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<p>Metal matrix composites (MMCs) have attracted the interest of researchers due to its potential to improve tribological and mechanical properties. This study investigates the influence of ceramic reinforcement of TiC/CaF<sub>2</sub> on physical, mechanical and friction characteristics of CuNi alloy/TiC MMCs. The composites reinforced with CaF<sub>2</sub> particles (0, 4, 8 wt&#xa0;pct) were developed by powder metallurgy, using solid-state sintering. The homogeneous dispersion of TiC/CaF<sub>2</sub> particles in the Cu–Ni matrix was confirmed by microstructure analysis. The CuNi/10 wt pct TiC composite exhibited the highest density (7.32 g/cm<sup>3</sup>) and hardness (40.6 HV/0.1). Among all the composites tested, the lowest COF of (0.21) was observed for CuNi + (10&#xa0;wt pct)TiC + (8&#xa0;wt pct)CaF<sub>2</sub>. The COF of the CuNi + (10&#xa0;wt pct)TiC + (8&#xa0;wt pct)CaF<sub>2</sub> composite is reduced by 62.5 pct compared to the current material. Friction-induced chemical reactions resulted in the development of oxides (Cu<sub>2</sub>O, NiO, Fe<sub>2</sub>O<sub>3</sub>, and TiO<sub>2</sub> phases) at the contact interface, substantially influencing tribological characteristics and wear mechanisms. Delamination, tribo-oxidation wear, adhesive wear, and abrasive wear were the main wear mechanisms observed in the fabricated composites.</p> Graphical Abstract <p></p>

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A Novel Ceramic Reinforced Metal Matrix Composite (Cu–Ni/TiC–CaF2): Fabrication, Microstructure, Mechanical and Tribological Characterization

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Chandra Shekhar,
  • M. F. Wani,
  • Rakesh Sehgal,
  • Umida Ziyamukhamedova,
  • Nodirjon Tursunov

摘要

Metal matrix composites (MMCs) have attracted the interest of researchers due to its potential to improve tribological and mechanical properties. This study investigates the influence of ceramic reinforcement of TiC/CaF2 on physical, mechanical and friction characteristics of CuNi alloy/TiC MMCs. The composites reinforced with CaF2 particles (0, 4, 8 wt pct) were developed by powder metallurgy, using solid-state sintering. The homogeneous dispersion of TiC/CaF2 particles in the Cu–Ni matrix was confirmed by microstructure analysis. The CuNi/10 wt pct TiC composite exhibited the highest density (7.32 g/cm3) and hardness (40.6 HV/0.1). Among all the composites tested, the lowest COF of (0.21) was observed for CuNi + (10 wt pct)TiC + (8 wt pct)CaF2. The COF of the CuNi + (10 wt pct)TiC + (8 wt pct)CaF2 composite is reduced by 62.5 pct compared to the current material. Friction-induced chemical reactions resulted in the development of oxides (Cu2O, NiO, Fe2O3, and TiO2 phases) at the contact interface, substantially influencing tribological characteristics and wear mechanisms. Delamination, tribo-oxidation wear, adhesive wear, and abrasive wear were the main wear mechanisms observed in the fabricated composites.

Graphical Abstract