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 experimental… Show more
“…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 ].…”
Section: Fabrication Techniques Of Metal Foamsmentioning
Metal foams possess remarkable properties, such as lightweight, high compressive strength, lower specific weight, high stiffness, and high energy absorption. These properties make them highly desirable for many engineering applications, including lightweight materials, energy-absorption devices for aerospace and automotive industries, etc. For such potential applications, it is essential to understand the mechanical behaviour of these foams. Producing metal foams is a highly challenging task due to the coexistence of solid, liquid, and gaseous phases at different temperatures. Although numerous techniques are available for producing metal foams, fabricating foamed metal still suffers from imperfections and inconsistencies. Thus, a good understanding of various processing techniques and properties of the resulting foams is essential to improve the foam quality. This review discussed the types of metal foams available in the market and their properties, providing an overview of the production techniques involved and the contribution of metal foams to various applications. This review also discussed the challenges in foam fabrications and proposed several solutions to address these problems.
“…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 ].…”
Section: Fabrication Techniques Of Metal Foamsmentioning
Metal foams possess remarkable properties, such as lightweight, high compressive strength, lower specific weight, high stiffness, and high energy absorption. These properties make them highly desirable for many engineering applications, including lightweight materials, energy-absorption devices for aerospace and automotive industries, etc. For such potential applications, it is essential to understand the mechanical behaviour of these foams. Producing metal foams is a highly challenging task due to the coexistence of solid, liquid, and gaseous phases at different temperatures. Although numerous techniques are available for producing metal foams, fabricating foamed metal still suffers from imperfections and inconsistencies. Thus, a good understanding of various processing techniques and properties of the resulting foams is essential to improve the foam quality. This review discussed the types of metal foams available in the market and their properties, providing an overview of the production techniques involved and the contribution of metal foams to various applications. This review also discussed the challenges in foam fabrications and proposed several solutions to address these problems.
“…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].…”
Herein, a powder compacting method was developed to fabricate high porosity micro-and macrocellular copper foams using CaCO 3 space holder. The cold compacted precursors were heated at different temperatures under the nitrogen atmosphere. The effects of precursor compaction pressure, space holder content and sintering temperature on cell microstructure, relative density, compressive and physical properties were investigated. The scanning electron microscopy (SEM) images showed a uniform distribution of interconnected pores with sizes of pores and channels less than 50 microns formed the semi-open cell structure of the fabricated foams. The evaluation of the foaming agent content, 0 to 20 (wt%), in precursor materials showed relatively large changes in the porosity percentage (27%-50%), with the utilitarian strength (43 MPa) and densification strain (40%) of the copper foams. For specimens having 20 wt% CaCO 3 , tuning the sintering temperature (600°C) and compacting pressure (500 MPa) of precursors tailored superior porosity percent (47%), remarkable compressive stress (501 MPa) and high thermal (43.8 W m −1 .k), and electrical conductivity (0.06×10 8 Ω −1 m −1 ) owing to a desirable foaming process. A massive gas release during the CaCO 3 decomposition and the strengthened cell walls of the copper foams during the sintering resulted in the high porosity and strength of the fabricated foams. The presented fabrication method and our results are the core elements for the development of new high porosity metal foams that can help the development of the future application of copper foams for a long-life anode for lithium-ion batteries, catalysis, and thermal and electrical performances as electronic cooling materials.
“…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).…”
En el presente trabajo se estudia el comportamiento mecánico de las espumas de aluminio mediante la realización de pruebas estáticas y dinámicas de compresión. Una vez que se haya analizado su comportamiento, se debe poder decidir si este material es el adecuado para diferentes tipos de aplicaciones. Se comienza empleando piezas esferoidales de aleación de aluminio AlSi7, espumadas con mármol como agente de soplado, situadas entre dos placas de aluminio fijadas a las bolas con una mezcla formada por resina y un endurecedor. Por otro lado, se preparan otros paneles sándwiches con espumas de aluminio convencionales, adheridos con la misma mezcla a dos placas de aluminio. Estos dos tipos de materiales serán caracterizados mecánicamente.
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