State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
J Colloid Interface Sci. 2017 Nov 15;506:415-428. doi: 10.1016/j.jcis.2017.07.070. Epub 2017 Jul 20.
Tribological behaviors of various polyimide (PI) composites when rubbing with medium carbon steel (MCS35) and NiCrBSi, were comprehensively investigated. When the conventional PI composite filled with carbon fibers and graphite was concerned, the carbon-based tribofilm formed on NiCrBSi surface resulted in obvious friction- and wear-reduction. However, no lubricating tribofilm was formed on MCS35 surface. Chelation of polymeric molecular radicals with the metallic counterparts was identified on the worn surfaces. Theoretical calculations corroborated that the Ni-based metal-organic compound showed a higher stability than the Fe-based one. With respect to the sliding of the hybrid nanocomposites containing silica or h-BN nanoparticles, the nanoparticles released onto the interface significantly mitigated tribo-oxidation of metallic counterparts, and were finally tribo-sintered into a compact layer after being mixed with remnant polymer and tribo-oxidation products. The effect of counterpart material was less pronounced for the tribological mechanisms of the nanocomposites than for the conventional composite.
综合研究了与中碳钢（MCS35）和 NiCrBSi 摩擦时各种聚酰亚胺（PI）复合材料的摩擦学性能。对于填充碳纤维和石墨的常规 PI 复合材料，NiCrBSi 表面形成的碳基摩擦膜导致明显的减摩和耐磨。然而，在 MCS35 表面没有形成润滑摩擦膜。在磨损表面上鉴定到聚合分子自由基与金属对应物的螯合。理论计算证实，与 Fe 基相比，Ni 基金属有机化合物表现出更高的稳定性。对于含有二氧化硅或 h-BN 纳米粒子的混合纳米复合材料的滑动，释放到界面上的纳米粒子显著减轻了金属对应物的摩擦氧化，并在与残余聚合物和摩擦氧化产物混合后最终摩擦烧结成致密层。对于纳米复合材料的摩擦学机制，与常规复合材料相比，对偶材料的影响不太明显。
