CUTTING TOOL HAVING SURFACE COATED WITH HARD LAYER
摘要
<p>Disclosed is a cutting tool which comprises: a base material comprising a tungsten carbide-based super-hard alloy or a titanium carbo-nitride-based cermet; and (a) an Al-Ti composite nitride layer which has an average layer thickness of 0.5 to 5 µm and which fulfils the following formula: (Al1-XTiX)N [wherein X fulfils the following formula: 0.3=X=0.7 in terms of atomic ratio] as a lower layer, (b) an Al-Cr composite nitride layer which has an average layer thickness of 0.5 to 5 µm and which fulfils the following formula: (Al1-aCra)N [wherein a fulfils the following formula: 0.2=a=0.6 in terms of atomic ratio] as an intermediate layer, and (c) an Al-Ti composite nitride layer which has an average layer thickness of 0.2 to 0.6 µm and which fulfils the following formula: (Al1-XTiX)N [wherein X fulfils the following formula: 0.3=X=0.7 in terms of atomic ratio] as an upper layer, all of which are arranged on the surface of the base material.</p>
