| 摘要 |
<p>The present invention relates to a cutting tool insert comprising a body of a hard alloy of cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel a hard and wear resistant coating, comprising one or several layers, at least one of which an (Al,Cr) 2 O 3 layer is applied. This invention is particularly useful for machining of cast iron. The coating, with a total thickness of 2-20 µm comprises one or several layers, at least one of which is an (Al,Cr) 2 O 3 layer with a thickness of 1-5 µm having a corundum phase crystalline structure and a composition (Al 1-y Cr y ) 2 O 3 with 0.4‰¤y‰¤0.6. The (Al,Cr) 2 O 3 layer is further characterized having a fiber texture with rotational symmetry in the direction of the coated surface normal with an inclination angle, Õ, of the basal planes relative to the coated surface normal or the inclination angle, Õ, for the highest peak in the pole plot with 40° < Õ < 70° as determined by, e.g., electron back scattering diffraction (EBSD) or x-ray diffraction (XRD).</p> |
