Fluoride-doped MWCNT/Si3N4 composite with improved mechanical and structural properties |
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| Institution: | 1. School of Materials Science and Engineering, Shandong University, Jinan 250061, China;2. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China;3. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;4. Institute for Advanced Study, Shenzhen University, Shenzhen 518060, Guangdong, China;1. Department of Physics, Alagappa University, Karaikudi 630 003;2. Department of Physics, Presidency College, Chennai, 600 005;3. Department of Physics, Kalasalingam Academy of Research and Education, Krishnankoil 626126, India;4. Division of Physics, School of Advanced Sciences, VIT University, Chennai 600127;1. Department of Physics, National Central University, Jung-Li 32001, Taiwan;2. Department of Physics, National Central University, Jung-Li 32001, Taiwan;3. Professor Emeritus, Department of Physics, National Sun Yat-sen University, Kaohsiung 8424, Taiwan;1. M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620990, Yekaterinburg, Russia |
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| Abstract: | The addition of carbon nanotubes (CNT) in ceramic composites has stimulated a substantial interest due to their high mechanical, thermal and electrical properties. This approach used fluoride additives (AlF3 and MgF2) to prepare multi-walled carbon nanotubes/silicon nitride (MWCNT/Si3N4) composite densified at 1700 °C for 1 h by hot press (HP) sintering. The microstructural analyses of MWCNT/Si3N4 composites indicate that the fluoride additives have substantially improved densification and the transformation of α-Si3N4 to β-Si3N4. As observed, the mechanical properties, i.e. flexural strength, fracture toughness, Young's modulus and hardness of MWCNT/Si3N4 composites are improved with an increasing concentration of MWCNT. These results attributed to the highly dense composites, strong interfacial interaction and the pull-out mechanism of MWCNT and β-Si3N4. The maximum values of fracture toughness flexural strength, Young's modulus, and hardness were 12.76 ± 1.15 MPa.m0.5, 883 ±46 MPa, 260 ±9 GPa, and 26.4 ± 1.3 GPa, respectively. The improved mechanical properties also ascribed to the synergistic strengthening and toughening influence of MWCNT and β-Si3N4. |
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