钼酸盐离子液体的合成及其摩擦性能

Synthesis of Molybdate Ionic Liquide and Its Tribological Performance

摘要:

以甲基三辛基氯化铵、钼酸钠、硝酸银为初始原料，合成了甲基三辛基钼酸铵室温离子液体，并通过红外光谱、核磁氢谱、质谱、元素分析对其结构进行了表征。利用热重分析仪、四球摩擦磨损试验机、扫描电镜（SEM）和能谱仪（EDS）考察了其热稳定性能和润滑性能，并初步探讨了甲基三辛基钼酸铵在400SN基础油中的润滑机理。研究结果表明：添加0.5％（质量浓度）钼离子液体能提高基础油抗烧结性能一个等级，提高PB值23.8%，降低磨斑直径34.6%。润滑性能的提升可能是由于钼离子液体在钢球表面发生了化学反应，形成了以钼的氧化物和铁的氧化物为主的化学沉积膜。

Abstract:

Metal-based room-temperature ionic liquid methyltri-n-octylammoniummolybdate ( [(CH3)N(n-C8H17)3]2MoO4 ) was synthesized with methyltri-n-octylammoniumchloride, sodium molybdate dihydrate and silver nitrate, and characterized by FT-IR, 1H NMR, API-ES-MS and elemental analysis, which have been extended to new families and generations of functionalized ILs. Its tribological performances as additive in base oil 400SN were examined on a four-ball tester. Adding 0.5% (mass concentration) molybdenum ionic liquid in base oil 400SN improved the PD value of base oil one lever, increased the PB value by 23.8% and dropped WSD by 34.6%. The tribofilm [(CH3)N(n-C8H17)3]2MoO4 generated on the worn surface was analyzed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The results showed that [(CH3)N(n-C8H17)3]2MoO4 blend oil exhibited excellent anti-wear ability and extreme-pressure performance, which could be attributed to tribo-chemically boundary films formed on the rubbing surface consist of MoOx and FeOx.