GF/MoS2改性PTFE密封唇片材料的力学及摩擦学性能

采用玻璃纤维(GF)微粉与MoS₂复合改性聚四氟乙烯(PTFE)密封唇片材料，考察复合材料的力学、干摩擦磨损性能及其磨损机理。结果表明:当GF质量分数为15%时，PTFE/GF试样的回弹率达到最大值92.5%，摩擦因数为0.29，相比纯PTFE有所增加，而磨损率大大降低，仅为1.8×10?6mm3/(N·m)；在此基础上，当MoS₂添加量为5%时，PTFE/GF/MoS₂试样的回弹率略有降低，但仍然保持在90%以上，其摩擦因数为0.31，体积磨损率进一步降低到1.25×10?6mm3/(N·m)。磨损面SEM分析表明:纯PTFE呈现出严重的塑性变形和粘着磨损特征，而PTFE/GF主要表现为磨粒磨损行为；适当MoS₂含量的PTFE/GF/MoS₂试样在摩擦过程中磨粒磨损特征消失，仅有非常轻微的粘着磨损行为。

Mechanical and Tribological Properties of Polytetrafluoroethylene Composites Modified by Glass Fiber and MoS2 for Seal Lip Application

The effects of glass fiber micro-powder(GF) and its compounds with molybdenum disulfide(MoS₂) on mechanical, friction & wear properties under dry sliding condition and wear mechanisms of polytetrafluoroethylene(PTFE) composites for seal lip application were investigated. The results show that the stretch resilience ratio reaches the maximum value of 92.5% and the friction coefficient increases to 0.29 compared with pure PTFE, while the wear rate decreases greatly, which was only 1.8×10?6mm3/ (N·m) for PTFE/GF specimens with 15% GF by weight. Based on this, the stretch resilience ratio of PTFE/GF/MoS₂?specimen with 5% MoS₂?decreases slightly, but still remains above 90%, its friction coefficient is 0.31 and volumetric wear rate further is reduced to 1.25×10?6mm3/(N·m). SEM analysis for worn surfaces indicated that pure PTFE presented severe plastic deformation and adhesive wear characteristics, while PTFE/GF mainly presented abrasive wear behavior. The PTFE/GF/MoS₂?specimen with appropriate MoS₂?content had only a very slight adhesive wear behavior during the friction process, its abrasive wear characteristic disappeared.