ISSN   1004-0595

CN  62-1095/O4

高级检索
张欢欢, 雷雪, 张春丽, 宋宁宁, 张玉娟, 张晟卯. 氧化铈纳米添加剂与商用添加剂的共吸附行为及其协同润滑机制研究[J]. 摩擦学学报, 2023, 43(10): 1201-1211. DOI: 10.16078/j.tribology.2022179
引用本文: 张欢欢, 雷雪, 张春丽, 宋宁宁, 张玉娟, 张晟卯. 氧化铈纳米添加剂与商用添加剂的共吸附行为及其协同润滑机制研究[J]. 摩擦学学报, 2023, 43(10): 1201-1211. DOI: 10.16078/j.tribology.2022179
ZHANG Huanhuan, LEI Xue, ZHANG Chunli, SONG Ningning, ZHANG Yujuan, ZHANG Shengmao. Co-Adsorption Behavior and Synergistic Lubrication Mechanism of Cerium Oxide Nano-Additive and Commercial Additive[J]. TRIBOLOGY, 2023, 43(10): 1201-1211. DOI: 10.16078/j.tribology.2022179
Citation: ZHANG Huanhuan, LEI Xue, ZHANG Chunli, SONG Ningning, ZHANG Yujuan, ZHANG Shengmao. Co-Adsorption Behavior and Synergistic Lubrication Mechanism of Cerium Oxide Nano-Additive and Commercial Additive[J]. TRIBOLOGY, 2023, 43(10): 1201-1211. DOI: 10.16078/j.tribology.2022179

氧化铈纳米添加剂与商用添加剂的共吸附行为及其协同润滑机制研究

Co-Adsorption Behavior and Synergistic Lubrication Mechanism of Cerium Oxide Nano-Additive and Commercial Additive

  • 摘要: 纳米添加剂因其高效的减摩抗磨效应在节能内燃机油中具有广阔的应用前景,与内燃机油中商用添加剂的协效机制是开发纳米添加剂内燃机油配方的关键问题. 本文中利用石英晶体微天平(QCM-D)研究油胺修饰CeO2纳米微粒与商用内燃机油添加剂在金属表面的协同吸附行为,及其对CeO2纳米添加剂减摩抗磨性能的影响机制. 发现清净剂(DE)、减摩剂(FM)、抗氧剂(AO)和黏指剂(VII)都可以同CeO2纳米微粒共同形成摩擦膜,使抗磨性能优于单一添加剂,表现出了协同效应. CeO2纳米微粒与有机分子添加剂复配的抗磨性能与其吸附层的吸附质量成正比. 对于趋近于单层刚性吸附的添加剂,随分子中烷基链长度的增大,CeO2纳米微粒参与共吸附的程度逐渐降低. 分散剂中的长烷基链PIB (聚异丁烯)部分阻碍了CeO2纳米微粒的吸附,使其无法在摩擦副表面沉积成膜,导致了显著的拮抗效应.

     

    Abstract: There is also a growing need for internal combustion engines to improve fuel efficiency and reduce polluting emissions in the fight against global climate change. Efficient supercharging, antifriction coating, low viscosity lubricating oil and other energy saving technologies have appeared. The requirements of higher mechanical stress, higher speed and higher operating temperature in the new technology make it difficult for existing commercial internal combustion engine oil additives to meet. Nano additives have a broad application prospect in energy saving engine oils due to their high anti-wear and anti-friction effects. The co-effect mechanism between nano additives and commercial additives in engine oils is a key issue in developing the formula of nano additive engine oils. Quartz crystal microbalance (QCM-D) was used to study the synergistic adsorption behavior of oleylamine modified CeO2 nanoparticles and commercial engine oil additives on metal surfaces, and the effect mechanism on anti-friction and anti-wear properties of CeO2 nanoparticles. It was found that the formation of dense CeO2 friction film on the surface of the friction pair by CeO2 nanoparticles is the fundamental mechanism to achieve antifriction and anti-wear properties. When CeO2 nanoparticles are mixed with commercial internal combustion engine oil additives, Dispersant (AD) interferes with the formation of CeO2 friction film, resulting in its antifriction and antiwear properties lower than that of a single additive, showing an antagonistic effect. Other additives, such as Detergent (DE), Friction Modifier (FM), Antioxidant (AO) and Viscosity Index Improver (VII), can form friction films together with CeO2 nanoparticles, making the anti-wear performance better than that of a single additive, showing a synergistic effect. Both CeO2 nanoparticles and the involved commercial additives are able to co-adsorb on metal surfaces. For Viscosity Index Improver (VII), Antioxidant (AO), Detergent (DE) and Dispersants (AD), the degree of co-adsorption of CeO2 nanoparticles decreased with the increase of alkyl chain length in the additive. The polyisobutene (FIB) with molecular weight of 1300 in the Dispersant (AD) molecule greatly hindered the adsorption of CeO2 nanoparticles, which could not be deposited on the surface of the friction pair to form a film, leading to a significant antagonistic effect. For the multi-layer viscoelastic adsorption of Friction Modifier (FM), the adsorption of CeO2 nanoparticles on the metal surface increased significantly, resulting in the maximum adsorption mass. The wear resistance of CeO2 nanoparticles combined with organic molecular additives is proportional to the adsorption mass of the adsorption layer. The combination with the Friction Modifier (FM) has the maximum adsorption mass and the smallest diameter of the grinding spot. The combination with Dispersant (AD) has the lowest adsorption quality, resulting in the grinding diameter of AD is larger than that of other additives. The friction film formed by the Detergent (DE) with inorganic nuclei and CeO2 nanoparticles has stronger anti-wear ability than the single CeO2 friction film.

     

/

返回文章
返回