SURFACE COATED CERMET CUTTING TOOL WITH THICKENED alpha TYPE ALUMINUM OXIDE LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cermet cutting tool with a thickenedαtype Al2O3layer exhibiting excellent chipping resistance. SOLUTION: This surface coated cermet cutting tool is formed by depositing on the tool base body surface composed of the WC base cemented carbide or TiCN base cermet (a) an adhesive Ti compound layer made of one layer or two layers or more chemically deposited and having total average layer thickness of 0.1 to 2μm, (b) a modified TiCN layer chemically deposited and formed in average layer thickness of 1 to 10μm wherein an inclination made by a normal of a ä112} surface which is a crystal plane of crystal grains shows a specific inclination angle frequency distribution graph against a normal of a surface polishing surface by irradiating each of the crystal grains having a cubic system crystal lattice existing in a measuring range of the surface polishing surface with electron beam by using a field emission type scanning electronic microscope and (c) depositing and forming the thickenedαtype Al2O3layer having average layer thickness of 16 to 30μm through the close adhesive Ti compound layer and the modified TiCN layer of (a) and (b). COPYRIGHT: (C)2007,JPO&INPIT