CUTTING EDGE OF CUBIC BORON NITRIDE-BASED SINTERED MATERIAL CUTTER HAVING EXCELLENT CHIPPING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a cutting edge of a c-BN-based sintered material cutter having excellent chipping resistance.;SOLUTION: This cutting edge of the cutting tool is formed with a c-BN- based sintered material showing a structure in which an intermediate phase comprising Ti-Al-W-based boron carbonitride is provided between a hard diffusion phase having c-BN and a continuous binding phase having Ti carbonitride by the observation of structure with a scanning electron microscope and having, by area.%, a composition formed of 50 to 70% of the hard diffusion phase, 5 to 15% of the intermediate phase, and the remaining of the continuous binding phase and unavoidable impurities.;COPYRIGHT: (C)2002,JPO