Ultra-superior mechanical properties of multilayer graphene nanosheets reinforced carbon-graphite materials

Carbon-graphite materials suffer from severe strength and mechanical characteristics due to inherent flaws such as micropores and microcracks. Incorporating high-temperature and high-pressure technologies in the carbon-graphite preparation process is thought to be an effective way to improve the microstructure and characteristics. The high temperature and high pressure generated by a cubic anvil in graphitization can greatly limit the creation of micropores and microcrack expansion in carbon-graphite materials during the preparation process, hence improving their density and mechanical strength. The results show that the synthesis temperature and pressure of 1250 °C and 2.4 GPa significantly improve the mechanical properties of the carbon-graphite materials, with compressive strength, flexural strength, and density of 208.1 MPa, 110.3 MPa, and 2.07 g/cm3, respectively, which outperform most carbon-graphite materials prepared using conventional techniques. It shows that the introduction of high temperature and high pressure effectively eliminates micropores and microcracks, promotes the CC bonding connection between the binder and the aggregate, and significantly improves the mechanical properties of carbon-graphite materials through the growth filling of multilayer graphene nanosheets, thereby significantly polishing up the microstructural integrity and properties of carbon-graphite materials.