Abstract Herein, we describe the synthesis of multifunctional silicon carbide matrix composites by the in-situ growth of SiC in three-dimensionally printed graphene scaffolds by chemical vapor infiltration (CVI). Graphene-based scaffolds with various graphene contents, which are first assembled by three-dimensional (3D) printing, exhibit good adhesion and interlayer bonding. The content and morphology of the SiC matrix in the composite is controlled by optimizing the values of the CVI parameters, such as the holding time and gas pressure. The 3D graphene/SiC multifunctional composites exhibit outstanding mechanical performance, delivering a maximum compressive strength of 193 ± 15.7 MPa, which is 394% higher than that of the directly mixed product. The toughening mechanism induced by the graphene sheets, including pull-out and crack deflection, are clearly observed. The combination of 3D graphene scaffold and SiC matrix generates a larger number of conductive channels and provides a material that outperforms traditional ceramic materials in terms of electrical conductivity. It is expected that high-performance 3D graphene reinforced ceramic matrix composites with structural and functional integration will be prepared by introducing ceramic matrices into 3D graphene scaffolds.

中文翻译：

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三维石墨烯支架优化的多功能碳化硅基复合材料

摘要在此，我们描述了通过化学气相渗透 (CVI) 在三维印刷石墨烯支架中原位生长 SiC 来合成多功能碳化硅基复合材料。具有各种石墨烯含量的石墨烯基支架首先通过三维 (3D) 打印组装，表现出良好的附着力和层间粘合。复合材料中 SiC 基体的含量和形貌通过优化 CVI 参数值来控制，如保温时间和气体压力。3D石墨烯/碳化硅多功能复合材料表现出优异的机械性能，最大抗压强度为193±15.7 MPa，比直接混合产品高394%。石墨烯片引起的增韧机制，包括拉出和裂纹偏转，被清楚地观察到。3D 石墨烯支架和 SiC 基体的结合产生了更多的导电通道，并提供了一种在导电性方面优于传统陶瓷材料的材料。通过将陶瓷基体引入3D石墨烯支架，有望制备出具有结构和功能一体化的高性能3D石墨烯增强陶瓷基复合材料。