Carbonate-Foaming Agents in Aluminum Foams: Advantages and Perspectives

Soloki, Ali; Esmailian, Mohammad

doi:10.1007/s11663-014-0262-1

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…Pore walls exhibit higher amount of oxygen (O) and magnesium (Mg). This migration is consistent with the findings with the case of carbonate based foaming agents, wherein the oxides produced on decomposition provide stabiltiy to the melt [27,30]. In the present case, the MgO produced on decomposition of MgCO 3 tends to preferentially sit along the periphery of the pores, thickening the melt without the need for additional stabilizing agent.…”

Section: Foamed Samplesupporting

confidence: 91%

“…In spite being a popular foaming agent, high cost and the risk explosion are some issues associated with the use of TiH 2 [26]. Apart from hydrides, carbonates are now being considered as substitute foaming agents for aluminum [26][27][28]. The pore structure of carbonate based foams is quite different from titanium hydride, wherein the latter comprises of larger pores as compared to carbonate based foams [29,30].…”

Section: Introductionmentioning

confidence: 99%

“…The pore structure of carbonate based foams is quite different from titanium hydride, wherein the latter comprises of larger pores as compared to carbonate based foams [29,30]. In the case of titanium hydride (TiH 2 ), the hydrogen gas (H 2 ) released on decomposition does not provide a stabilizing action to the melt [27]. Further, titanium forms brittle intermetallic compounds with the aluminum melt [29], leading to brittle fracture of the foams.…”

Section: Introductionmentioning

confidence: 99%

“…Further, titanium forms brittle intermetallic compounds with the aluminum melt [29], leading to brittle fracture of the foams. While in the case of carbonate based foaming agents, the oxides formed on decomposition [3], help in stabilization of the pores, and the released CO 2 reacts with the melt to make the melt viscous, while at the same increasing the volume of the nucleated pores [27,30].…”

Section: Introductionmentioning

confidence: 99%

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Foaming of friction stir processed Al/MgCO₃ precursor via flame heating

Shandley

Maheshwari

Siddiquee

et al. 2020

Mater. Res. Express

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In the recent years, metal foams have become promising candidate materials in the engineering sector owing to their light weight and excellent energy absorption properties. Friction stir processing (FSP) has emerged as a cost-effective route to fabricate metal foam precursors from bulk substrates. Although the short processing time in FSP is able to provide high productivity, the cost of the foaming agent, TiH 2 in the case of aluminum foams is still high. This paper introduces flame heating to achieve localized foaming of aluminum alloy AA5754 to explore the possibility of using magnesium carbonate as a foaming agent stirred using multi-pass FSP. A specially designed slot based strategy using two plates arranged in lap configuration is devised to stir the foaming agent and understand the material movement after each subsequent pass. Microscopy techniques were carried out to evaluate the distribution of the foaming agent after each pass and the resulting microstructure of the processed plates as well as the morphology of the foamed sample. EDX results showed higher Mg and O content around the pore walls.

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Section: Foamed Samplesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Foaming of friction stir processed Al/MgCO₃ precursor via flame heating

Shandley

Maheshwari

Siddiquee

et al. 2020

Mater. Res. Express

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“…[1][2][3][4][5][6] These excellent properties allow aluminum foams to be used in many application fields. [7][8][9] Among various manufacturing methods, melt foaming method is one of the most widely used one. [8] It has a simple procedure and is easy to fabricate large foam blocks, which makes it the most promising method for commercial production of aluminum foams.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Aluminum Foams with Small Pore Size by Melt Foaming Method

Cheng

Chen

et al. 2017

Metall Mater Trans B

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This article introduces an improvement to the fabrication of aluminum foams with small pore size by melt foaming method. Before added to the melt, the foaming agent (titanium hydride) was pretreated in two steps. It firstly went through the traditional pre-oxidation treatment, which delayed the decomposition of titanium hydride and made sure the dispersion stage was controllable. Then such pre-oxidized titanium hydride powder was mixed with copper powder in a planetary ball mill. This treatment can not only increase the number of foaming agent particles and make them easier to disperse in the melt, which helps to increase the number of pores, but also reduce the amount of hydrogen released in the foaming stage. Therefore, the pore size could be decreased. Using such a ball-milled foaming agent in melt foaming method, aluminum foams with small pore size (average size of 1.6 mm) were successfully fabricated.

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