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A TiCN-Co-Cr 3 C 2 -based cermet, with the addition of 5wt. % and 10wt. %Si 3 N 4  and a reference sample without Si 3 N 4  addition were prepared by the spark plasma sintering technique. The average hardness and fracture toughness of the 90TiCN-5Co-5Cr 3 C 2 (SN00) cermet-sintered specimens were e14.85±3.11 GPa and 6.78±0.61 MPaÖm, respectively. The cermet composition 85TiCN-5Co-5Cr 3 C 2 -5 wt. % Si 3 N 4 (SN05) enhanced the hardness and fracture toughness to 20.90±0.825 GPa and 7.23±0.45 MPaÖm, respectively. Further addition of 10 wt%Si 3 N 4  with 80TiCN-5Co-5Cr 3 C 2 (SN10) decreased the hardness value to 16.18±0.279 GPa due to a decrease in the density of defects. However, the fracture toughness steadily increased to 9.34±3.10 MPaÖm. The cermet composition 85TiCN-5Co-5Cr 3 C 2 -5Si 3 N 4  (SN05) showed an appreciable improvement in hardness and toughness values due to the formation of a core-rim structure, with the core consisting of TiCN and the rim with TiN, TiO 2 , TiSi, Co 2 C, CrN and Cr 2 Si .

Development of TiCN-Co-Cr 3 C 2 -Si 3 N 4 -based cermets with improved hardness and toughness for cutting tool applications