Patent ID: 7763346
Filing Date: 2010-07-27
Classification: C23C,Y10T

Abstract:
1. A surface coated cermet cutting tool comprising: a tool body made of tungsten carbide based hardmetal or a titanium carbonitride based cermet, and a hard coating layer vapor deposited on the surface of the tool body, the hard coating layer having: wherein each of the crystal grain boundary units denotes a grain boundary between two adjacent crystal grains, and the crystal grain boundary orientation of the upper layer is determined using a field emission type scanning electron microscope and an electron-backscattered diffraction pattern imaging device by a method comprising; irradiating an electron beam on each of crystal grains having a hexagonal crystal lattice in a measurement region on a polished surface; performing a measurement of an intersection angle of normal of each of crystal faces subtending to a normal of the polished surface; selecting (0001) planes and {10-10} of each crystals based on the measurement; and determining an intersection angle between normals of (0001) planes and an intersection angle between normals of {10-10} planes at each of the crystal grain boundary units.