Patent ID: 9249515
Filing Date: 2016-02-02
CPC Classification: C23C,Y10T

Claim Text:
1. Cutting tool including a substrate of hard metal carbide, cermet, steel or high-speed steel (HSS) and a multi-layer coating deposited thereon by a PVD process, wherein starting from the substrate the multi-layer coating comprises the following sequence of layers: a) a base layer consisting of one or more identical or different layers arranged one on top of another of a nitride or carbonitride and which contains at least aluminium (Al) and optionally one or more further metals selected from Ti, Cr, Si, Y, Ru and Mo, b) an intermediate layer arranged on top of the base layer and consisting of one or more oxides or oxynitrides of the metals Al, Cr, Si, and/or Zr, the intermediate layer exhibiting a cubic structure and a coating thickness of from 1 nm to 750 nm, and c) a chromium-containing functional layer arranged on top of the intermediate layer and selected from chromium oxide (Cr