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<p>Cu/diamond composites were fabricated by hot pressing at 600&#xa0;°C at 200&#xa0;MPa. The matrix consisted of Cu and Sn, while Co was added to study its effect. Also, Ti-coated and non-coated diamond particles reinforced the Cu alloy matrix. The results showed that the Cu alloy matrix containing Co exhibited less porosity, refined precipitates, and better distribution of the precipitates. Moreover, the composite sample containing non-coated diamond and Co in its matrix had the highest hardness, flexural strength, and wear resistance among the composite samples due to the high lattice mismatch between TiC and diamond. This showed the semicoherent nature of the Cu/diamond interface, resulting in a lower strength of the interfacial bonding. Therefore, several regions indicating the fracture of Ti-coated diamond were found along with grooves and regions of material removal in the wear surface with coarser wear debris than the composite reinforced with non-coated diamond particles.</p>

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Synergistic Effects of Titanium Coating and Cobalt on Cu/Diamond Composites: A Path to Superior Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Ali Alizadeh,
  • Ramin Soltani Bidar,
  • Majid Bagheri,
  • Mohsen Hajizamani,
  • Mohammad Reza Zahmatkesh

摘要

Cu/diamond composites were fabricated by hot pressing at 600 °C at 200 MPa. The matrix consisted of Cu and Sn, while Co was added to study its effect. Also, Ti-coated and non-coated diamond particles reinforced the Cu alloy matrix. The results showed that the Cu alloy matrix containing Co exhibited less porosity, refined precipitates, and better distribution of the precipitates. Moreover, the composite sample containing non-coated diamond and Co in its matrix had the highest hardness, flexural strength, and wear resistance among the composite samples due to the high lattice mismatch between TiC and diamond. This showed the semicoherent nature of the Cu/diamond interface, resulting in a lower strength of the interfacial bonding. Therefore, several regions indicating the fracture of Ti-coated diamond were found along with grooves and regions of material removal in the wear surface with coarser wear debris than the composite reinforced with non-coated diamond particles.