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

Abstract

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.

Microstructure and Mechanical Properties of Metal Foams Fabricated via Melt Foaming and Powder Metallurgy Technique: A Review

“…Some of the common foaming agents and injection gases include TiH 2 [ 101 , 102 , 103 , 104 , 105 ], CaCO 3 [ 106 , 107 ], zirconium hydride [ 108 , 109 ], dolomite (CaMg(CO 3 ) 2 ) [ 110 , 111 ], etc. The stabilising particles such as Ca, ZrB 2 , CaO, Al 2 O 3 , etc., are also added into the melt [ 83 , 112 ].…”

High porosity micro- and macro-cellular copper foams with semi-open cell microstructure toward its physical and mechanical properties

“…Metal foams have recently attracted much attention in various fields of academia and industry [1][2][3][4]. These novel engineering materials have unique combinations of properties such as lightweight, energy absorption, thermal management, sound absorption and electromagnetic shielding [4,5].…”

Análisis estático y dinámico de estructuras sándwich con núcleo monocapa de esferoides APM espumados in-situ con mármol

“…The synthesis process (Fernández et al, 2008;Fernández et al, 2009) is based on the compaction of a mixture of powders, AlSi alloy, and subsequent extrusion of AlSi7 metal alloys with TiH2 as foaming agent. Literature available has proven that other foaming agents such as ZrH2, dolomite and CaCO 3 are equally effective (Uzun and Turker, 2014). The foamable precursors are cut in small granules and introduced in a heated oven for foaming (Vesenjak et al, 2013;Ulbin et al, 2014).…”