Effects of infiltration pressure on mechanical properties of Al–12Si/graphite composites for piston engines

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Title: Effects of infiltration pressure on mechanical properties of Al–12Si/graphite composites for piston engines
Authors: Narciso, Javier | Molina Jordá, José Miguel | Rodríguez Guerrero, Alejandro | Rodríguez Reinoso, Francisco | Louis, Enrique
Research Group/s: Materiales Avanzados | Física de la Materia Condensada
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Metal-matrix composites (MMCs) | Interphase | Mechanical testing | Liquid metal infiltration
Knowledge Area: Química Inorgánica | Física de la Materia Condensada
Issue Date: 15-Apr-2016
Publisher: Elsevier
Citation: Composites Part B: Engineering. 2016, 91: 441-447. doi:10.1016/j.compositesb.2016.01.022
Abstract: In this work results for the flexural strength and the thermal properties of interpenetrated graphite preforms infiltrated with Al-12wt%Si are discussed and compared to those for packed graphite particles. To make this comparison relevant, graphite particles of four sizes in the range 15–124 μm, were obtained by grinding the graphite preform. Effects of the pressure applied to infiltrate the liquid alloy on composite properties were investigated. In spite of the largely different reinforcement volume fractions (90% in volume in the preform and around 50% in particle compacts) most properties are similar. Only the Coefficient of Thermal Expansion is 50% smaller in the preform composites. Thermal conductivity of the preform composites (slightly below 100 W/m K), may be increased by reducing the graphite content, alloying, or increasing the infiltration pressure. The strength of particle composites follows Griffith criterion if the defect size is identified with the particle diameter. On the other hand, the composites strength remains increasing up to unusually high values of the infiltration pressure. This is consistent with the drainage curves measured in this work. Mg and Ti additions are those that produce the most significant improvements in performance. Although extensive development work remains to be done, it may be concluded that both mechanical and thermal properties make these materials suitable for the fabrication of piston engines.
Sponsor: The authors acknowledge financial support from the “Generalitat Valenciana” (PROMETEO II/2014/004-FEDER), University of Alicante (Project GRE08-P13) and Spanish Ministry of Science and Innovation (MAT2011-25029). J.M. Molina also acknowledges the Spanish Ministry of Education and Culture for a “Ramón y Cajal” contract.
URI: http://hdl.handle.net/10045/53437
ISSN: 1359-8368 (Print) | 1879-1069 (Online)
DOI: 10.1016/j.compositesb.2016.01.022
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.compositesb.2016.01.022
Appears in Collections:INV - LMA - Artículos de Revistas
INV - Física de la Materia Condensada - Artículos de Revistas

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