Aluminum Foam Stabilization by Solid Particles

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

doi:10.1179/cmq.1999.38.1.81

Cited by 145 publications

(112 citation statements)

References 10 publications

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“…In the composite foam, the particles tended to segregate at the liquid/gas interface and were present inside the cell wall (Fig. 6a), similar to the SiC p /Al foams produced by Alcan and Formgrip processes [13,18,23,24]. This was attributed to the partial wetting of the SiC particles by liquid Al metal [18].…”

Section: Materials and Experimental Methodsmentioning

confidence: 71%

SiC-particulate aluminum composite foams produced from powder compacts: foaming and compression behavior

Güden

Yüksel

2006

J Mater Sci

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The foaming behavior of SiC-particulate (SiC p ) aluminum composite powder compacts containing titanium hydride blowing agent was investigated by heating to 750• C in a pre-heated furnace. Aluminum powder compacts were also prepared and foamed using similar compaction and foaming parameters in order to determine the effect of SiC p -addition on the foaming and compression behavior. The SiC p -addition (10 wt%) was found to increase the linear expansion of the Al powder compacts presumably by increasing the surface as well as the bulk viscosities. The compression tests conducted on Al and 10 and 20% SiC p foams further showed a more brittle compression behavior of SiC p /Al foams as compared with Al foams. The collapse stresses of Al and 10% SiC p /Al foams were also predicted using the equations

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Section: Materials and Experimental Methodsmentioning

confidence: 71%

SiC-particulate aluminum composite foams produced from powder compacts: foaming and compression behavior

Güden

Yüksel

2006

J Mater Sci

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“…31,32 On the other hand, an enhancement of the melt viscosity was supposed to have a positive effect on foam stability. 31,[33][34][35] This suspected effect was used by various foam production routes such as Cymat 33 by admixing ceramic particles to a melt, or Alporas 34 by adding Ca metal and producing CaO for melt thickening. 31,35 Nevertheless it is still not completely understood whether the admixed solid particles act due to their adherence to the melt/gas interface, or by increasing the apparent viscosity.…”

Section: Correlation Of Rupture Rate and Temperaturementioning

confidence: 99%

“…31,[33][34][35] This suspected effect was used by various foam production routes such as Cymat 33 by admixing ceramic particles to a melt, or Alporas 34 by adding Ca metal and producing CaO for melt thickening. 31,35 Nevertheless it is still not completely understood whether the admixed solid particles act due to their adherence to the melt/gas interface, or by increasing the apparent viscosity. 36,37 Further investigations on PM foams, where solid oxides from the metal powders are responsible for stabilization, 17 have shown that the cell wall rupture time is in the order of milliseconds or less, thus not dominated by viscosity.…”

Section: Correlation Of Rupture Rate and Temperaturementioning

confidence: 99%

Kinetics of coalescence in liquid aluminium foams

2011

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The cell wall rupture kinetics for a collection of AlSi9 foam samples kept at a constant temperature over the melting point for a long time period (700 s) has been characterized by in situ X-ray radioscopy. The images obtained have been computed by using image analysis algorithms allowing the identification of the cell wall ruptures in the molten state. The time evolution, the spatial distribution and the number of cell wall rupture events are studied in this work. The cell wall rupture rate was determined for the first time in liquid aluminium foams. Part of the results obtained has been explained in terms of the spatial distribution of temperature obtained by different heating configurations and measured by thermographic techniques. The progressive coarsening and density redistribution of the cellular structure and the drainage due to gravity have been also considered. The local temperature seems to be critical for the rupture phenomena and the temperature distribution clearly affects the foam density distribution.

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“…8 Their stability was shown to depend crucially on the presence of dispersed solid particles and of oxygen in the surrounding atmospheres, on the size of the lms and on the velocity of lm pulling, which is in accordance with real metal foams. [9][10][11] These ndings regarding stabilisation in a simplied model system were found to be useful to understand the stability of real metallic foams.…”

Section: Introductionmentioning

confidence: 99%

The rupture of a single liquid aluminium alloy film

et al. 2014

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The present study is based on the idea of understanding the rupture of films in metal foams by studying free standing metallic films as a model system. Liquid dynamics, the velocity of the rupturing material as well as the behaviour of ceramic particles inside the melt were analysed optically ex situ and by synchrotron X-ray radiography in situ. It was found that the resistance of films to rupture is mainly based on the interaction between solid particles and an immobile oxide skin, the formation of which depends on the oxygen content of the surrounding atmosphere and the presence of magnesium.

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Aluminum Foam Stabilization by Solid Particles

Cited by 145 publications

References 10 publications

SiC-particulate aluminum composite foams produced from powder compacts: foaming and compression behavior

SiC-particulate aluminum composite foams produced from powder compacts: foaming and compression behavior

Kinetics of coalescence in liquid aluminium foams

The rupture of a single liquid aluminium alloy film

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