Aluminum foam stabilization by solid particles

Ip, S. W.; Wang, S.W.; Toguri, J. M.

doi:10.1016/s0008-4433(98)00024-x

Cited by 76 publications

(16 citation statements)

References 12 publications

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“…Direct foaming methods of metal melts produce irregular cell structures and inhomogeneous cell sizes, so it is necessary to increase the viscosity of metal melts in order to prevent gas bubble from escaping and coalescing. Additions of ceramic particles such as SiC, MnO 2 and Al 2 O 3 to metal melts, is a good approach for increasing viscosity and stabilizing the cell wall [2][3][4]. It should be noted that the effect of the these added particles is reported primary in the context of stabilization of the foam through the wetting process and particle interaction phenomena such as the development of capillary and interfacial forces and secondly as a mechanism of drainage retardation [5,6].…”

Section: Introductionmentioning

confidence: 99%

The use of dolomite as foaming agent and its effect on the microstructure of aluminium metal foams—Comparison to titanium hydride

Papadopoulos

Omar

Stergioudi

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Abstract:In this paper dolomite MgCa(CO 3 ) 2 a naturally occurring mineral was demonstrated to be an effective foaming and stabilizing agent for aluminium with several notable advantages relative to the currently used titanium hydride foaming agent. Characteristic cell structures and microstructural features of foams produced with a dolomite foaming agent are examined and the properties of dolomite based foams produced in a one step process are compared with those produced using titanium hydride based process. The most notable structural feature of dolomite based foams is a smaller cell size and thinner cell faces. Foaming with MgCa(CO 3 ) 2 also gives rise to a marked increase in the stability of molten foams with a large range of foaming temperatures possible, and an almost complete absence of melt drainage even with extended foaming times. Many of these properties are attributed to the cell surfaces being covered by a thin oxide film formed during the foaming process.

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Section: Introductionmentioning

confidence: 99%

The use of dolomite as foaming agent and its effect on the microstructure of aluminium metal foams—Comparison to titanium hydride

Papadopoulos

Omar

Stergioudi

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The effect of oxide layer on foam stabilization has been reported from other researchers [3][4][5]. On the other hand, foam by TiH 2 are stabilized by solid particles, like SiO 2 [6].…”

Section: Introductionmentioning

confidence: 62%

Method of Preventing Shrinkage of Aluminum Foam Using Carbonates

Koizumi

Kido

Kita

et al. 2011

Metals

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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. OPEN ACCESSMetals 2012, 2 2

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“…The ceramic particles trap gas bubbles owing to the favorable interface energy and serve as stabilizer of the cell walls and delay their coalescence. They also reduce the velocity of the rising bubbles by increasing the viscosity of the melt (Ip et al, 1999;Kaptay, 2003;Hur et al, 2003). Therefore, the first step requires the preparation of a melt bath containing these substances.…”

Section: Manufacturing Methodsmentioning

confidence: 99%

“…Moreover, in order to improve the stability of metal foams, usually ceramic particles were added. Literature data report that ceramic particles inhibit melt flow, after increasing the viscosity, thus decreasing the rate of cell coarsening and drainage of liquid through the structures (Ip et al, 1999). The tested amount of SiC was in the range of 0-10 wt%.…”

Section: Tih 2 Processmentioning

confidence: 99%