The effects of viscosity and cooling conditions on the foamability of aluminum alloy

Yang, C.C; Nakae, Hideo

doi:10.1016/s0924-0136(02)01048-8

Cited by 85 publications

(47 citation statements)

References 7 publications

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“…On the other hand, in the foaming method that utilizes a liquid state, an injection gas or a gas-releasing foaming agent is used to foam a liquid metal. Aluminum foam, which is one of the most well known foamed metals, [8][9][10][11][12][13][14][15] is manufactured by two methods. One of the methods is direct foaming.…”

Section: Introductionmentioning

confidence: 99%

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Development of a New Method for Manufacturing Iron Foam Using Gases Generated by Reduction of Iron Oxide

et al. 2007

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A new method for manufacturing iron foam using CO and CO 2 as foaming gases was studied. This method consists of three stages: (1) mixing powders of pure iron, graphite, and hematite; (2) preparing the precursor by cold pressing the mixed powders; and (3) foaming by heating the precursor at temperatures between the liquidus and solidus in the Fe-C binary system. Molten iron containing carbon is foamed by gases generated by a reduction reaction. Optimizations of both the composition of the precursor and the heating conditions are required to produce the iron foam with high porosity. It was found that the content and powder size of hematite in the precursor significantly affect the porosity and pore diameter of the iron foam. Iron foam with a porosity of 55% and average pore diameter of around 500 mm is obtained by heating the precursor of Fe-3.1 mass%C-1.0 mass%Fe 2 O 3 at 1543 K.

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Section: Introductionmentioning

confidence: 99%

“…One of the methods is direct foaming. [8][9][10][11][12][13] In this method, a small amount of calcium is added into molten aluminum to increase the viscosity, and molten aluminum is poured into a casting mold. Subsequently, it is stirred together with a foaming agent such as TiH 2 ; foaming then occurs in molten aluminum.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Method for Manufacturing Iron Foam Using Gases Generated by Reduction of Iron Oxide

et al. 2007

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“…The same gas sources are used to obtain cell structures in different casting systems as in other foam production systems: gas agents (e.g., TiH2, MgH2, CaCO3, or CaMg(CO3)2), precursors, gas pressure chambers, or blowing gas into the melt with a nozzle [9,25,35,36]. The foamability of aluminum alloys depends on viscosity and cooling conditions [37]. The drainage period of liquid through the cell walls starts after the period of gas production.…”

Section: Aluminum Integral Foam Castingmentioning

confidence: 99%

New Approaches to Aluminum Integral Foam Production with Casting Methods

Güner

Arikan

Nebioğlu

2015

Metals

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Abstract:Integral foam has been used in the production of polymer materials for a long time. Metal integral foam casting systems are obtained by transferring and adapting polymer injection technology. Metal integral foam produced by casting has a solid skin at the surface and a foam core. Producing near-net shape reduces production expenses. Insurance companies nowadays want the automotive industry to use metallic foam parts because of their higher impact energy absorption properties. In this paper, manufacturing processes of aluminum integral foam with casting methods will be discussed.

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“…Utilizando este método de espumación, Yang concluyó que la viscosidad y la solidificación del fundido, controladas apropiadamente, promueven una buena uniformidad de la estructura porosa (tamaño de poro y el volumen de porosidad total) de las espumas de aluminio. Establece, entonces, que la existencia de partículas de alúmina tiene una fuerte influencia en el incremento de la viscosidad del fundido y en la nucleación de las burbujas, cuyo crecimiento es proporcional al tiempo de solidificación [55] . De otro lado, con el fin de generar una espuma de poros más finos y con estructuras de celda más uniformes, se ha recurrido a la deformación mecánica del precursor espumable, lo cual acelera el proceso de espumación [56] .…”

Section: Espumación De Lingotes Con Agente Espumanteunclassified

Manufacturing processes of cellular metals. Part I: Liquid route processes

2008

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P Pr ro oc ce es so os s d de e f fa ab br ri ic ca ac ci ió ón n d de e m me et ta al le es s c ce el lu ul la ar re es s. . P Pa ar rt te e I I: : P Pr ro oc ce es so os s p po or r v ví ía a l lí íq qu ui id da a ( (• •) ) P. Fernández * , L. J. Cruz * y J. Coleto ** R Re es su um me en n Los metales celulares, con sus interesantes y particulares características, constituyen parte de la gran familia de los nuevos materiales. Ellos pueden ser de porosidad abierta o cerrada. En la actualidad, el gran reto para los investigadores en materiales se fundamenta, aún, en el perfeccionamiento de las técnicas de fabricación que permitan obtener metales celulares reproducibles, confiables y de calidad. Por tal motivo, en el presente trabajo, se revisan los diferentes métodos de producción por vía líquida, haciendo una breve descripción de los principales parámetros involucrados y las ventajas y desventajas de cada uno de ellos. P Pa al la ab br ra as s c cl la av ve e Metales celulares; Espumas metálicas; Esponjas metálicas; Fundición.M Ma an nu uf fa ac ct tu ur ri in ng g p pr ro oc ce es ss se es s o of f c ce el ll lu ul la ar r m me et ta al ls s. . P Pa ar rt t I I: : L Li iq qu ui id d r ro ou ut te e p pr ro oc ce es ss se es s A Ab bs st tr ra ac ct tWith its interesting and particular characteristics, cellular metals are taking part of the great family of new materials.They can have open or closed porosity. At the present time, the major challenge for the materials researchers is based in the manufacturing techniques improvement in order to obtain reproducible and reliable cellular metals with quality. In the present paper, the different production methods to manufacture cellular metals by liquid route are reviewed; making a short description about the main parameters involved and the advantages and drawbacks in each of them. Los metales celulares (MC) son materiales obtenidos a partir de un metal puro o de una aleación, que bien pueden formar una estructura de poros abiertos (esponjas metálicas) o una de poros cerrados (espumas metálicas). Dicha estructura porosa hace que los MC sean materiales muy especiales, innovadores y con prometedoras perspectivas de aplicaciones futuras ya que, además de contar con una muy baja densidad, poseen propiedades físico-químicas, mecánicas y estructurales propias del metal del que están formados y otras derivadas de la estructura porosa [1][2][3][4] . En este sentido, los MC han sido reconocidos como materiales "multifuncionales", debido a que cubren una serie de características necesarias en diferentes aplicaciones, las cuales varían mucho según el proceso de producción empleado [5 y 6] . Como ratificación de lo anterior es posible, entonces, observar como las esponjas metálicas son utilizadas como materiales funcionales (absorción de ruido y vibraciones, intercambiadores de calor y superficie para catálisis), y las espumas metálicas se usan en aplicaciones de tipo estructural (absorción de energía de impacto, aligeramiento de estructuras) [1][2][3][4][5][6][7] .Aunque desd...

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The effects of viscosity and cooling conditions on the foamability of aluminum alloy

Cited by 85 publications

References 7 publications

Development of a New Method for Manufacturing Iron Foam Using Gases Generated by Reduction of Iron Oxide

Development of a New Method for Manufacturing Iron Foam Using Gases Generated by Reduction of Iron Oxide

New Approaches to Aluminum Integral Foam Production with Casting Methods

Manufacturing processes of cellular metals. Part I: Liquid route processes

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