Effects of SiC,SiO2 and CNTs nanoadditives on the properties of porous alumina-zirconia ceramics produced by a hybrid freeze casting-space holder method |
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| Affiliation: | 1. Department of Production Engineering and Metallurgy, University of Technology—Baghdad, Alsinaa St. 35010, 011, Iraq;2. Department of Materials Science and Engineering, Missouri University of Science and Technology, 1400 N Bishop Ave, Rolla, MO 65409, USA;1. Department of Chemical Engineering and Materials Science, University of California Davis, Davis, CA 95616, USA;2. School of Materials Engineering, Gyeongsang National University, Jinju 660-701, Republic of Korea;3. School of Materials Science and Engineering, Yeungnam University, Gyeongbuk 712-749, Republic of Korea;1. Institute of Structures and Design, German Aerospace Center Stuttgart, Germany;2. Fraunhofer Center for High Temperature Materials and Design, Bayreuth, Germany;1. Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, PR China;2. Hunan Engineering Laboratory of Power Battery Cathode Materials, Changsha Research Institute of Mining and Metallurgy, Changsha 410012, PR China;3. School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China;1. School of Materials Science & Engineering, Chang''an University, Xi''an, 710061, People''s Republic of China;2. College of Communication Engineering, Chengdu University of Information Technology, Chengdu, 610225, People''s Republic of China;3. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People''s Republic of China |
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| 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 132.5 MPa and porosity of 43.4%. Relatively low thermal conductivities, less than 3.5 W/K-m, were measured for samples with SiC nanoparticles. |
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| Keywords: | Porous ceramics Alumina-zirconia Nanoadditives Freeze casting Space-holder |
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