A study of aluminium foam formation—kinetics and microstructure

Duarte, Isabel; Banhart, John

doi:10.1016/s1359-6454(00)00020-3

Cited by 276 publications

(197 citation statements)

References 2 publications

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“…8) Former phenomenon is currently associated with an additional stabilisation effect of oxide skin formed on surface of cell faces via the reaction of liquid Al with oxidizing CO 2 gas. 5,6,[8][9][10][11][12][13] Although the results related to in situ monitoring of foam formation from powder compacts being produced with TiH 2 foaming agent have been published, [14][15][16][17][18][19][20][21] formation of foams created from powder compacts with CaCO 3 as gas source has not yet been systematically assessed by in situ experiments. 22) The present paper is aimed at in situ analysis of foam formation and stability at heating Al-based powder compacts with CaCO 3 by comparison with those prepared with TiH 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of CaCO<sub>3</sub> Foaming Agent at Formation and Stabilization of Al-Based Foams Fabricated by Powder Compact Technique

2017

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The paper presents the results obtained by in situ observation of Al-based foams formation at heating of powder compacts with calcium carbonate (CaCO 3 ) by comparing with those prepared with conventional titanium hydride (TiH 2 ). Foamable precursors comprising powder of either pure aluminium or AlZnMg-alloy were used for detailed investigation of foam evolution and stability. High temperature X-ray furnace was applied for in situ visualization of foam formation. It was identi ed that expansion and stability of foams with CaCO 3 are much superior to those with TiH 2 . Distribution and size of solid inclusions (network of oxide remnants, particles of foaming agent, secondary reaction products, and solid oxide skin) in the cell wall materials of studied foams as well as relevant wetting data were determined to clarify the difference in foams stability. Improved stability of foams with CaCO 3 is explained on the base of stabilizing models developed by Kaptay by assuming an interfacial force, the disjoining pressure, which ef ciency is variable and dependent on the distribution and wetting behaviour of the clustered oxide network/solid particles in foamy melt.

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Section: Introductionmentioning

confidence: 99%

Effect of CaCO<sub>3</sub> Foaming Agent at Formation and Stabilization of Al-Based Foams Fabricated by Powder Compact Technique

2017

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“…Drainage is affected by the viscosity and the surface tension of liquid metal and causes cells to collapse, shape defects, and non-uniform distribution of solid metal. Melt viscosity is enhanced by adding second phase ceramic particles such as SiC, Al2O3, or MgO [9,[38][39][40][41][42][43][44].…”

Section: Aluminum Integral Foam Castingmentioning

confidence: 99%

New Approaches to Aluminum Integral Foam Production with Casting Methods

Güner

Arikan

Nebioğlu

2015

Metals

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Abstract:Integral foam has been used in the production of polymer materials for a long time. Metal integral foam casting systems are obtained by transferring and adapting polymer injection technology. Metal integral foam produced by casting has a solid skin at the surface and a foam core. Producing near-net shape reduces production expenses. Insurance companies nowadays want the automotive industry to use metallic foam parts because of their higher impact energy absorption properties. In this paper, manufacturing processes of aluminum integral foam with casting methods will be discussed.

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“…Thus, the acceleration in the releasing of hydrogen causes rapid coalescence of bubbles 21 . However, the volume expansion rates started to decrease again when these periods are exceeded the normal foaming duration and no more hydrogen gas is released and the foam begins to decay which leads to collapsing 22 . Figure 7 shows the samples foamed for 3.5 min after being deformed at various rates.…”

Section: Materials and Experimental Processmentioning

confidence: 99%

The effect of production parameters on the foaming behavior of spherical-shaped aluminum foam

Uzun

Türker

2014

Mat. Res.

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The effect of production parameters on the foaming behavior of spherical-shaped aluminum foam was studied. Elemental powders of Alumix 231 and 1% TiH 2 were mixed, compacted at 600 MPa pressure by using a uniaxial action press to produce blanks with 50×30×10 mm in dimensions. These blanks were pre-heated at 550 °C in a furnace for 180 min and then deformed by 10, 30, 50 and 70% by using an eccentric press. They were cut into square shape and foamed at temperatures between 650 °C and 710 °C. It was experimentally found that, the volume expansion rate of foam increases but the maximum foaming duration decreases with increasing the deformation rate and foaming temperature. In these studies 70% deformation and 3.5 minutes foaming duration were found to be the best for the production of spherical foams. This was determined by obtaining the maximum expansion, lower density and homogeneously distributed pores with spherical foams. It was also found that 10% deformation rate was not enough for foaming.

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A study of aluminium foam formation—kinetics and microstructure

Cited by 276 publications

References 2 publications

Effect of CaCO<sub>3</sub> Foaming Agent at Formation and Stabilization of Al-Based Foams Fabricated by Powder Compact Technique

Effect of CaCO<sub>3</sub> Foaming Agent at Formation and Stabilization of Al-Based Foams Fabricated by Powder Compact Technique

New Approaches to Aluminum Integral Foam Production with Casting Methods

The effect of production parameters on the foaming behavior of spherical-shaped aluminum foam

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