CUTTING TOOL MADE OF HARD SINTERED MATERIAL COATED WITH ARTIFICIAL DIAMOND, EXCELLENT IN CHIPPING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool made of hard sintered material coated with artificial diamond, excellent in chipping resistance. ;SOLUTION: This cutting tool is constituted by forming an artificial diamond film on the surface of a base material of hard sintered material consisting of any of a base material of tungsten-carbide-base cemented carbide, a base material of titanium carbonitride cermet, and a base material of silicon nitride ceramics to 5-200 μm average layer thickness. At this time, the artificial diamond film has, from the observation on the longitudinal section under a scanning electron microscope, a mixed structure of a laminated grain where a thin diamond crystal layer and a thin amorphous carbon layer are alternately laminated at fine pitches to form a striped pattern and a diamond crystal grain, and the laminated grain comprises 10-70 area % of the mixed structure.;COPYRIGHT: (C)1999,JPO