohesive forces leads to inhomogeneous foams. Flowability of the powder can be restored by coating it with SiO-nano-particles resulting in a homogeneous microcellular foam morphology. © 2013 Springer Science+Business Media New York.

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Hartmann, J., Blümel, C., Ernst, S., Fiegl, T., Wirth, K.-E., & Körner, C. (2014). Aluminum integral foam castings with microcellular cores by nano-functionalization. Journal of Materials Science, 49(1), 79-87.


Hartmann, Johannes, et al. "Aluminum integral foam castings with microcellular cores by nano-functionalization." Journal of Materials Science 49.1 (2014): 79-87.

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