*3.2.1 Mechanical properties*

Ceramic graphene composites believe to be mechanically strong, when subjects to certain appropriate conditions. Yao et al. [27] analyzed that size of grains and fracture toughness are interconnected by each other. Their idea was that increasing the size more than 0.5 µ*m* predominately effects fracture toughness. Therefore, alleviation in fracture toughness of composites like AWTG2 as well as AWTG3 can be elaborated on the basis of the elevated growth in ceramic grains. Low concentration of ceramic composites results in number of pores, that results in substantial reduction of the interfacial bonding between graphene and ceramic grains [28]. However, graphene tends to pull-out because of this weak interfacial bonding, thereby enhances fracture toughness. This proves to be the ultimate cause for better fracture toughness of AWTG4 clears in (**Table 1**) [29].
