Additive manufacturing of SiC-Sialon refractory with excellent properties by direct ink writing |
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| Affiliation: | 1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China;2. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA;3. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China;4. China Aerospace Science and Technology Corporation, Beijing 100048, China;1. Neutron Scattering Technical Engineering Research Center, School of Mechanical Engineering, Dongguan University of Technology, Dongguan, 523808, Guangdong, China;2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China;1. Department of Chemical Engineering Materials Environment, Sapienza-Università di Roma, Via Eudossiana 18, 00184 Rome, Italy;2. Engineering Department, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy;1. The School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 300063, China;2. State Key Laboratory of Mineral Processing, Beijing, China;3. Puyang Refractories Group Co., Ltd., The middle of Xihua Road, Puyang County, Henan Province, China;4. School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China;5. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;2. Advanced Research Center, Central South University, Changsha 410083, China;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China;2. Jiaxing CeramPlus Technology Co., Ltd, Jiaxing, 314100, China;3. Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, PR China |
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| Abstract: | Additive manufacturing of SiC-Sialon refractory with complex geometries was achieved using direct ink writing processes, followed by pressureless sintering under nitrogen. The effects of particle size of SiC powders, solid content of slurries and additives on the rheology, thixotropy and viscoelasticity of ceramic slurries were investigated. The optimal slurry with a high solid content was composed of 81 wt% SiC (3.5 µm+0.65 µm), Al2O3 and SiO2 powders, 0.2 wt% dispersant, and 2.8 wt% binder. Furthermore, the accuracy of the structure of specimens was improved via adjustment of the printing parameters, including nozzle size, extrusion pressure, and layer height. The density and flexural strength of the printed SiC-Sialon refractory sintered at 1600 °C were 2.43 g/cm3 and 85 MPa, respectively. In addition, the printed SiC-Sialon crucible demonstrated excellent corrosion resistance to iron slag. Compared to the printed crucible bottom, the crucible side wall was minimally affected by molten slag. |
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| Keywords: | 3D printing SiC-Sialon refractory Rheology Printing parameters Complex-shape |
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