Morphology of Aluminum Alloy Foams Produced with Dolomite via Partial Sintering of Precursors.

Author(s) Ramirez, A.Maria Medi; Vintila, R.Roxana; Drew, R.A.L.
Journal Materials (Basel)
Date Published 2019 May 24
Abstract

Highly expanded, low-cost aluminum-based foams were successfully produced via powder metallurgy using dolomite as foaming agent. Nickel additions (5-15 wt.%) were explored in order to reduce the temperature disparity between dolomite decomposition and the melting range of the metallic matrix. Specific Al-Ni compositions provide appropriate viscosities for effective encapsulation of CO gas released during dolomite decomposition. A partial sintering step of compacted precursors was introduced prior to foaming, which resulted in high porosity levels (~86%) and significant volume expansion (~250%) in the final product. The partial sintering technique was a key determining factor in obtaining stable, highly expanded cellular structures with homogeneous pores, averaging 3 mm in size and being morphologically comparable with ALPORAS foams.

DOI 10.3390/ma12101691
ISSN 1996-1944
Citation Ramirez AM, Vintila RR, Drew RA. Morphology of Aluminum Alloy Foams Produced with Dolomite via Partial Sintering of Precursors. Materials (Basel). 2019;12(10).

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