SiC porous structures obtained with innovative shaping technologies

Ferraro, C, Garcia-Tunon Blanca, E ORCID: 0000-0001-9507-4501, Barg, S, Miranda, M, Ni, N, Bell, R and Saiz, E (2017) SiC porous structures obtained with innovative shaping technologies. Journal of the European Ceramic Society, 38 (3). pp. 823-835.

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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 280 MPa for materials with densities of 0.47.

Item Type:	Article
Uncontrolled Keywords:	Porous materials, SiC, Freeze casting, Emulsions, Strength, Thermal conductivity
Depositing User:	Symplectic Admin
Date Deposited:	19 Oct 2017 09:29
Last Modified:	19 Jan 2023 06:52
DOI:	10.1016/j.jeurceramsoc.2017.09.048
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3010420