Preparation and properties of multilayer graphene reinforced binderless TiC nanocomposite cemented carbide through two-step sintering

Effect of Interfacial Structure on Mechanical Properties of Graphene Reinforced Al2O3–WC Matrix Ceramic Composite

“…It can be concluded that the ceramic composite incorporating with graphene can effectively improve densification and suppress grain growth. The improved relative density can be attributed to the high thermal and electrical conductivity of graphene, which can improve the heat distribution and further improve sintering performance during two-step HP [ 13 , 25 ]. The refined ceramic grains can be attributed to the pinning effect of graphene on ceramic grains and strong bonding interfaces between graphene and ceramic grains [ 26 ].…”

“…Figure 7 d shows the interfacial structure between Al 2 O 3 and WC in AWTG0.5; it can be seen that the Al 2 O 3 grain and WC grain are physically and tightly bonded without interfacial phases. The different interfacial bonding characteristics between Al 2 O 3 and WC in AWTG0 and AWTG0.5 can be attributed to the introduction of graphene in ATWG0.5, which improves the grain boundary diffusion by improving the distribution of current and heat in the composite [ 13 ]. In addition, the physical and tight bonding interface is beneficial to enhancing load transfer efficiency and improving interfacial bonding strength [ 14 , 40 ].…”

“…Composites with strong and weak bonding interfaces simultaneously can induce microcracks at the interfaces, thus improving strength and toughness [ 11 , 12 ]. Sun et al [ 13 ] found that excellent mechanical properties were achieved in MLG reinforced binderless TiC nanocomposite cemented carbide, and multi-phase and multi-scale strong–weak hybrid interfaces between MLG and matrix grains were responsible for the excellent mechanical properties.…”

“…In the first-step sintering, the green body is heated to a high temperature (T 1 ) with short dwell time or without dwell time, which is beneficial to obtain a critical relative density and makes pores unstable [ 18 ]. In the second-step sintering, the sintering sample is cooled to a lower temperature (T 2 ) with long dwell time; during this stage, grain boundary migration is frozen whereas grain boundary diffusion is active, which is beneficial to inhibiting grain growth while promoting densification [ 13 ]. In addition, the long dwell time in the second-step sintering can guarantee the completion of interfacial chemistry reaction and the formation of stable interfacial phases.…”

Investigation into the Structural, Chemical and High Mechanical Reforms in B4C with Graphene Composite Material Substitution for Potential Shielding Frame Applications

“…Additionally, in Figure 12 , RAMAN spectra was observed for different graphene nanoparticle ratios (0.2%, 0.4% and 0.6%). The RAMAN peaks were observed at nearly 1350 cm −1 and 1580 cm −1, and the small peak, was observed at 2700 cm −1 , indicating that during the sintering process, the graphene structure was not distorted [ 24 ]. There was a RAMAN peak shift and broadening in some areas, as shown in Figure 12 , due to the coexistence of B 4 C and graphene.…”