In this paper, the silicon carbide-reduced graphene oxide (SiC/rGO) composites with different content of rGO are investigated. The hot pressing (HP) at 2100 °C for 60 min under a uniaxial pressure of 40 M Pa resulted in a near fully-dense SiC/rGO composite. In addition, the influence of graphene reinforcement on the sintering process, microstructure, and mechanical properties (fracture toughness, bending strength, and Vickers hardness) of SiC/rGO composites is discussed. The fracture toughness of SiC/rGO composites (7.9MPam^1/2) was strongly enhanced by incorporating rGO into the SiC matrix, which was 97% higher than the solid-state sintering SiC ceramics (SSiC) by HP. Meanwhile, the bending strength of the composites reached 625 M Pa, which was 17.3% higher than the reference materials (SSiC). The microstructure of the composites revealed that SiC grains were isolated by rGO platelets, which lead to the toughening of the composite through rGO pull out/debonding and crack bridging mechanisms.

本文研究了不同rGO含量的碳化硅还原氧化石墨烯（SiC / rGO）复合材料。在40 M Pa的单轴压力下于2100°C进行60分钟的热压（HP），得到了接近完全致密的SiC / rGO复合材料。此外，还讨论了石墨烯增强对SiC / rGO复合材料的烧结过程，微观结构和机械性能（断裂韧性，弯曲强度和维氏硬度）的影响。SiC / rGO复合材料的断裂韧性（7.9MPam ^1/2通过将rGO掺入SiC基体中，可以大大增强），这比HP的固态烧结SiC陶瓷（SSiC）高97％。同时，复合材料的弯曲强度达到625 M Pa，比参考材料（SSiC）高17.3％。复合材料的微观结构表明，rGO片状晶体隔离了SiC晶粒，从而通过rGO拔出/脱粘和裂纹桥接机制导致了复合材料的增韧。