Patent ID: 8603617
Filing Date: 2013-12-10
Classification: C23C,Y10T

Abstract:
1. A cutting tool comprising a base body and a multi-layer coating applied thereto, which, possibly besides further layers, includes a plurality of main layers A and intermediate layers B applied alternately directly one upon the other, wherein the main layers A and the intermediate layers B are respectively metal oxide layers produced by the PVD process, the thickness of the main layers A is in the range of 4 nm to 1 μm, and the thickness of the intermediate layers B is in the range of 2 nm to 50 nm, wherein the ratio of the thicknesses of the intermediate layers B to the thickness of the main layers A is in the range of 1:2 to 1:100 and wherein within a main layer A the proportion of metal oxide in crystalline form decreases over the total thickness of the respective main layer A in the direction from the substrate outwardly from a proportion in the range of 100 to 90% by volume of crystalline metal oxide to a proportion of at least 80% by volume of crystalline metal oxide.