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| Research on Preparation and Properties of Direct Ink Writing of Continuous Carbon Fiber Reinforced Silicon Carbide Ceramic Matrix Composites |
| LI Sai, SUI Yunong, MIAO Kai, LU Zhongliang, LI Dichen |
| (State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China) |
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Abstract Continuous carbon fiber reinforced silicon carbide ceramic composites have the advantages of low density, high specific strength, high temperature resistance, etc., and have broad application prospects in high-tech fields such as nuclear energy and aerospace. Using direct ink writing technology, the continuous carbon fiber and silicon carbide ceramic matrix were simultaneously formed through the coaxial nozzle to realize the preparation of continuous fiber reinforced ceramic composite material and the control of its structure and performance. The effects of slurry solid content, extrusion flow, printing speed and printing layer thickness on the quality of direct ink writing green part were systematically studied, and it was characterized by XRD, SEM and mechanical properties testing methods. The results show that adding short carbon fibers to silicon carbide slurry can further improve the strength and toughness of continuous fiber toughened silicon carbide composites. The polymer infiltration and pyrolysis can reduce the fiber monofilament gap, so that the bending strength of the composite material can reach 146MPa, and the fracture toughness reaches 3.77MPa · m1/2. The research results of this paper provide experimental basis for the rapid manufacturing of continuous carbon fiber reinforced silicon carbide ceramic composite parts in the future.
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2021, 
