Mechanical and dielectric properties of Si3N4-SiO2 ceramics prepared by digital light processing based 3D printing and oxidation sintering |
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| Affiliation: | 1. Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structure, Beijing, 100081, China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, 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. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China;2. School of Civil Engineering and Architecture, Xi''an University of Technology, Xi’an, 710048, China;1. School of Mechanical and Electrical Engineering, Binzhou University, Binzhou, 256600, PR China;2. School of Mechanical Engineering, Shandong University, Jinan, 250061, PR China;3. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Jinan, 250061, PR China;4. State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | Si3N4-SiO2 ceramics are considered as the preferred high-performance wave-transmitting material in the aerospace field. However, traditional fabrication methods for Si3N4-SiO2 ceramics have the disadvantages of high cost and complicated fabrication process. In this paper, Si3N4-SiO2 ceramics with excellent mechanical and dielectric properties were fabricated by digital light processing-based 3D printing combined with oxidation sintering. Firstly, the curing thickness and viscosity of slurries with different solid loadings for vat photopolymerization-based 3D printing were studied. Then, the effects of the sintering temperature on the linear shrinkage, phase composition, microstructure, flexural strength, and dielectric properties of Si3N4-SiO2 ceramics, and the influences of solid loading on them were explored. The curing thickness and viscosity of the slurry with a solid loading of 55 vol% were 30 μm and ～1.5 Pa?s, respectively. The open porosity and the flexural strength of Si3N4-SiO2 ceramic with a solid loading of 55 vol% were 4.3 ± 0.61% and 76 ± 5.6 MPa, respectively. In the electromagnetic wave band of 8–18 GHz, the dielectric constant of Si3N4-SiO2 ceramics was within the range of less than 4, and the dielectric loss remained below 0.09. The method of digital light processing-based 3D printing combined with oxidation sintering can be further extended in the preparation of Si3N4-based structure-function integrated ceramics. |
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| Keywords: | Digital light processing based 3D printing Oxidation sintering Mechanical property Dielectric property |
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