Lubrication failure accompanying with blackening phenomenon significantly reduces the long-running operational reliability of porous polymide (PPI) lubricated with poly-α-olefin (PAO) oil. Here, the effects of lubrication condition and counter-surface chemistry on the blackening failure of PAO impregnated PPI were studied through the comparison of the tribological tests against GCr15 steel ball and Al₂O₃ ceramic ball with and without PAO oil lubrication. Black products were found to be formed on the PAO impregnated PPI surface slid against steel ball or Al₂O₃ ball added with iron nano-particles, but be absent under the conditions without iron or PAO oil. Further analysis indicated that the iron-catalyzed splitting of PAO oil into small molecule alkanes and following the formation of black organic matter should be mainly responsible for the blackening phenomenon. Molecular dynamic (MD) simulations demonstrated that the iron facilitated the separation of hydrogen atom and the following broken of C-C bonds in PAO molecules, final resulting in the splitting of PAO oil.

伴随发黑现象的润滑故障显着降低了聚α-烯烃（PAO）油润滑的多孔聚酰亚胺（PPI）的长期运行可靠性。本文通过比较有和无PAO油润滑的GCr15钢球和Al ₂ O ₃陶瓷球的摩擦学试验，研究了润滑条件和配合面化学对PAO浸渍PPI发黑失效的影响。发现PAO浸渍的PPI表面与添加铁纳米颗粒的钢球或Al ₂ O ₃球滑动时形成黑色产物，但在没有铁或PAO油的条件下则不存在黑色产物。进一步分析表明，铁催化PAO油裂解成小分子烷烃并形成黑色有机物应该是造成黑化现象的主要原因。分子动力学（MD）模拟表明，铁促进了PAO分子中氢原子的分离以及随之而来的CC键的断裂，最终导致PAO油的裂解。