Production of aluminum foam by spherical carbamide space holder technique-processing parameters

Bafti, Hasan; Habibolahzadeh, Ali

doi:10.1016/j.matdes.2010.04.038

Cited by 113 publications

(45 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For organic space holder, carbamide particle size was 2.04mm. Differential Thermal Analysis was carried out on carbamide and revealed its melting temperature was at 132°C, which about similar result found with previous researcher [5]. For sample preparation, aluminium powder was firstly mixed with carbamide in a planetary ball mill (Fritsch Planetary Mono Mill Pulverisette) for two hours (100 RPM).…”

Section: Methodssupporting

confidence: 80%

Effect of Organic Space Holder in Fabrication of Cloced-Cell Aluminium Foam

Idris

Ehsan

Mohamed

2013

KEM

View full text Add to dashboard Cite

:. In this work, the closed-cell aluminium foams were fabricated via powder metallurgy route with organic space holder which also known as carbamide (urea). Carbamide was added with aluminium powder at different compositions from 50wt% to 70wt%. Then the influences of sintering temperatures were also investigated at 500°C, 550°C and 600°C. Physical and mechanical tests were conducted on the fabricated closed cell aluminium foam samples. The result showed that the porosity inversely proportional with density, that means the porosity decreases as the density of the foam increased. Also, it was revealed that the highest compressive strength was obtained at sintering temperature of 550°C. However, the compressive strength of the closed-cell aluminium foam decreased at the sintering temperature of 600°C. This is due to the occurrence of oxidation problem. It can be concluded that carbamide can be proposed as one of the organic space holder material in the fabrication of closed-cell aluminium foam. Then, the experimental parameters such as sintering temperature, type of space holder and composition gave great influence to the mechanical and physical properties of the fabricated closed-cell aluminium foam.

show abstract

Section: Methodssupporting

confidence: 80%

Effect of Organic Space Holder in Fabrication of Cloced-Cell Aluminium Foam

Idris

Ehsan

Mohamed

2013

KEM

View full text Add to dashboard Cite

show abstract

“…The densities increase slightly with increasing compaction pressure and with decreasing salt mass ratio (Fig. 6) [10]. For both routes, the porous structures obtained with very low quantities of aluminium alloy (90.90 and 86.20 wt% NaCl) compacted at lower pressures, resulting densities below 0.29 g/cm 2 after NaCl dissolution, are very weak and are easily broken when handled.…”

Section: Porous Structuresmentioning

confidence: 93%

“…Giliani et al [6] have showed that failure to achieve appropriate mixing of the two constituents led to NaCl entrapment and local collapse of the metallic network. Bafti and Habibolahzadeh [10] have showed that entrapment of the porogen can also lead to the sample crack during sintering process.…”

Section: Introductionmentioning

confidence: 99%

Production Process and Properties of a Highly Porous Al Alloy Made Using NaCl Droplets as a Space Holder

Covaciu

Kennedy

2015

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

Porous Al structures have been made using a porogen leaching method but with additional novel steps. In this way, Al-0.25Cu-0.6Si-1.0Mg alloys with interconnected, open cells have been made, with high levels of porosity (up to 89%). The use of 4 to 5 mm diameter sodium chloride droplets combined with interspersion of the metal powder and droplets in the die and dissolution of the salt before sintering was found to enable easier interspersion of the two components, resulting in good connectivity of the beads via the formation of ''windows'' between the pores, and rapid elimination of salt from the structure. Porous Al with densities in the range of 0.28-0.86 g/cm 3 exhibited compressive yield strengths in the range of 0.14 to 7.5 MPa, with no difference being observed between the samples made by this route and by more conventional dissolution of the salt after sintering. These novel steps widen the possibility for porous metal manufacture to other materials, not limited by the need to have a sintering temperature below that for the melting point of salt.

show abstract

“…It is well known that direct gas foaming, powder metallurgy and casting technique are commonly used to fabricate Al foams [2]. Previous work of our group [3] and other researchers [4,5] have shown that the space-holder method, belonging to the powder metallurgy technique, could be applied to well control pore structures; the carbamide used as space-holder materials could be easily eliminated without corrosion of metal matrix. In recent years, the composite foams reinforced by ceramic reinforcements like Al 2 O 3 [6], SiC [7] have been increasingly reported, and these foam materials possess the strengthened cell wall and the enhanced energy absorption capacity.…”

Section: Introductionmentioning

confidence: 99%