【摘要】 以1-己基-3-甲基咪唑六氟磷酸盐离子液体为基础油,考察了不同形态二硫化钼(Mo S2)微粒的摩擦学性能.低载低速下,空心球形Mo S2(空心球)与片状纳米Mo S2(纳米片)均能改善基础油的减摩抗磨性能,片状微米Mo S2(微米片)不仅不具备减摩性能,还会增加磨损;高载高速下,空心球仍保持着较好的减摩抗磨性能,微米片也表现出一定的减摩抗磨能力,而纳米片易导致润滑失效.纯离子液体润滑时钢球表面出现了一定的疲劳磨损,添加空心球与纳米片后,疲劳磨损消失,磨损量下降.空心球与纳米片润滑时,Mo S2能转移到摩擦表面,少部分仍以Mo S2形式存在,其余Mo S2与基础油及摩擦副材料等发生摩擦化学反应,形成由Mo O3、Mo S2、Fe PO4、Fe SO4、Fe F2及含N与S的有机物组成的复合润滑膜;微米片润滑时,很少Mo S2参与了转移膜的形成,因而对基础油改性效果较差.更多还原

【Abstract】 Tribological properties of MoS 2lubricants with different morphologies were investigated in an ionic liquid of 1-hexyl- 3- methylimidazolium hexafluorophosphate. Both MoS 2hollow spheres and nano- platelets improved the friction reduction and wear resistance of ionic liquid under relatively low loads and sliding velocities. However,MoS 2micro-platelets had less effect on the friction reduction and even slightly weakened the anti- wear capability of ionic liquid. When the load and sliding velocity was increased to a great extent,the hollow spheres still showed good properties in friction reduction and wear resistance,whereas the nano- platelets accelerated the lubrication failure of ionic liquid. MoS 2micro-platelets slightly improved the friction reduction and wear resistance of ionic liquid under relatively high load and sliding velocity. Fatigue wear occurred on steel balls lubricated by the pure ionic liquid. When the nano- platelets or the hollow spheres were added into the ionic liquid,the fatigue wear was absent from the steel balls. The MoS 2lubricants weretransferred to the friction surface lubricated with hollow spheres and nano- platelets. Small amount of MoS 2still remained on the friction surface,whereas so much MoS 2was transformed into MoO 3after tribochemical reactions. A lubricating film,containing MoO 3,MoS 2,FeF 2,FeP O3,FeS O4,and N,S- containing organic compounds,was formed on the friction surface by the tribochemical reactions among MoS 2,friction materials and base oil. However,MoS 2micro- platelets didn’t enagaged in the formation of lubricating film,and thus,did not show good tribological properties.更多还原