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<p>To enhance the bonding strength between flake graphite and the Cu matrix, the expandable flake graphite was successfully prepared via a chemical treatment involving perchloric acid, phosphoric acid, and KMnO<sub>4</sub>, followed by the deposition of a copper coating using an electroless method. Silica-reinforced Cu matrix composites were fabricated using flake graphite, Cu-coated flake graphite, and Cu-coated expandable flake graphite (denoted as FG, FG-Cu, and EFG-Cu) via powder metallurgy. The microstructure, density, hardness, and compressive strength of the composites were characterized. Their tribological behavior was evaluated using a pin-on-disk tribometer. The results indicate that the copper coating was deposited not only on the surface but also between the layers of the expandable flake graphite, creating an interdigitated structure within the composite. This unique structure significantly enhances interfacial bonding. Consequently, the EFG-Cu composite demonstrated superior properties: Its Brinell hardness (35.8 HBW) and compressive strength (129.33&#xa0;MPa) were approximately 15 and 29% higher, respectively, than those of the baseline FG composite (31.2 HBW, 100.35&#xa0;MPa). Furthermore, at a sliding speed of 6&#xa0;m/s, the EFG-Cu composite exhibited a higher friction coefficient (approximately 0.45) and a substantially lower wear rate (reduced by about 30-40%) compared to the FG and FG-Cu composites.</p>

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A Novel Structural Design of Flake Graphite for Improving the Mechanical and Tribological Properties of Silica-Reinforced Cu Matrix Composites

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Huadong Ye,
  • Haohao Zou,
  • Linwen Zhang,
  • Weiwei Zhu,
  • Ying Han,
  • Shengjian Zhou,
  • Suqiu Jia,
  • Xu Ran

摘要

To enhance the bonding strength between flake graphite and the Cu matrix, the expandable flake graphite was successfully prepared via a chemical treatment involving perchloric acid, phosphoric acid, and KMnO4, followed by the deposition of a copper coating using an electroless method. Silica-reinforced Cu matrix composites were fabricated using flake graphite, Cu-coated flake graphite, and Cu-coated expandable flake graphite (denoted as FG, FG-Cu, and EFG-Cu) via powder metallurgy. The microstructure, density, hardness, and compressive strength of the composites were characterized. Their tribological behavior was evaluated using a pin-on-disk tribometer. The results indicate that the copper coating was deposited not only on the surface but also between the layers of the expandable flake graphite, creating an interdigitated structure within the composite. This unique structure significantly enhances interfacial bonding. Consequently, the EFG-Cu composite demonstrated superior properties: Its Brinell hardness (35.8 HBW) and compressive strength (129.33 MPa) were approximately 15 and 29% higher, respectively, than those of the baseline FG composite (31.2 HBW, 100.35 MPa). Furthermore, at a sliding speed of 6 m/s, the EFG-Cu composite exhibited a higher friction coefficient (approximately 0.45) and a substantially lower wear rate (reduced by about 30-40%) compared to the FG and FG-Cu composites.