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<p>This paper examined the effect of adding nano-Si<sub>3</sub>N<sub>4</sub> to TiCN-Co-Cr<sub>3</sub>C<sub>2</sub>-based cermets. Powders of TiCN, Co, nano-Cr<sub>3</sub>C<sub>2</sub>, and nano-Si<sub>3</sub>N<sub>4</sub> were mixed uniformly to create compositions of 90% TiCN-5% Co-5% Cr<sub>3</sub>C<sub>2</sub> (Cermet TS-0), 85% TiCN-5% Co-5% Cr<sub>3</sub>C<sub>2</sub>-5% Si<sub>3</sub>N<sub>4</sub> (Cermet TS-5), 80% TiCN-5% Co-5% Cr<sub>3</sub>C<sub>2</sub>-10% Si<sub>3</sub>N<sub>4</sub> (Cermet TS-10), and 75% TiCN-5% Co-5% Cr<sub>3</sub>C<sub>2</sub>-15% Si<sub>3</sub>N<sub>4</sub> (Cermet TS-15). These mixtures were then sintered in a Vacuum hot press. Among them, TS-5 showed the best balance of hardness and fracture toughness, with values of 14.32 ± 0.73 GPa and 6.96 ± 0.52&#xa0;MPa√m, respectively. The study evaluated hardness, fracture toughness, microstructural changes, oxide-layer thickness, and phase formation following annealing. After annealing, TS-5's hardness and fracture toughness increased to 17.27 ± 0.57 GPa (at 1000&#xa0;°C) and 10.12 ± 0.68&#xa0;MPa√m (at 600&#xa0;°C). The TGA curve indicated no significant weight change up to 1000&#xa0;°C. Based on these results, cermet TS-5 is recommended for cutting tool applications.</p>

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Effect of Nano-Si₃N₄ Addition on the Microstructure, Mechanical Properties and Thermal Stability of TiCN–Co–Cr3C2 Cermets Fabricated via Vacuum Hot Pressing

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Venkadanathan Jothi,
  • Balasivanandha Prabu Shanmugavel

摘要

This paper examined the effect of adding nano-Si3N4 to TiCN-Co-Cr3C2-based cermets. Powders of TiCN, Co, nano-Cr3C2, and nano-Si3N4 were mixed uniformly to create compositions of 90% TiCN-5% Co-5% Cr3C2 (Cermet TS-0), 85% TiCN-5% Co-5% Cr3C2-5% Si3N4 (Cermet TS-5), 80% TiCN-5% Co-5% Cr3C2-10% Si3N4 (Cermet TS-10), and 75% TiCN-5% Co-5% Cr3C2-15% Si3N4 (Cermet TS-15). These mixtures were then sintered in a Vacuum hot press. Among them, TS-5 showed the best balance of hardness and fracture toughness, with values of 14.32 ± 0.73 GPa and 6.96 ± 0.52 MPa√m, respectively. The study evaluated hardness, fracture toughness, microstructural changes, oxide-layer thickness, and phase formation following annealing. After annealing, TS-5's hardness and fracture toughness increased to 17.27 ± 0.57 GPa (at 1000 °C) and 10.12 ± 0.68 MPa√m (at 600 °C). The TGA curve indicated no significant weight change up to 1000 °C. Based on these results, cermet TS-5 is recommended for cutting tool applications.