2004
DOI: 10.1002/adem.200405144
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The Role of Oxidation in Blowing Particle‐Stabilised Aluminium Foams

Abstract: Metal foams were produced by blowing gas into aluminium alloy melts. The effect of oxygen content of the blowing gas on composition and structure of the inner surface of the foam cells is studied by varying gas composition from argon, nitrogen and air to pure oxygen. Scanning Electron Microscopy, Auger Electron Spectroscopy and Transmission Electron Microscopy are used to analyse the surfaces. Initially particle‐free melts are pre‐treated by bubbling air through them after which a certain degree of foam stabil… Show more

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Cited by 85 publications
(36 citation statements)
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“…As a rule, internal gas formation makes it easier to create a stable foam than external gas injection. [17] …”
Section: Direct Foaming Of Meltsmentioning
confidence: 99%
“…As a rule, internal gas formation makes it easier to create a stable foam than external gas injection. [17] …”
Section: Direct Foaming Of Meltsmentioning
confidence: 99%
“…Generally, the formation of oxide layer is considered to be primary responsible both for ef cient inhibition of cell coalescence 4,12) and retention of ne cell structure. 6,8) The ways proposed to explain the role of oxide layer on cell face surface in terms of its effect on foam stability were summarised.…”
Section: Stabilizing Effect Of Clustered Oxide Network/parti-mentioning
confidence: 99%
“…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%
“…Stabilization of bubbles is due to segregation of particles to the bubble surfaces. If aluminum melt does not contain micrometer-sized particles, such particles can be created in-situ by bubbling air through the melt [8]. Foam stability can be increased by using Al2O3 instead of SiC, because of increased cell wall thickness.…”
Section: Introductionmentioning
confidence: 99%
“…Method Blowing oxygen melt AlSi7Fe1 solves these two problems at same time. Modification of aluminum alloys by introducing Al2O3 particles also was described for metal foam and metal matrix composites [6][7][8][9][10][11][12]. Formation of oxide shell even under argon cannot be avoided due to residual oxygen traces in gas.…”
Section: Introductionmentioning
confidence: 99%