Fabrication of Si3N4 ceramics by post-reaction sintering using Si–Y2O3–Al2O3 nanocomposite particles prepared by mechanical treatment |
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| Affiliation: | 1. Yokohama National University, Yokohama 240-8501, Japan;2. Kanagawa Academy of Science and Technology, Kawasaki 213-0012, Japan;1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;1. Departamento de Química (QMC), Universidade Federal de Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;2. Departamento de Química, Universidade Federal do Paraná (UFPR), 81531-980 Curitiba, PR, Brazil;3. Instituto Nacional de Ciência e Tecnologia de Energia e Ambiente (INCT E&A), Universidade Federal da Bahia (UFBA), 40170-115 Salvador, BA, Brazil;4. Departamento de Engenharia Química (EQA), Universidade Federal de Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;5. Departamento de Engenharia de Materiais e Cerâmica, Universidade de Aveiro, 3810-193 Aveiro, Portugal;1. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;2. Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;3. Department of Chemistry, College of Science and Arts, Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;4. PG Department of Chemistry, JCDAV College (Panjab University), Dasuya 144205, Punjab, India;5. Research Centre, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;2. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;3. National Engineering Research Center for Municipal Wastewater Treatment and Reuse, Mianyang 621000, Sichuan, China;1. Dpto. Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain;2. Institut Laue Langevin, 71 Av. des Martyrs, F38042 Grenoble, France;3. Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid, Spain |
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| Abstract: | Post-reaction sintering of a powder compact of Si and sintering aids is a useful technique for fabricating silicon nitride (Si3N4) ceramics at low costs. In order to inhibit the inhomogeneous and uncontrollable exothermic nitridation of Si in the powder compact, Si–Y2O3–Al2O3 nanocomposite particles are designed as an aid for post-reaction sintering. These Si–Y2O3–Al2O3 nanocomposite particles are prepared via mechanical treatment applying high shear stress. Scanning electron microscopy (SEM) observations show that Y2O3 and Al2O3 particles are homogenously dispersed, and fixed to the Si particles. A green compact prepared using the Si–Y2O3–Al2O3 nanocomposite particles results in lower electrical resistivity than that prepared using a powder mixed by wet ball-milling, which suggests that Si particles in the green compact prepared using the nanocomposite particles are isolated by Y2O3 and Al2O3 particles. The isolation of Si particles by the sintering aids successfully prevents the Si particles from melting and agglomerating during the nitridation process, resulting in a higher nitridation ratio and higher α-Si3N4 phase content due to the inhibition of rapid heat transfer caused by the exothermic reaction. The nitridation ratio also increases with the applied power during mechanical treatment. As a result of firing the homogeneously nitrided powder compacts at high temperatures, Si3N4 ceramics with homogeneous microstructure and improved density are successfully fabricated in this manner. |
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| Keywords: | Post-reaction sintering Nitridation Nanocomposite particle Mechanical treatment |
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