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Metals 2012, 2(1), 1-9;

Method of Preventing Shrinkage of Aluminum Foam Using Carbonates

Machinery and Engineering Group, YKK Corporation, Yoshida Kurobe City, Toyama 938-8601, Japan
Fastening Products Group, YKK Corporation, Yoshida Kurobe City, Toyama 938-8601, Japan
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
Physical-Technological Institute of Metals and Alloys, The National Academy of Sciences of Ukraine, Kiev 04004, Ukraine
Author to whom correspondence should be addressed.
Received: 23 September 2011 / Revised: 7 December 2011 / Accepted: 15 December 2011 / Published: 23 December 2011
(This article belongs to the Special Issue Metal Foams)
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Metallic foams are commonly produced using titanium hydride as a foaming agent. Carbonates produce aluminum foam with a fine and homogenous cell structure. However, foams produced using carbonates show marked shrinkage, which is clearly different from those produced using titanium hydride. It is essential for practical applications to clarify foam shrinkage and establish a method of preventing it. In this research, cell structures were observed to study the shrinkage of aluminum foam produced using carbonates. The cells of foam produced using dolomite as a foaming agent connected to each other with maximum expansion. It was estimated that foaming gas was released through connected cells to the outside. It was assumed that cell formation at different sites is effective in preventing shrinkage induced by cell connection. The multiple additions of dolomite and magnesium carbonate, which have different decomposition temperatures, were applied. The foam in the case with multiple additions maintained a density of 0.66 up to 973 K, at which the foam produced using dolomite shrank. It was verified that the multiple additions of carbonates are effective in preventing shrinkage. View Full-Text
Keywords: aluminum foam; carbonates; shrinkage aluminum foam; carbonates; shrinkage

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Koizumi, T.; Kido, K.; Kita, K.; Mikado, K.; Gnyloskurenko, S.; Nakamura, T. Method of Preventing Shrinkage of Aluminum Foam Using Carbonates. Metals 2012, 2, 1-9.

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