Influence of the content of polymethyl methacrylate on the properties of porous Si3N4 ceramics fabricated by digital light processing |
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| Affiliation: | 1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Engineering Research Center of Ceramic Materials for Additive Manufacturing, Ministry of Education, Wuhan, 430074, China;3. Wenzhou Key Laboratory of Microwave Communication Materials and Devices, Wenzhou Advanced Manufacturing Institute of HUST, Wenzhou, 325035, China;4. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;5. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MIIT China, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;6. School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300401, China;1. Department of Science and Humanities, Sri Krishna College of Engineering and Technology, Coimbatore, 641008, Tamilnadu, India;2. Department of Physics, KPR Institute of Engineering and Technology, Coimbatore, 641407, Tamilnadu, India;3. Physics Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia;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. School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China;2. Xuzhou College of Industrial Technology, Xuzhou, 221140, China;3. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China;1. Instituto de Física, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;2. CONACYT-Instituto de Física Luis Rivera Terrazas, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;3. Departamento de Física, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, D.F., C.P. 11801, Mexico;4. Grupo de Materiales Ferroicos de la Facultad de Física - Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, San Lázaro y L, 10400, Habana, Cuba;1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China;2. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravskia cesta 9, SK-84536, Bratislava, Slovakia;1. Department of Pharmaceutical Engineering, School of Life and Health Sciences, Huzhou College, 313000, Huzhou, China;2. School of Materials Science and Engineering, Tianjin Chengjian University, 300384, Tianjin, China;3. Tianjin Key Laboratory of Building Green Functional Materials, 300384, Tianjin, China |
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| Abstract: | Porous Si3N4 ceramics are highly regarded as ideal materials for radomes due to their unique characteristics. However, the slurry used for the preparation of porous Si3N4 ceramics suffers from a low cure depth, making it challenging to fabricate ceramic components using DLP technology. In this study, porous Si3N4 ceramics were prepared by combining DLP technology with pore-forming agent method. The addition of polymethyl methacrylate (PMMA) powders with lower refractive index than that of Si3N4 powders can improve the penetration depth of ultraviolet light in the Si3N4 slurry. A systematic study was conducted to investigate the influence of the addition of PMMA powders on the properties of Si3N4 slurries and porous Si3N4 ceramics. When PMMA powders were added at 10 wt%, the slurry with a lowest viscosity of 0.13 Pa s (the shear rate is 30 s−1) and cure depth of 40.0 μm (the exposure energy is 600 mJ/cm2) was obtained. With the increase of PMMA content, porous Si3N4 ceramics experienced a gradual decrease in both the flexural strength and bulk density, while the porosity increased from 14.41% to 27.62%. Specifically, when 20 wt% PMMA was added, the resulting porous Si3N4 ceramics had a lowest bulk density (2.41 g/cm3), a maximum porosity (27.62%), and a flexural strength (435.87 MPa). The study is of great significance in establishing an experimental foundation for fabricating porous Si3N4 ceramics by using DLP technology. |
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| Keywords: | Pore-forming agents DLP technology Mechanical properties |
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