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SiC porous structures obtained with innovative shaping technologies
File(s)
Author(s)
Ferraro, Claudio
Garcia-Tunon, Esther
Barg, Suelen
Miranda, Miriam
Ni, Na
Type
Journal Article
Abstract
SiC structures with porosities ranging between 20–60% have been fabricated using two methods emulsification and freeze casting. While emulsification results in foam-like isotropic materials with interconnected pores, freeze casting can be used to fabricate highly anisotropic materials with characteristic layered architectures. The parameters that control the pore size and final porosity have been identified (solid content in the initial suspensions, emulsification times or speed of the freezing front). We have found that liquid state sintering (suing Al2O3 and Y2O3 as additives) at 1800 °C on a powder (SiC/Al2O3) bed provides optimum consolidation for the porous structures. The mechanical strength of the materials depends on their density. Freeze casted materials fabricated with bimodal particle size distributions (a controlled mixture of micro and nanoparticles) exhibit higher compressive strengths that can reach values of up to 280 MPa for materials with densities of 0.47.
Date Issued
2017-09-29
Date Acceptance
2017-09-28
Citation
Journal of the European Ceramic Society, 2017, 38 (3), pp.823-835
URI
DOI
ISSN
0955-2219
Publisher
Elsevier
Start Page
823
End Page
835
Journal / Book Title
Journal of the European Ceramic Society
Volume
38
Issue
3
Copyright Statement
© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Commission of the European Communities
Commission of the European Communities
Commission of the European Communities
US Army (US)
Office Of Naval Research Global
Grant Number
301909
289958
PIEF-GA-2011-301635
W911NF-13-1-0415
N62909-15-1-2063
Subjects
Science & Technology
Technology
Materials Science, Ceramics
Materials Science
Porous materials
SiC
Freeze casting
Emulsions
Strength
Thermal conductivity
SILICON-CARBIDE
MECHANICAL-PROPERTIES
HYBRID MATERIALS
CERAMICS
DENSIFICATION
ADDITIVES
POWDER
MICROSTRUCTURE
FABRICATION
PARTICLES
Publication Status
Published