Ultrafast high-temperature sintering of dense and textured alumina |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;3. Temasek Laboratories, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore;1. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. CEITEC BUT, Brno University of Technology, Purkynova 123, Brno 61200, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 61669, Czech Republic;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzho, 510006, China;2. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China;3. School of Environmental Sciences and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China;1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China;2. Department of Industrial Engineering, University of Trento, via Sommarive 9, 38123, Trento, Italy;3. Queen Mary University of London, Mile End Road, London, E1 4NS, UK |
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| Abstract: | Crystallographic texture engineering in ceramics is essential to achieve direction-specific properties. Current texture engineering methods are time-consuming, energy extensive, or can lead to unnecessary diffusion of added dopants. Herein, we explore ultrafast high-temperature sintering (UHS) to prepare dense and textured alumina using templated grain growth (TGG). From a slurry containing alumina microplatelets coated with Fe3O4 nanoparticles dispersed in a matrix of alumina nanoparticles, green bodies with oriented microplatelets were prepared using magnetic assisted slip casting (MASC). The effects of the sintering temperature, time and heating rate on the density and microstructure of the obtained ceramics were then studied. We found that TGG occurs for a temperature range between 1640 and 1780 °C and 10 s sintering time. Sintering at 1700 °C for 10 s led to dense and textured alumina with anisotropic grains thanks to the Fe3O4 coating, which did not have the time to diffuse. The highest texture and relative density were obtained with a heating rate of ~5500 °C/min, leading to texture-dependent anisotropic mechanical properties. This study opens new avenues for fabricating textured ceramics in ultra-short times. |
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| Keywords: | Crystallographic texture Ceramics Ultrafast high-temperature sintering Magnetic assisted slip casting Templated grain growth Density Anisotropic mechanical properties |
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