Effect of polystyrene addition on 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. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;4. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MIIT China, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;1. School of Materials and Energy, Southwest University, Chongqing, 400715, China;2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;1. Department of Ceramic Engineering, IIT BHU, Varanasi, 201005, India;2. Department of Mechanical Engineering, IIT BHU, Varanasi, 201005, India;3. Department of Chemistry, Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, 52900, Ramat Gan, Israel;1. Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Unità di Ricerca del Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Università degli Studi di Cagliari, 09123, Cagliari, Italy;2. Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, 07100, Sassari, Italy;3. Dipartimento di Fisica, Università degli Studi di Cagliari, 09042, Monserrato, Cagliari, Italy;4. Department of Physics and Astronomy, University of Notre Dame, Notre Dame, 46556, IN, United States;1. School of Energy & Environmental Engineering, Hebei Engineering Research Center of Pollution Control in Power System, Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, Tianjin, 300401, PR China;2. Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment, Beijing, 100029, PR China;3. College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin, 300350, PR China;4. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300401, PR China |
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| Abstract: | Porous Si3N4 ceramics with high strength and high transmittance have been widely used in the field of defense and military. Additive manufacturing (AM) technology is one of the effective means to fabricate porous Si3N4 ceramics. Nevertheless, it is difficult to prepare porous Si3N4 ceramics by using digital light processing (DLP) because of the large refractive index difference between Si3N4 powders and photosensitive resin. In this study, the effects of the amount of polystyrene (PS) powders on the properties of Si3N4 ceramic slurries and sintered ceramics were systematically discussed. The addition of PS reduced the overall refractive index of powders and increased the average particle size of powders, thus improving the cure depth of Si3N4 ceramic slurries from 11.0 ± 2.0 μm to 55.7 ± 1.8 μm. With the increase of PS content, the shrinkage and porosity of Si3N4 ceramics gradually increased, and the bulk density and flexural strength showed the opposite trend. The slurry with low viscosity (2.38 Pa٠s at a shear rate of 30 s−1) and high cure depth (51.2 ± 4.6 μm) was obtained when the content of PS was 15 wt%, which met the thickness requirements for printing. The total porosity of Si3N4 ceramics reached the maximum values at 28.21 ± 2.58%. The addition of PS solved the problem of low cure depth of slurries, and PS as a pore-forming agent could help Si3N4 ceramics form porous structure. This research provides valuable insights into the fabrication of non-oxide ceramics with high refractive index using DLP technology. |
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| Keywords: | Digital light processing Cure depth Mechanical properties |
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