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The trial-and-error method used in ceramics research has certain limitations such as the high blindness of material component design. Moreover, calculations of the toughness of ceramics using the extended finite element method, which is the most broadly applied technique, are complicated. To overcome these issues, in this study, multilayer graphene (MLG)/Si 3 N 4 whisker (Si 3 N 4w)-reinforced Si 3 N 4 ceramics (MWSCs) were used as the model material, and the modeling of MWSCs was conducted using Voronoi tessellation. Additionally, a more concise novel approach was applied for the prediction of the fracture toughness of MWSCs. Furthermore, the optimal MLG and Si 3 N 4w contents were predicted, and then they were verified by fabricating MWSCs using spark plasma sintering (SPS). Simulation results indicated that the optimum MLG and Si 3 N 4w contents to enable the toughness and hardness to reach the maximum values (9.87 MPa·m1/2 and 23.19 GPa) were 1 wt% and 3 wt%, which were consistent with the experimental results. Consequently, the effectiveness of the proposed method was verified. Moreover, the experimental values of the maximum fracture toughness and hardness were 11.04 MPa·m1/2 and 20.29 GPa, which were 47.20% and 12.10% higher than those of Si 3 N 4 ceramics reinforced with 1 wt% MLG, respectively. The synergistic toughening effects of MLG and Si 3 N 4w were significantly reflected. The load-bearing effect, bridging, and crack deflection induced by MLG and Si 3 N 4w were the key reasons for the improvement in the mechanical properties of MWSCs. [ABSTRACT FROM AUTHOR]

The poor thermal properties of ceramics limited its wide application. Recently, upgrading via reinforcing ceramics with graphene has been recognized as a feasible approach to enhance the thermal performance of ceramics, and then advance the applications due to the exceptional thermal properties of graphene. Thus, this review summarized the latest advances in manufacturing process, microstructure as well as the thermal properties of graphene reinforced ceramics (GRC), highlighting the impacts of sintering techniques, sintering parameters and graphene/ceramic matrix parameters on the thermal performance of GRC. Furthermore, microstructure model simulation was proposed as a supplement to the traditional trial and error method, so as to facilitate the research associated with GRC. Besides, the challenges coupled with outlook for GRC with the superior thermal properties were also envisioned to providing readers with deep understanding of future development of GRC. [ABSTRACT FROM AUTHOR]