SiC porous structures obtained with innovative shaping technologies

Claudio Ferraro, Esther Garcia-Tunon, Suelen Barg, Miriam Miranda, Na Ni, Robert Bell, Eduardo Saiz

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    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 280MPa for materials with densities of 0.47.

    Original languageEnglish
    JournalJournal of the European Ceramic Society
    Early online date29 Sept 2017
    DOIs
    Publication statusPublished - Mar 2018

    Keywords

    • Emulsions
    • Freeze casting
    • Porous materials
    • SiC
    • Strength
    • Thermal conductivity

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