Effects of Fe addition on the mechanical and thermo-mechanical properties of SiC/FeSi2/Si composites produced via reactive infiltration

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Title: Effects of Fe addition on the mechanical and thermo-mechanical properties of SiC/FeSi2/Si composites produced via reactive infiltration
Authors: Camarano, Antonio | Caccia, Mario | Molina Jordá, José Miguel | Narciso, Javier
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: SiC | Composites | CTE | Bending strength | Fe–Si
Knowledge Area: Química Inorgánica
Issue Date: Jul-2016
Publisher: Elsevier
Citation: Ceramics International. 2016, 42(9): 10726-10733. doi:10.1016/j.ceramint.2016.03.196
Abstract: Remaining silicon in SiC-based materials produced via reactive infiltration limits their use in high-temperature applications due to the poor mechanical properties of silicon: low fracture toughness, extreme fragility and creep phenomena above 1000 °C. In this paper SiC–FeSi2 composites are fabricated by reactive infiltration of Si–Fe alloys into porous Cf/C preforms. The resulting materials are SiC/FeSi2 composites, in which remaining silicon is reduced by formation of FeSi2. For the richest Fe alloys (35 wt% Fe) a nominal residual silicon content below 1% has been observed. However this, the relatively poor mechanical properties (bending strength) measured for those resulting materials can be explained by the thermal mismatch of FeSi2 and SiC, which weakens the interface and does even generate new porosity, associated with a debonding phenomenon between the two phases.
Sponsor: Authors would like acknowledge the financial support received from the Generalitat Valenciana (PROMETEO II/2014/004-FEDER, PhD grant Vali+d and Santiago Grisolia program, GRISOLIA/2013/023), and the European Union's Seventh Framework Programme (FP7/2007-2013) under the HELM project, Grant agreement no. 280464 are gratefully acknowledged.
URI: http://hdl.handle.net/10045/56035
ISSN: 0272-8842 (Print) | 1873-3956 (Online)
DOI: 10.1016/j.ceramint.2016.03.196
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd and Techna Group S.r.l.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.ceramint.2016.03.196
Appears in Collections:INV - LMA - Artículos de Revistas
Research funded by the EU

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