Si3N4-ZrB2 ceramics prepared at low temperature with improved mechanical properties |
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| Affiliation: | 1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;2. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong, China;3. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;4. Qingdao Center of Resource Chemistry & New Materials, Qingdao, 266000, China;5. Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai, 264006, Shandong, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China |
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| Abstract: | Si3N4-ZrB2 ceramics were hot-pressed at 1500 °C using self-synthesized fine ZrB2 powders containing 2.0 wt% B2O3 together with MgO-Re2O3 (Re = Y, Yb) additives. Both Si3N4 and ZrB2 grains in the hot-pressed ceramics were featured with elongated and equiaxed morphology. The presence of elongated Si3N4 and ZrB2 grains led to the partial texture of the ceramics under the applied pressure. Vickers hardness and fracture toughness of Si3N4-ZrB2 ceramics with MgO-Re2O3 additives prepared at low temperature were about 19–20 GPa and 9–11 MPa m1/2, respectively, higher than the reported values of Si3N4-based ceramics prepared at high temperature (1800 °C or above) under the same test method. |
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| Keywords: | Elongated grains Microstructure Hardness Toughness |
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