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<p>This study systematically investigates the effect of Ti<sub>3</sub>AlC<sub>2</sub> addition (0–1.5 wt.%) on WC-Co cemented carbides fabricated via powder metallurgy. Results demonstrate that Ti<sub>3</sub>AlC<sub>2</sub> effectively suppresses WC grain growth through decomposition-derived TiC<sub>ₓ</sub> and (W,Ti)C phase formation, reducing average grain size by 46.7% at 1.5 wt.% doping. Optimal 1.0 wt.% addition enhances hardness by 16.4% (20.89 GPa) with only 2.7% fracture toughness reduction (8.4 MPa·m<sup>1/2</sup>), while simultaneously achieving 24.5% lower steady-state friction coefficient (0.462) and 47.4% reduced wear rate (2.22×10<sup>–7</sup> mm<sup>3</sup>/(m·N)) under 50 N load. These improvements stem from the refinement of WC grains and the in-situ formation of Al<sub>2</sub>O<sub>3</sub>-rich tribofilms during sliding, establishing Ti<sub>3</sub>AlC<sub>2</sub> as a superior additive for developing wear-resistant cutting tools with balanced mechanical properties.</p>

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Effect of Ti3AlC2 as an Additive on the Mechanical and Tribological Properties of WC-Co Cemented Carbide

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • M. Li,
  • D. Wei,
  • M. F. Gong,
  • Z. Y. Guo,
  • D. Y. Mo,
  • W. G. Wu

摘要

This study systematically investigates the effect of Ti3AlC2 addition (0–1.5 wt.%) on WC-Co cemented carbides fabricated via powder metallurgy. Results demonstrate that Ti3AlC2 effectively suppresses WC grain growth through decomposition-derived TiCₓ and (W,Ti)C phase formation, reducing average grain size by 46.7% at 1.5 wt.% doping. Optimal 1.0 wt.% addition enhances hardness by 16.4% (20.89 GPa) with only 2.7% fracture toughness reduction (8.4 MPa·m1/2), while simultaneously achieving 24.5% lower steady-state friction coefficient (0.462) and 47.4% reduced wear rate (2.22×10–7 mm3/(m·N)) under 50 N load. These improvements stem from the refinement of WC grains and the in-situ formation of Al2O3-rich tribofilms during sliding, establishing Ti3AlC2 as a superior additive for developing wear-resistant cutting tools with balanced mechanical properties.