Patent ID: 8709583

Claim:
A cutting tool comprising a main body and a multi-layer coating applied thereto, wherein the main body comprises a hard metal which includes 5 to 8% by weight of Co, 0 to 2% by weight of TaC, 0 to 1% by weight of NbC and 89 to 95% by weight of WC with a mean grain size of 1 to 5 μm, and the coating has a first layer of TiAlN having a layer thickness of 1 to 5 μm, and a second layer of aluminium oxide having a layer thickness of 1 to 4 μm, and the coating further additionally includes on the second layer of aluminium oxide n alternately mutually superposedly applied layers of TiAlN and layers of aluminium oxide respectively having a layer thickness of 0.1 to 0.5 μm, wherein n relates to each individual layer and is an even number of 0 to 10, and further optionally has an outer layer ZrN having a layer thickness of 0.1 to 1 μm, wherein the total layer thickness of the coating is 2 to 16 μm and the coating is produced in a PVD process.