Texture,microstructures, and mechanical properties of AlN‐based ceramics with Si3N4–Y2O3 additives |
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| Authors: | Cong Liu Wei‐Ming Guo Shi‐Kuan Sun Ji Zou Shang‐Hua Wu Hua‐Tay Lin |
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| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK;3. School of Metallurgy and Materials, University of Birmingham, Birmingham, UK |
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| Abstract: | Textured AlN‐based ceramics with improved mechanical properties were prepared by hot pressing using Si3N4 and Y2O3 as additives. The introduction of Si3N4–Y2O3 into AlN matrix led to the formation of secondary Y3AlSi2O7N2 and fiber‐like 2Hδ AlN‐polytypoid phases, the partial texture of all crystalline phases, and the fracture mode change from intergranular to transgranular. Consequently, Vickers hardness, fracture toughness and flexural strength of AlN‐based ceramics by the replacement of Y2O3 by Si3N4–Y2O3 increased significantly from 10.4±0.3 GPa, 2.4±0.3 MPa m½ and 333.3±10.3 MPa to 14.2±0.4 GPa, 3.4±0.1 MPa m½ and 389.5±45.5 MPa, respectively. |
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| Keywords: | aluminum nitride mechanical properties microstructure silicon nitride texture |
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