Pressure infiltration of Al–12 wt.% Si–X (X = Cu, Ti, Mg) alloys into graphite particle preforms

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Title: Pressure infiltration of Al–12 wt.% Si–X (X = Cu, Ti, Mg) alloys into graphite particle preforms
Authors: Rodríguez Guerrero, Alejandro | Sánchez, S.A. | Narciso, Javier | Louis, Enrique | Rodríguez Reinoso, Francisco
Research Group/s: Laboratorio de Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Física Aplicada
Keywords: Infiltration | Aluminium alloys | Graphite | Particulate reinforced composites
Knowledge Area: Química Inorgánica
Issue Date: Apr-2006
Publisher: Elsevier
Citation: RODRÍGUEZ GUERRERO, Alejandro, et al. "Pressure infiltration of Al–12 wt.% Si–X (X = Cu, Ti, Mg) alloys into graphite particle preforms". Acta Materialia. Vol. 54, Issue 7 (Apr. 2006). ISSN 1359-6454, pp. 1821-1831
Abstract: The pressure infiltration of Al and Al–12 wt.% Si–X alloys into preforms of packed graphite particles has been investigated. Compacts were prepared from particles of average diameter of 15, 27, 64, and 124 lm. While infiltration with pure Al at 750 °C was poor due to both gasification of graphite and reaction between C and Al, the lower infiltration temperature used for the Al–Si eutectic alloy improved infiltration performance. Results for the threshold pressure and infiltration kinetics are discussed in the light of previously published results. Ti (up to 1.5 wt.%) and Cu (up to 1.0 wt.%) additions were found to have no effect on pressure infiltration. However, Mg additions (up to 4 wt.%) significantly decreased the threshold pressure, as a consequence of the decrease in surface tension of Al promoted by this element. Coating the graphite particles with a chemical compound that dissolves the oxide layer reduces the threshold pressure, although this has limited technological applicability due to the increase in porosity. The compact permeability derived from infiltration of the alloys is compared with the intrinsic permeability obtained through infiltration of a wetting organic fluid.
Sponsor: This work was partially supported by Spanish MCYT (grants MAT2004-0529) and a European Community project (ALICE, contract GRD 2-2001-50048).
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2005.11.041
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - LMA - Artículos de Revistas
INV - Física de la Materia Condensada - Artículos de Revistas

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