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<p>Extreme conditions, such as elevated temperatures and heavy loads, pose significant challenges to grease performance, resulting in increased friction and wear due to reduced lubrication effectiveness. To address this issue, this study presents the synthesis of graphene oxide/magnesium oxide (GO-MgO, GOM) composites using the REDOX method, followed by modification with a silane coupling agent. The modified graphene oxide/magnesium oxide (KH-GO-MgO, KGOM) composites were prepared through high-energy ball milling. The lubrication properties of GOM and KGOM in base grease under high temperatures and heavy loads were evaluated using an SRV-4 friction and wear testing machine. The experimental results showed that lubricants containing a 0.5% mass fraction of GOM and KGOM exhibited lower and more stable friction coefficients compared to the base grease, demonstrating improved high-temperature lubrication and thermal stability. Notably, KGOM displayed enhanced anti-friction and anti-wear properties. At 175&#xa0;°C and a load of 150&#xa0;N, the wear width and maximum depth for the base grease were 455.6 and 13.4&#xa0;μm, respectively, indicating significant wear. Even under high-temperature conditions, KGOM grease exhibited a narrower wear width (402.9&#xa0;μm) and maximum depth (9.1&#xa0;μm) compared to the base grease, with its wear surface remaining free of pronounced groove scratches. KGOM forms a protective film composed of iron, magnesium, silicon, and oxygen on the friction surface, effectively reducing friction and wear while enhancing the electrical conductivity of the worn surface. This study presents a simple and efficient method for producing high-temperature lubricating grease, offering significant potential for advancing new lubrication technologies.</p>

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High-Temperature Friction Behavior of Graphene Oxide/Magnesium Oxide Composites Modified by Silane Coupling Agent

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Liqiang Wang,
  • Shuheng Chi,
  • Lijie He,
  • Lifu Sun,
  • Xiaohang Zhu,
  • Shengchuan Shi

摘要

Extreme conditions, such as elevated temperatures and heavy loads, pose significant challenges to grease performance, resulting in increased friction and wear due to reduced lubrication effectiveness. To address this issue, this study presents the synthesis of graphene oxide/magnesium oxide (GO-MgO, GOM) composites using the REDOX method, followed by modification with a silane coupling agent. The modified graphene oxide/magnesium oxide (KH-GO-MgO, KGOM) composites were prepared through high-energy ball milling. The lubrication properties of GOM and KGOM in base grease under high temperatures and heavy loads were evaluated using an SRV-4 friction and wear testing machine. The experimental results showed that lubricants containing a 0.5% mass fraction of GOM and KGOM exhibited lower and more stable friction coefficients compared to the base grease, demonstrating improved high-temperature lubrication and thermal stability. Notably, KGOM displayed enhanced anti-friction and anti-wear properties. At 175 °C and a load of 150 N, the wear width and maximum depth for the base grease were 455.6 and 13.4 μm, respectively, indicating significant wear. Even under high-temperature conditions, KGOM grease exhibited a narrower wear width (402.9 μm) and maximum depth (9.1 μm) compared to the base grease, with its wear surface remaining free of pronounced groove scratches. KGOM forms a protective film composed of iron, magnesium, silicon, and oxygen on the friction surface, effectively reducing friction and wear while enhancing the electrical conductivity of the worn surface. This study presents a simple and efficient method for producing high-temperature lubricating grease, offering significant potential for advancing new lubrication technologies.