PISTON RING HAVING HARD MULTI-LAYER COATING

摘要

A piston ring (22) is covered at least partially with a layered structure (30). The layered structure (30) comprises: - a first intermediate layer (32) comprising at least one element of group IVB, group VB or group VIB; - a second intermediate layer (34) deposited on top of the first intermediate layer (32) and comprising a diamond-like nanocomposite composition; -a diamond-like carbon layer (36) deposited on top of the second intermediate layer (34).