Microstructure and fracture toughness of SiAlCN ceramics toughened by SiCw or GNPs |
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| Affiliation: | 1. Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing, 100191, China;2. Research Institute for Frontier Science, Beihang University, Beijing, 100191, China;1. Department of Neutron Physics, Czech Academy of Sciences, Nuclear Physics Institute, Husinec-?e?, ?p. 130, 250 68 ?e?, Czech Republic;2. Department of Physics, Faculty of Science, J.E. Purkyně University, Pasteurova 3544/1, 400 96, Ústi Nad Labem, Czech Republic;3. Department of Inorganic Chemistry, University of Chemistry and Technology in Prague, 166 28, Prague, Czech Republic;4. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2026/5, 121 16, Prague 2, Czech Republic;5. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlá?ská 2, 61137, Brno, Czech Republic;6. Department of Material Analysis, FZU - Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech Republic;1. Laboratório de Materiais Vítreos, Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil;2. Laboratório de Hematologia e Células-tronco, Faculdade de Farmácia, Universidade Federal Do Rio Grande Do Sul, 90610-000, Porto Alegre, RS, Brazil;3. Universidade Federal de Ciências da Saúde de Porto Alegre, 90050-170, Porto Alegre, RS, Brazil;4. Instituto de Pesquisa Com Células-tronco, 90020-010, Porto Alegre, RS, Brazil;5. Faculdade de Odontologia de Araçatuba, Departamento de Odontologia Preventiva e Restauradora, Universidade Estadual Paulista Júlio de Mesquita Filho, 16015-050, Araçatuba, SP, Brazil;6. Laboratório de Ensaios Antimicrobianos, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, 38400-902, Uberlândia, MG, Brazil;1. School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, PR China;2. Zhejiang Engineering Research Center of New Organic Functional Molecules Synthesis and Application, Wenzhou Institute of Industry & Science, Wenzhou, 325006, PR China;3. Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325006, PR China;1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Mengxi Road 2, Zhenjiang, Jiangsu Province, 212003, China;2. University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, Rua Luís Reis Santos, 3030-788, Coimbra, Portugal;3. Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei, 230031, China |
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| Abstract: | Mechanical alloying and spark plasma sintering (SPS) were used to prepare dense SiAlCN ceramic and SiAlCN ceramic toughened by SiC whiskers (SiCw) or graphene nanoplatelets (GNPs). The influences of different reinforcements on the microstructure and fracture toughness were investigated. The SiAlCN ceramic exhibited a fracture toughness of 4.4 MPa m1/2 and the fracture characteristics of grain bridging, alternative intergranular and transgranular fracture. The fracture toughness of SiCw/SiAlCN ceramic increased to 5.8 MPa m1/2 and toughening mechanisms were crack deflection, SiCw bridging and pull-out. The fracture toughness of GNP/SiAlCN ceramic increased significantly, which was up to 6.6 MPa m1/2. GNPs played an important role in grain refinement, which resulted in the smallest grain size. Multiple toughening mechanisms, including crack deflection, crack branch, GNP bridging and pull-out could be found. The better toughening effect could be attributed to the larger specific surface area of GNPs and the appropriate interface bonding between GNPs and matrix. |
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| Keywords: | SiAlCN ceramics SiC whiskers Graphene nanoplatelets Fracture toughness |
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