Guo Yonggang, Fang Chenyang, Wang Tingmei, Wang Qihua, Song Fuzhi, Wang Chao
School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China.
State key Labratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Polymers (Basel). 2023 Nov 18;15(22):4454. doi: 10.3390/polym15224454.
In this study, cotton fabric-reinforced phenolic resin (CPF) composites were modified by adding four two-dimensional fillers: graphitic carbon nitride (g-CN), graphite (Gr), molybdenum disulfide (MoS), and hexagonal boron nitride (h-BN). The tribological properties of these modified materials were investigated under dry friction and water lubrication conditions. The CPF/Gr composite exhibits significantly better tribological performance than the other three filler-modified CPF composites under dry friction, with a 24% reduction in friction coefficient and a 78% reduction in wear rate compared to the unmodified CPF composite. Under water lubrication conditions, all four fillers did not significantly alter the friction coefficient of the CPF composites. However, except for an excessive amount of Gr, the other three fillers can reduce the wear rate. Particularly in the case of 10% MoS content, the wear rate decreased by 56%. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were employed for the analysis of the morphology and composition of the transfer films. Additionally, molecular dynamics (MD) simulations were conducted to investigate the adsorption effects of CPF/Gr and CPF/MoS composites on the counterpart surface under both dry friction and water lubrication conditions. The difference in the adsorption capacity of CPF/Gr and CPF/MoS composites on the counterpart, as well as the resulting formation of transfer films, accounts for the variation in tribological behavior between CPF/Gr and CPF/MoS composites. By combining the lubrication properties of MoS and Gr under dry friction and water lubrication conditions and using them as co-fillers, we can achieve a synergistic lubrication effect.
在本研究中，通过添加四种二维填料：石墨相氮化碳（g-CN）、石墨（Gr）、二硫化钼（MoS）和六方氮化硼（h-BN）对棉织物增强酚醛树脂（CPF）复合材料进行了改性。研究了这些改性材料在干摩擦和水润滑条件下的摩擦学性能。在干摩擦条件下，CPF/Gr复合材料的摩擦学性能明显优于其他三种填料改性的CPF复合材料，与未改性的CPF复合材料相比，摩擦系数降低了24%，磨损率降低了78%。在水润滑条件下，所有四种填料均未显著改变CPF复合材料的摩擦系数。然而，除了过量的Gr外，其他三种填料均可降低磨损率。特别是在MoS含量为10%的情况下，磨损率降低了56%。采用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）对转移膜的形态和成分进行了分析。此外，还进行了分子动力学（MD）模拟，以研究CPF/Gr和CPF/MoS复合材料在干摩擦和水润滑条件下对配对表面的吸附作用。CPF/Gr和CPF/MoS复合材料在配对表面吸附能力的差异以及由此形成的转移膜，解释了CPF/Gr和CPF/MoS复合材料之间摩擦学行为的变化。通过结合MoS和Gr在干摩擦和水润滑条件下的润滑性能并将它们用作共填料，可以实现协同润滑效果。
