Pressureless sintered Al4SiC4 ceramics with Y2O3 addition |
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| Affiliation: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;4. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;5. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516003, China;1. Functional Materials and Acousto-optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;2. Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, China;3. School of Physics and Electronic Engineering, Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China;1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China;3. School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;4. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Longzhong Laboratory, Xiangyang 441000, Hubei, China;1. Technical University Darmstadt, Institute of Applied Geosciences, Schnittspahnstr. 9, D-64287 Darmstadt, Germany;2. Technical University Darmstadt, Institute of Materials Science, Otto-Berndt-Str. 3, D-64287 Darmstadt, Germany;3. Fraunhofer IWKS, Department Digitalization of Resources, Brentanostr. 2a, D-63755 Alzenau, Germany;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083 China |
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| Abstract: | Highly densified Al4SiC4 ceramics with a relative density of 96.1% were prepared by pressureless sintering using 2 wt% Y2O3 as additives. The densification mechanism, phase composition, microstructures and mechanical properties of Al4SiC4 ceramics were investigated. Y2O3 in-situ reacted with the oxygen impurities in Al4SiC4 powder to form a yttrium aluminate liquid phase during sintering, which promoted the densification and anisotropic grain growth. The final Al4SiC4 ceramics were composed of equiaxed grains and columnar grains, and presented a bimodal grain distribution. The mechanical properties of the pressureless sintered Al4SiC4 ceramics were better than those reported for hot pressed Al4SiC4, including a flexural strength of 369 ± 24 MPa, fracture toughness of 4.8 ± 0.1 MPa m1/2 and Vickers hardness of 11.3 ± 0.2 GPa. Pressureless sintering of Al4SiC4 ceramics is of great significance for the development and practical application of Al4SiC4 ceramic parts, especially with big size and complex shape. |
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| Keywords: | Pressureless sintering Microstructure Mechanical properties |
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