**7. Processing challenges**

There are different parameters that have their roles in determining the final properties of composites, e.g., starting powder size selection, morphology of starting powders, choosing the appropriate volume fractions, various processing techniques, consolidation techniques, and sintering. All the above-mentioned properties play very important roles in fabricating cutting tool, but temperature, holding time, and pressure have major roles in spark plasma sintering technique to fabricate composite cutting tool. **Table 2** showed the study of various composite cutting tool with different percentage of graphene at different temperature, holding time, and pressure, and their effect on microstructure, densification, physical, mechanical properties, and thermal conductivity have been reviewed.

