SLIDING SYSTEM

To provide a sliding system which can reduce a time to attain stabilized low friction and can obtain an excellent frictional property irrespective of types of molybdenum additives.SOLUTION: A sliding system comprises: a first sliding member 10 and a second sliding member 20 which can move relatively to each other; and a lubricating oil 30 which is interposed between the members and contains a molybdenum additive. A sliding surface of the first sliding member 10 is composed of a first sliding coating film 12 including nitride having cubic crystal structure. An area ratio of a (111) plane to a (200) plane of crystal faces of the nitride having cubic crystal structure as measured with X-ray diffraction is 0.85 or more. A sliding surface of the second sliding member 20 is composed of a second sliding material including an iron constituent. Sliding causes iron of the second sliding member 20 to transfer onto the first sliding coating film 12, where the iron reacts with the molybdenum additive to form an intermediate layer of Fe3O4 on which a low frictional MoS2 surface layer is then formed.SELECTED DRAWING: Figure 1 【課題】安定した低摩擦化までの時間を低減することができ、かつ、モリブデン系添加剤のタイプによらず優れた摩擦特性を得ることができる摺動システムを提供する。【解決手段】相対移動し得る第１摺動部材１０及び第２摺動部材２０と、これらの間に介在しモリブデン系添加剤を含有する潤滑油３０とを備える。第１摺動部材１０の摺動面は立方晶構造を持つ窒化物を含む第１摺動被覆膜１２よりなり、Ｘ線回折で測定される立方晶構造を持つ窒化物の結晶面のうち、（２００）面に対する（１１１）面の面積比率が０．８５以上である。第２摺動部材２０の摺動面は、組成として鉄を含む第２摺動材料よりなる。摺動により、第１摺動被覆膜１２の上に第２摺動部材２０の鉄が移着し、モリブデン系添加剤と反応してＦｅ３Ｏ４の中間層が形成され、その上に、低摩擦のＭｏＳ２表面層が形成される。【選択図】図１