| 摘要 |
The invention concerns a cutting tool comprising a main body and a multi-layer coating applied thereto. To provide improved cutting tools which have increased resistance to comb cracking, tribochemical wear and cratering caused thereby 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 5μm, and the coating has a first layer of TiAlN having a layer thickness of 1 to 5μm, and a second layer of aluminum oxide having a layer thickness of 1 to 4μm, wherein the coating further additionally includes on the second layer of aluminum oxide n alternately mutually superposedly applied layers of TiAlN and layers of aluminum oxide respectively having a layer thickness of 0.1 to 0.5μm, wherein n relates to each individual layer and is an even number of 0 to 10, and wherein the total layer thickness of the coating is 2 to 16μm and the coating is produced in the PVD process. |
