組成の異なるDLC膜のトライボロジー特性

抄録

Recently, reducing mechanical friction loss of automotive vehicle has proceeded for countermeasures against global warming. Therefore, it is required that tribological properties of automotive sliding parts are improved. DLC (diamond-like carbon) film has excellent tribological properties; therefore, it has begun to be applied there. DLC film has different tribological properties depending on its composition. In this work, we investigated the influence of composition in DLC film on tribological properties by performing ring-on-plate tribotests with three DLC films which have different composition. As a result, DLC film with a layer on the outermost surface with predominantly sp² bonds was superior in running-in behavior and wear resistance to DLC film with predominantly sp³ bonds. After seizure test, structure of DLC film with a layer on the outermost surface with predominantly sp² bonds observed by Raman spectroscopy in wear track remained a layer with predominantly sp² bonds. Hydrogen content did not affect to friction coefficient under high load.