matrix

gnps

graphene_74383

spark plasma

nanoplatelets

graphene_73042

gnps_103537

microstructure_63485

graphene nanoplatelets

onion-like

Materials Science and Engineering A

Graphene NanoPlatelets (GNP) reinforced tantalum carbide composites are synthesized by spark plasma sintering (SPS) at processing conditions of 1850 °C and 80–100 MPa. The GNP addition enhances the densification of TaC–GNP composites to 99% theoretical density, while reducing the grain size by over 60% through grain wrapping mechanism. Survival and structure retention of GNP is confirmed through scanning electron microscopy and micro-Raman spectroscopy. Nanoindentation and high load (20–30 N) microindentation are utilized to evaluate elastic modulus and hardness. GNP improves fracture toughness of TaC by up to 99% through toughening mechanisms such as GNP bending, sheet sliding, cracking bridging, and crack deflection.

Graphene NanoPlatelets reinforced tantalum carbide consolidated by spark plasma sintering