Optimized preceramic polymer for 3D structured ceramics via fused deposition modeling |
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Authors: | Lianzhong Zhao Xiaofeng Wang Huiwen Xiong Kechao Zhou Dou Zhang |
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Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. School of Materials Science and Engineering, Central South University, Changsha, 410083, China |
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Abstract: | 3D structured ceramics stemmed from preceramic polymers via additive manufacturing have attracted much attention recently. However, these polymers with high ceramic yield are so brittle that extrusion-based additive manufacturing techniques are hardly able to be utilized for assembling 3D structures. Herein, we developed a strategy to prepare feedstocks for these manufacturing techniques, i.e., utilizing a small amount of thermal-plastic polymer to optimize the preceramic polymer while good compatibility is required between the two polymers to ensure a homogeneous mixture. Polycarbosilane and polypropylene were selected as the representative materials. Polypropylene occupied a small proportion (≤5wt.%) and significantly improved the formability of the precursor. Three-dimensional SiC were obtained via fused deposition modeling combined with crosslinking and pyrolysis. The SiC ceramic filaments showed a mean tensile strength of 471 MPa. The strategy is also applicable to a large field of ceramic systems with corresponding precursor, such as sialon ceramic and multicomponent Si-based ceramics. |
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Keywords: | Fused deposition modeling 3D silicon carbide Preceramic polymer Polycarbosilane |
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