Buslovich Dmitry G, Panin Sergey V, Luo Jiangkun, Pogosyan Ksenya N, Alexenko Vladislav O, Kornienko Lyudmila A
Laboratory of Nanobioengineering, Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia.
Laboratory of Mechanics of Polymer Composite Materials, Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia.
Polymers (Basel). 2023 Jul 31;15(15):3266. doi: 10.3390/polym15153266.
This paper addresses peculiarities in the formation and adherence of a tribofilm on the wear track surface of antifriction PI- and PEI-based composites, as well as a transfer film (TF) on a steel counterface. It is shown that during hot pressing, PTFE nanoparticles melted and coalesced into micron-sized porous inclusions. In the PEI matrix, their dimensions were much larger (up to 30 µm) compared to those in the PI matrix (up to 6 µm). The phenomenon eliminated their role as effective uniformly distributed nanofillers, and the content of 5 wt.% was not always sufficient for the formation of a tribofilm or a significant decrease in the WR values. At the loaded content, the role of MoS and graphite (Gr) microparticles was similar, although filling with MoS microparticles more successfully solved the problem of adhering to a PTFE-containing tribofilm in the point tribological contact. This differed under the linear tribological contact. The higher roughness of the steel counterpart, as well as the larger area of its sliding surface with the same PTFE content in the three-component PI- and PEI-based composites, did not allow for a strong adherence of either the stable PTFE-containing tribofilm on the wear track surface or the TF on the steel counterpart. For the PEI-based composites, the inability to shield the steel counterpart from the more reactive polymer matrix, especially under the conditions of PTFE deficiency, was accompanied by multiple increases in the WR values, which were several times greater than that of neat PEI.
本文探讨了减摩聚酰亚胺（PI）基和聚醚酰亚胺（PEI）基复合材料磨损轨迹表面摩擦膜的形成与附着特性，以及钢对偶面上转移膜（TF）的相关特性。结果表明，在热压过程中，聚四氟乙烯（PTFE）纳米颗粒熔化并聚结成微米级的多孔夹杂物。在PEI基体中，它们的尺寸比PI基体中的尺寸大得多（可达30 µm），而PI基体中的尺寸可达6 µm。这种现象消除了它们作为有效均匀分布纳米填料的作用，5 wt.%的含量并不总是足以形成摩擦膜或显著降低磨损率（WR）值。在负载含量下，二硫化钼（MoS）和石墨（Gr）微粒的作用相似，尽管填充MoS微粒更成功地解决了点接触摩擦学中含PTFE摩擦膜的附着问题。在直线接触摩擦学中情况有所不同。钢对偶面较高的粗糙度，以及在三元PI基和PEI基复合材料中具有相同PTFE含量时其较大的滑动表面积，使得磨损轨迹表面稳定的含PTFE摩擦膜或钢对偶面上的转移膜都无法牢固附着。对于PEI基复合材料，无法使钢对偶面免受更具反应性的聚合物基体的影响，特别是在PTFE缺乏的情况下，伴随着WR值的多次增加，其比纯PEI的WR值大几倍。
