COATED CUTTING TOOL INSERT

摘要

The present invention relates to a CVD-coated cutting tool insert with improved toughness properties having the ability to withstand high temperatures without sacrificing edge line security. The insert coating comprises a TiC_xN_y-layer with a low tensile stress level of 50-500 MPa and an a-Al₂0₃ -layer with a high surface smoothness with a mean Ra < 0.12 µm as measured by AFM- technique, obtained by subjecting the coating to an intensive wet blasting operation.