Effects of SiC, SiO2 and CNTs nanoadditives on the properties of porous alumina-zirconia ceramics produced by a hybrid freeze casting-space holder method
| Autor: | Mohsen Asle Zaeem, Sami Abualnoun Ajeel, Nawal Ezzat Abdul Latiff, Aqeel Ali Al-Attar |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Sintering Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Porous silicon 01 natural sciences Casting 0104 chemical sciences Compressive strength visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Cubic zirconia Ceramic Composite material 0210 nano-technology Porosity |
| Zdroj: | Journal of the European Ceramic Society. 37:1635-1642 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2016.10.035 |
| Popis: | 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-SiO 2 , 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 132.5 MPa and porosity of 43.4%. Relatively low thermal conductivities, less than 3.5 W/K-m, were measured for samples with SiC nanoparticles. |
| Databáze: | OpenAIRE |
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