| abstract |
Tool comprising a base body made of hard metal, cermet, ceramics, steel or high-speed steel and a single-layer or multi-layer anti-wear protective coating applied thereon in the PVD process, at least one layer of said anti-wear protective coating being a titanium-aluminium-nitride layer, Ti x Al y N where x+y=1, which layer can contain, according to the process, up to 5% by weight of further metals, characterised in that the Ti x Al y N layer is a multi-coat substructure having a plurality of periodically alternating Ti x(A) Al y(A) N coats (A) where x(A)+y(A)=1 and Ti x(B) Al y(B) N coats (B) where x(B)+y(B)=1, the Al concentration y(B) in coats (B) amounting at most to 70 at. % (y(B) 0.70) and the Al concentration y(B) in coats (B) being from 10 to 25 at. % higher than the Al concentration y(A) in coats (A) (y(B)=(y(A)+0.10) to (y(A)+0.25)). |