Abstract A new kind of PTFE composite with self-contained solid-liquid synergetic lubricating effect is prepared by the combination of PTFE, porous diatomite (DE), and immersed lubricating oil (ATF6). The tribological and mechanical properties of composites with different DE contents and varying cold-pressed pressures were investigated systematically. Due to the oil storage effect of DE particles, the maximum oil content of PTFE/DE composite is 16.4 wt%. With the increase of DE content, the surface hardness, elastic modulus and yield strength can be increased from 3.2 to 3.6 HV, 37.8–60.2 MPa and 8.7 MPa–12.8 MPa, respectively. With the addition of DE, the wear rate of PTFE decreases but the coefficient of friction (COF) increases. Meanwhile, with the addition of DE and ATF6, both the COF and wear rate of PTFE decrease. The COF can be reduced by 68% from 0.121 (specimen 0%-10 MPa-dry) to the minimum value of 0.039 (composite 10%-10 MPa-ATF6), and the wear rate can be reduced by 82% from 1.95 × 10−4 mm/Nm (0%-50 MPa-dry) to the minimum value of 0.35 × 10−4 mm/Nm (10%-50 MPa-ATF6). The enhanced antifriction performance of the composite PTFE/DE/ATF6 is contributed by the synergistic lubricating effect of self-contained liquid lubricant of ATF6 and the solid lubricant of PTFE. The prepared PTFE/DE/ATF6 composites exhibit excellent tribological performance as well as the mechanical properties, which can be used to fabricate a new kind of self-lubricating materials with high performance and long durability.

中文翻译：

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具有自含固液协同润滑性能的PTFE/DE/ATF6复合材料的制备及摩擦学性能

摘要 将聚四氟乙烯、多孔硅藻土（DE）和浸入式润滑油（ATF6）结合，制备了一种具有自含固液协同润滑作用的新型聚四氟乙烯复合材料。系统地研究了具有不同 DE 含量和不同冷压压力的复合材料的摩擦学和机械性能。由于DE颗粒的储油作用，PTFE/DE复合材料的最大含油量为16.4 wt%。随着DE含量的增加，表面硬度、弹性模量和屈服强度可分别从3.2 HV增加到3.6 HV、37.8-60.2 MPa和8.7 MPa-12.8 MPa。随着DE的加入，PTFE的磨损率降低，但摩擦系数（COF）增加。同时，随着DE和ATF6的加入，PTFE的COF和磨损率均降低。COF由0.121（试样0%-10MPa-dry）降低68%至最小值0.039（复合10%-10MPa-ATF6），磨损率由1.95×降低82% 10-4 mm/Nm (0%-50 MPa-dry) 到最小值 0.35 × 10-4 mm/Nm (10%-50 MPa-ATF6)。PTFE/DE/ATF6复合材料的减摩性能增强是由于ATF6自含液体润滑剂和PTFE固体润滑剂的协同润滑作用。制备的 PTFE/DE/ATF6 复合材料具有优异的摩擦学性能和机械性能，可用于制备高性能、长寿命的新型自润滑材料。95 × 10−4 mm/Nm (0%-50 MPa-dry) 到最小值 0.35 × 10−4 mm/Nm (10%-50 MPa-ATF6)。PTFE/DE/ATF6复合材料的减摩性能增强是由于ATF6自含液体润滑剂和PTFE固体润滑剂的协同润滑作用。制备的 PTFE/DE/ATF6 复合材料具有优异的摩擦学性能和机械性能，可用于制备高性能、长寿命的新型自润滑材料。95 × 10−4 mm/Nm (0%-50 MPa-dry) 到最小值 0.35 × 10−4 mm/Nm (10%-50 MPa-ATF6)。复合 PTFE/DE/ATF6 增强的减摩性能是由于 ATF6 自含液体润滑剂和 PTFE 固体润滑剂的协同润滑作用。制备的 PTFE/DE/ATF6 复合材料具有优异的摩擦学性能和机械性能，可用于制备高性能、长寿命的新型自润滑材料。