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<p>A novel lead-free Cu-10Sn-5Bi-0.5TiBN composite was developed using self-synthesized TiBN as the wear-resistant phase to address the poor wear resistance, copper layer delamination, and lead pollution in Cu-10Sn-10Pb coatings for piston pump cylinders. Near-spherical (~3&#xa0;μm) and uniformly distributed Cu-Sn-Bi-TiBN powders with enhanced elemental solid solution were produced using variable-speed ball milling. Optimal sintering at 980&#xa0;°C for 90&#xa0;min yielded a pore-free, metallurgically bonded Cu/steel composite. The composite with 0.5&#xa0;wt.% TiBN exhibited superior properties, with a 119.47&#xa0;HV hardness (8.9% higher than commercial Cu-Sn-Pb), a 0.25 friction coefficient (44% reduction), and a 0.351-μm wear depth (80% reduction). TiBN refined Bi precipitates into a worm-like morphology, which improved wear resistance. This material demonstrated a significant potential for eco-friendly piston pump applications.</p>

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Development of Copper Layer Material and Study on Microstructure and Properties of Copper/Steel Bimetal Piston Pump Cylinder Block

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Ping Lu,
  • Sen Lu,
  • Junquan Zhang,
  • Mengran Liu,
  • Fulong Zhang,
  • Shuangyu Liu

摘要

A novel lead-free Cu-10Sn-5Bi-0.5TiBN composite was developed using self-synthesized TiBN as the wear-resistant phase to address the poor wear resistance, copper layer delamination, and lead pollution in Cu-10Sn-10Pb coatings for piston pump cylinders. Near-spherical (~3 μm) and uniformly distributed Cu-Sn-Bi-TiBN powders with enhanced elemental solid solution were produced using variable-speed ball milling. Optimal sintering at 980 °C for 90 min yielded a pore-free, metallurgically bonded Cu/steel composite. The composite with 0.5 wt.% TiBN exhibited superior properties, with a 119.47 HV hardness (8.9% higher than commercial Cu-Sn-Pb), a 0.25 friction coefficient (44% reduction), and a 0.351-μm wear depth (80% reduction). TiBN refined Bi precipitates into a worm-like morphology, which improved wear resistance. This material demonstrated a significant potential for eco-friendly piston pump applications.