Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440691 | Journal of the European Ceramic Society | 2017 | 8 Pages |
Abstract
Highly porous alumina-zirconia ceramics were produced by adding space-holder materials during freeze casting. To increase the strength of porous ceramics, different amounts of nanoadditives (silicon carbide-SiC, silica-SiO2, and multi-wall carbon nanotubes-CNTs) were added. Space-holder materials were removed by preheating, and solid samples were produced by sintering. Up to 68% porosity was achieved when 40% space-holder was added to the solid load of slurry. Wall thicknesses between pores were more uniform and thinner when nanoadditives were added. Compressive tests revealed that SiC nanoparticles increased the strength more than other nanoadditives, and this was attributed to formation of an alumina-SiC phase and a uniform distribution of SiC nanoparticles. Results indicated that by including 20% space-holder materials and 15% SiC nanoparticles, the density decreases by 33.8% while maintaining a compressive strength of 132.5Â MPa and porosity of 43.4%. Relatively low thermal conductivities, less than 3.5Â W/K-m, were measured for samples with SiC nanoparticles.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Aqeel Ali Al-Attar, Mohsen Asle Zaeem, Sami Abualnoun Ajeel, Nawal Ezzat Abdul Latiff,