SURFACE COATED CUTTING TOOL WITH HARD COATING LAYER EXHIBITING EXCELLENT ABRASION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool with a hard coating layer exhibiting excellent abrasion resistance under high speed heavy duty cutting of a hard-to-cut material. SOLUTION: This surface coated cutting tool is formed by vapor-depositing (a) a lower layer comprising Ti compound layer, (b) a reinforcing layer comprisingαtype Al2O3layer, when measuring an inclination angle of a normal line of a plane (0001), or a crystal plane of a crystal grain to create an inclination angle frequency-distribution graph, showing the inclination angle frequency-distribution graph which has a highest peak at an inclination angle interval in the range of 75-90°and a frequency rate in the range occupies 50% or more of the total, and (c) an upper layer comprising modifiedαtype Al2O3layer, on the surface of a tool substrate; and a tool cutting face area alone has an outermost layer comprising a titanium oxide layer (a lower side layer) and a titanium-nitride-oxide layer (an upper side layer). COPYRIGHT: (C)2008,JPO&INPIT