3D printing Si3N4-bonded SiC refractories fabricated using colloidal films-containing slurries based on non-spherical SiC and Si powders |
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| Affiliation: | 1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450000, China;2. Porcelain Gold Technology (Henan) Co. Ltd, Zhengzhou, 452470, China;3. Henan Polytechnic, Zhengzhou, 450046, China;4. School of 3D Printing, Xinxiang University, Xinxiang, 453003, China;1. Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China;2. Key Laboratory of Material Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China;1. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, PR China;2. School of Materials and Metallurgy, Guizhou University, Guiyang, Guizhou, 550025, PR China;1. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;2. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;1. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, 241000, PR China;2. Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin, 150001, PR China;3. School of Aeronautics and Astronautics, Sichuan University, Chengdu, 610065, China;4. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China |
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| Abstract: | Stable slurries for Si3N4-bonded SiC refractories for direct ink writing (DIW) were successfully prepared from a mixture of non-spherical silicon carbide (SiC) and silicon (Si) powders with an average particle size of D50 = 41.98 μm. The rheological properties and printability of slurries prepared using polyvinyl alcohol (PVA; 4–16 wt %) or hydroxypropyl methylcellulose (HPMC, 0.5–2 wt.%) were investigated with the effect of sintering temperature on the mechanical performance, phase, and microstructure of Si3N4-bonded SiC refractory products. The results indicated that slurries prepared with the HPMC solution showed better printability than those prepared with the PVA solution because colloidal films formed by HPMC in slurries play a role in encasing particles, preventing solid?liquid separation and contributing to plasticity and lubrication, which guarantees the smooth extrusion and homogeneity of slurries. The successful printing of SiC–Si slurries is not only related to proper viscosity, yield value, and shear thinning characteristics but it is also crucial for maintaining the homogeneity of slurries under extrusion pressure. Optimal SiC–Si slurries containing 52 vol % SiC–Si and 1.5 wt% HPMC exhibited proper viscosity, shear thinning, and homogeneity characteristics during printing. The obtained specimens achieved the best printing performance with height and section retention rates of 98.7% and 97.6%, respectively. When sintered at 1450 °C, Si3N4 fibres grow further and reach a diameter of 342.5 nm, the nitriding rate is 92.43%, the fibres tend to form a full network structure, and the mechanical properties of Si3N4-bonded SiC products are the best. |
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| Keywords: | Direct ink writing Rheological properties Homogeneity during printing 3D printing |
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