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<p>In this study, hybrid boron nitride-nano silica solid self-lubricating filler (hBN-SiO₂) was prepared via in-situ growth method. Using lubricating oil containing hBN-SiO₂ as the core material and polyimide (PI) as the wall material, solid-liquid coupled self-lubricating microcapsules (OIL/hBN-SiO₂@PI) were fabricated. These capsules exhibit high core content (OIL content: 56 wt%) and excellent thermal stability (mass loss of only 9.8 wt% after constant temperature at 310&#xa0;°C for 3&#xa0;h). These microcapsules can notably improve the tribological performance of Polyphthalazinone Ether Ketone (PPEK). Specifically, for the PPEK-OIL/hBN-SiO₂@PI composite, the wear rate (ω = 1.70 × 10⁻¹⁵ m³/(N·m)) and friction coefficient (µ = 0.089) are reduced by 91.5% and 86.0% respectively. The interfacial friction region develops a stable transfer film owing to a distinctive “solid-liquid synergistic” lubrication mechanism. This work provides new insights for designing high-temperature-resistant solid-liquid coupled capsules and developing self-lubricating polymer composites.</p>

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Solid-liquid coupled self-lubricating microcapsules with a wide temperature range: tribological applications in polymer composites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月4日

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  • Qingguang Bao,
  • Xuemei Yan,
  • Ning Wang,
  • Ye Hu,
  • Yi Dong,
  • Shan Cheng,
  • Nan Li,
  • Xigao Jian

摘要

In this study, hybrid boron nitride-nano silica solid self-lubricating filler (hBN-SiO₂) was prepared via in-situ growth method. Using lubricating oil containing hBN-SiO₂ as the core material and polyimide (PI) as the wall material, solid-liquid coupled self-lubricating microcapsules (OIL/hBN-SiO₂@PI) were fabricated. These capsules exhibit high core content (OIL content: 56 wt%) and excellent thermal stability (mass loss of only 9.8 wt% after constant temperature at 310 °C for 3 h). These microcapsules can notably improve the tribological performance of Polyphthalazinone Ether Ketone (PPEK). Specifically, for the PPEK-OIL/hBN-SiO₂@PI composite, the wear rate (ω = 1.70 × 10⁻¹⁵ m³/(N·m)) and friction coefficient (µ = 0.089) are reduced by 91.5% and 86.0% respectively. The interfacial friction region develops a stable transfer film owing to a distinctive “solid-liquid synergistic” lubrication mechanism. This work provides new insights for designing high-temperature-resistant solid-liquid coupled capsules and developing self-lubricating polymer composites.